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BASH scripting Question - Select loop displaying output

Store Output of a Command to an Array

Quote:

Originally Posted by StaffSergeant (Post 4527067)

Catch is I want to limit it to so only 23 files display at a time so no files scroll off.

Here is the solution:

Code:

#!/bin/bash

FILES=($(ls -1))

Total_Files=${#FILES[@]}

Index=0

Count=0

while [ $Index -lt $Total_Files ];do

        [ $Count -eq 20 ] && { read -p 'Press the Enter/Return Key to Continue...';Count=0; }

        echo $Index : ${FILES[$Index]}

        let 'Index++'

        let 'Count++'

done

exit 0

Remove "$Index : " from the line above not to print the line numbers along with the file names:

Code:

echo ${FILES[$Index]}

Some Notes:

Storing the output of "ls -1" (you can use any other command, say "ls -ltr") command to an array:

Code:

FILES=($(ls -1))

Prompting for an input:

Code:

read -p 'Press the Enter/Return Key to Continue...'

The value is stored to $REPLY and we are simply discarding it; and resetting $Count to 0 (zero). Those two statements are inside { } so that we execute them as a group.

Modify the above script to suit your other requirements.

Cheers!

That's a while loop still, I would like it to be a select loop

Quote:

Since you can't use | more

Why not?

| more does not will not work inside a select loop.

The reason I want a select loop is because eventually I will be running another select loop with functions in that. So the first select loop above will choose a file from the list, then the second loop will execute a function within side of that such as delete.

Quote:

Originally Posted by StaffSergeant (Post 4527817)

And you cannot do that with if/while?

To make things more complicated, select will print the options in multiple columns at the slightest provocation:

Code:

$ select file in $(seq 1 20); do echo $file; done

1) 1    3) 3    5) 5    7) 7    9) 9  11) 11  13) 13  15) 15  17) 17  19) 19

2) 2    4) 4    6) 6    8) 8  10) 10  12) 12  14) 14  16) 16  18) 18  20) 20

#?

Have you considered dialog? Something like

Code:

dialog --fselect ./ $height $width # will make a nice dialog to select a file

dialog --menu "Select operation:" $height $width $menu_height \

1 "delete" \

2 "move" \

3 "do something else with the file"

I found a nice short tutorial here

That is what I am working towards something like this:

INPUT1 = $1
INPUT2 = $2
INPUT3 = $3
VAR1 = 0
LENGTH = 0
if [[ INPUT2 == ""]]
then
while [ VAR1 = 0 ];
do
while [ Array.Length > Length ]
do
select VAR1 in Array:Length:Length:+19 "sort name" "sort size" "sort age" "more"
do
case
quit)
exit;;
"sort name") ;;
"sort size") ;;
"sort age") ;;
more) ;;
*)
esac
done
length=legnth+19
done
done
select
do
#commands in a case delete, copy,etc
done

fi

So I want to use the select loops to be able to select an item off the list (a file) then run another select loop and select an item off that list such as delete etc.

http://imgly.net/di-PBW3.jpg

This is what I have so far.

I still don't follow. What is wrong with example given by devUnix? To improve on that, it could look like:

Code:

#!/bin/bash



FILES_PER_SCREEN=20



select_file() {



        # some useful variables

        FILES=($(ls -1)) # breaks if filenames contain spaces

        Total_Files=${#FILES[@]}

        CHOICE1=""



        while [ x"$CHOICE1" = x ]; do

                Index=0

                Count=0



                # print all the files line by line

                while [ $Index -lt $Total_Files ];do



                        # if the screen is full wait for the user to either select a file or continue

                                [ $Count -eq $FILES_PER_SCREEN ] && {

                                      read -p 'Press the Enter/Return Key to Continue...' CHOICE1;

                                      Count=0;



                                # check that the input is an integer

                                [ x"$(echo "$CHOICE1"|tr -d [0-9])" = "x" ] || CHOICE1=""



                                # if the user selected a file, exit loop

                                [ x"$CHOICE1" == "x" ] || break

                        }

                        echo $Index : ${FILES[$Index]}

                        let 'Index++'

                        let 'Count++'

                done

        done



        # store the filename in the variable passed as $1

        eval $1=${FILES[$CHOICE1]}

}



select_file FILENAME

echo "Your choice is: $FILENAME"



select OPERATION in delete move copy; do

        [ "$OPERATION" = "delete" ] && rm "$FILENAME"

        # add the code to be done here...

done

exit 0

There is still a lot to improve. The code devUnix wrote for reading the output of ls will not work as expected, if the filenames contain spaces.

I mean I understand that its easier don't get me wrong. I am just working on an objective where it has to be select loops. I can do it in while loops, it's I am not use to select loops.

We need to prompt the user for a file, then they need to select it, then prompt them for a command to use, and both those need to be select loops. We can nest then in other loops.

sigh. Ok, how about something like this then?

Code:

#!/bin/bash



# let's have an array

declare -a FILES 



# this might be a bit strange way to load those names into an array, but it will probably

# deal with the spaces correctly. I don't know if there's a point to this -- it's like 

# 4am and I haven't got a clue about what I'm doing

for file in *; do FILES+=("$file"); done



# some variables --------------------------------------



# Number of files to print at a time

FILES_PER_SCREEN=20



# Number of files to move up and down when user selects

# "previous" or "next"

STEP=20



# our current position in the list -- index of the

# first filename to display

POS=0



# Total number of files in current directory

FILE_NUMBER=${#FILES[@]}



# index of the last filename to display

ENDPOS=$FILES_PER_SCREEN

[[ ENDPOS -ge FILE_NUMBER ]] && (( ENDPOS=$FILE_NUMBER - 1 ))



# Now let's store the entire array of available files in a string

# If there are files behind $ENDPOS, include the 'next' option

OPTIONS=$(for i in $(seq $POS $ENDPOS); do echo "${FILES[$i]}"; done;

        (( ($ENDPOS + 1) < FILE_NUMBER )) && echo "next")



# To check if the user wants to quit the program

QUIT=FALSE



# to treat only newlines as field separators ( so the names

# containing spaces don't break up

IFS='

'



# Main loop ===========================================

# will run until user chooses to quit

while [ x"$QUIT" = xFALSE ]; do

        clear

        # The outer select loop -------------------------------

        select SELECTED in $OPTIONS; do



                # Move down in the list

                if [ x"$SELECTED" = xnext ]; then

                              (( POS = $POS + $STEP ))

                        (( ENDPOS = $FILES_PER_SCREEN + $POS ))

                        [[ ENDPOS -ge FILE_NUMBER ]] && (( ENDPOS=$FILE_NUMBER - 1 ))

                        OPTIONS=$([ "$POS" -gt 0 ] && echo "previous";  for i in $(seq $POS $ENDPOS); do

                                echo "${FILES[$i]}"; done;

                                (( ($ENDPOS + 1) < FILE_NUMBER )) && echo "next")

                        break

                # Move up in the list

                elif [ x"$SELECTED" = xprevious ]; then

                        if [ "$POS" -le "$STEP" ]; then POS=0;

                        else (( POS = $POS - $STEP )); fi

                        (( ENDPOS = $FILES_PER_SCREEN + $POS ))

                        [[ ENDPOS -ge FILE_NUMBER ]] && (( ENDPOS=$FILE_NUMBER - 1 ))

                        OPTIONS=$([ "$POS" -gt 0 ] && echo "previous";  for i in $(seq $POS $ENDPOS); do

                                echo "${FILES[$i]}"; done;

                                (( ($ENDPOS + 1) < FILE_NUMBER )) && echo "next")

                        break

                elif [ x"$SELECTED" = x ]; then

                        break;



                else

                        # inner select loop ......................................................

                        select OPERATION in delete move quit; do

                                if [ x"$OPERATION" = x ]; then continue

                                elif [ x"$OPERATION" = xdelete ]; then

                                        rm "$SELECTED"

                                elif [ x"$OPERATION" = xquit ]; then exit 0

                                else 

                                        echo "$OPERATION" # code to be executed

                                fi

                        done

                        # end of inner select .....................................................

                fi



        done

        # end of outer select ----------------------------------------------



done

# end of main loop ===============================================

There still is the problem of select using multiple columns sometimes, so there's no easy way to know how many lines will it take. But it shouldn't be more than about 23 as long as there's no line wrapping.
Another problem would be if there happened to be files named "previous" or "next" in the current directory.
But I'll leave that to you to deal with as an exercise :P

I am currently on 2 day order with my Army Unit, havn't had to look at it, just printed it and going to look at it at chow.

Thanks for the help though!

Quote:

Originally Posted by StaffSergeant (Post 4527612)

That's a while loop still, I would like it to be a select loop

Put embed that while loop in your select select statements.

hi friends, hope you are doing well...

Guys I wanna tell you that I have a bash script exercise that I need it to be configured for me to pass my scripting class, but the problem is our teacher is bad as shit and he does nothing more than chucking the sheets on us, and whenever you wanna ask him something he goes like "well you are supposed to figure it out yourself" the issue is we are all lost students, and I am trying my best and I bought all the CBT Nuggets scripting videos, but I cant get nothing for now.. and my exercises should be handed over ssh Putty login to Centos server this week, so guys please help me to just pass my subject, and I will defiantly work on CBT Nuggets Videos to learn more and more, I even still needs to do my job work, I work security but human one, not software lol...

please Guys help me ... i will type the question soon

heaps heap heaps of thanx

engrmilad, please don't hijack other people's threads. In addition, we're not here to do your work for you.

So I have the file working in a function as, is it possible to sort the array as in how next and previous were added, if I wanted to sort by name as a choice as well?

# Start the array.
declare -a FILES

# Load names into the array, while also dealing with the spaces correctly.
for file in *; do FILES+=("$file"); done

# Declare varibles --------------------------------------

# Number of files to show at a time
FILES_PER_SCREEN=21

# Number of files to move up and down when user selects
# "previous" or "next"
STEP=22

# The current position in the list -- index of the first filename to display
POS=0

# Total number of files in current directory
FILE_NUMBER=${#FILES[@]}

# Index of the last filename to display
ENDPOS=$FILES_PER_SCREEN
[[ ENDPOS -ge FILE_NUMBER ]] && (( ENDPOS=$FILE_NUMBER - 1 ))

# Store the entire array of available files in a string
# If there are files $ENDPOS, include the 'next' option
OPTIONS=$(for i in $(seq $POS $ENDPOS); do echo "${FILES[$i]}"; done;
(( ($ENDPOS + 1) < FILE_NUMBER )) && echo "next")

# To check if the user wants to quit the program
QUIT=FALSE

# This will treat only newlines as field separators, so the names containing spaces don't break up.

IFS='
'

# Main loop ===========================================
# will run until user chooses to quit
while [ x"$QUIT" = xFALSE ];
do
clear

# The options select loop -------------------------------
select SELECTED in $OPTIONS;
do
# Move down in the list
if [ x"$SELECTED" = xnext ];
then
(( POS = $POS + $STEP ))
(( ENDPOS = $FILES_PER_SCREEN + $POS ))
[[ ENDPOS -ge FILE_NUMBER ]] && (( ENDPOS=$FILE_NUMBER - 1 ))
OPTIONS=$([ "$POS" -gt 0 ] && echo "previous";

for i in $(seq $POS $ENDPOS);
do
echo "${FILES[$i]}";
done;
(( ($ENDPOS + 1) < FILE_NUMBER )) && echo "next")
break

# Move up in the list
elif [ x"$SELECTED" = xprevious ];
then
if [ "$POS" -le "$STEP" ];
then POS=0;
else (( POS = $POS - $STEP ));
fi

(( ENDPOS = $FILES_PER_SCREEN + $POS ))
[[ ENDPOS -ge FILE_NUMBER ]] && (( ENDPOS=$FILE_NUMBER - 1 ))
OPTIONS=$([ "$POS" -gt 0 ] && echo "previous";

for i in $(seq $POS $ENDPOS);
do
echo "${FILES[$i]}";
done;
(( ($ENDPOS + 1) < FILE_NUMBER )) && echo "next")
break

elif [ x"$SELECTED" = x ];
then
break;

else

# inner select loop ......................................................
select OPERATION in delete move quit;
do
if [ x"$OPERATION" = x ];
then continue
elif [ x"$OPERATION" = xdelete ];
then
rm "$SELECTED"
elif [ x"$OPERATION" = xquit ];
then exit 0
else
echo "$OPERATION" # code to be executed
fi
done
# end of inner select .....................................................
fi
done
# end of outer select ----------------------------------------------
done
# end of main loop ===============================================

Quote:

Originally Posted by StaffSergeant (Post 4530137)

So I have the file working in a function as, is it possible to sort the array as in how next and previous were added, if I wanted to sort by name as a choice as well?

I am not sure what you mean. The files generated by wildcard expansion should already be sorted by name.

By the way, if you post code, you can enclose it in [code] this is my code [/code] tags to preserve indentation

That one yes ( but it does not account for numeric sorting), also what about sorting by age and size, then if we wanted to switch back?

I know sorting for arrays is a cmd substitution cause with age you add the -t to a ls size -s with ls, just don't know how i would implement it.

well the wildcard expansion does not provide info about the size and age of the files, so either you would have to use ls which can sort its output by various criteria, or you would have to get that info by iterating through the array and stating each file. You can add the options to sort the same way as the previous and next entries. Then you would add corresponding code into the select loop to tell the script what to do if the user chooses that option. Basically, it would be enough to just reload the array with

Code:

FILES=($(ls -1))

and a corresponding switch to sort by age/size/modification time or whatever you want.
Note that if there happen to be a file named 'sort by size' etc., you're in trouble.
Also note that sorting by age will probably not work with all filesystems, since some linux filesystems don't store the age of files.

This is what I have managed to get so far. The sorting I had tried to embed into the select loop, but would just be ignored completely.

Code:

#!/bin/bash

# Start the array.

declare -a FILES 



# Load names into the array, while also dealing with the spaces correctly.

for file in *; do FILES+=("$file"); done



# Declare varibles --------------------------------------



# Number of files to show at a time

FILES_PER_SCREEN=21



# Number of files to move up and down when user selects

# "previous" or "next"

STEP=22



# The current position in the list -- index of the first filename to display

POS=0



# Total number of files in current directory

FILE_NUMBER=${#FILES[@]}





# Index of the last filename to display

ENDPOS=$FILES_PER_SCREEN

[[ ENDPOS -ge FILE_NUMBER ]] && (( ENDPOS=$FILE_NUMBER - 1 ))





# Store the entire array of available files in a string

# If there are files $ENDPOS, include the 'next' option

OPTIONS=$(for i in $(seq $POS $ENDPOS); do echo "${FILES[$i]}"; done;

        (( ($ENDPOS + 1) < FILE_NUMBER )) && echo "next")

        



# To check if the user wants to quit the program

QUIT=FALSE



# This will treat only newlines as field separators, so the names containing spaces don't break up.



IFS='

'



# Main loop ===========================================

# will run until user chooses to quit

while [ x"$QUIT" = xFALSE ]; 

        do

        clear

                

        # The options select loop -------------------------------        

        select SELECTED in $OPTIONS; 

                do

                        # Move down in the list

                        if [ x"$SELECTED" = xnext ]; 

                                then

                              (( POS = $POS + $STEP ))

                                (( ENDPOS = $FILES_PER_SCREEN + $POS ))

                                [[ ENDPOS -ge FILE_NUMBER ]] && (( ENDPOS=$FILE_NUMBER - 1 ))

                                OPTIONS=$([ "$POS" -gt 0 ] && echo "previous";  

                

                                for i in $(seq $POS $ENDPOS); 

                                        do

                                                echo "${FILES[$i]}"; 

                                        done;

                                (( ($ENDPOS + 1) < FILE_NUMBER )) && echo "next")

                                break

                        



            # Move up in the list

                        elif [ x"$SELECTED" = xprevious ]; 

                                then

                                        if [ "$POS" -le "$STEP" ];

                                                then POS=0;

                                        else (( POS = $POS - $STEP )); 

                                fi

                        

                        (( ENDPOS = $FILES_PER_SCREEN + $POS ))

                        [[ ENDPOS -ge FILE_NUMBER ]] && (( ENDPOS=$FILE_NUMBER - 1 ))

                        OPTIONS=$([ "$POS" -gt 0 ] && echo "previous";  

                        

                        for i in $(seq $POS $ENDPOS); 

                                do

                    echo "${FILES[$i]}"; 

                                done;

                                (( ($ENDPOS + 1) < FILE_NUMBER )) && echo "next")

                                break

                                

                        elif [ x"$SELECTED" = x ]; 

                                then

                                break;



                        else

          

                  # inner select loop ......................................................

                        select OPERATION in type copy ren del move help copy! del! ren! quit; 

                                do

                                        if [ x"$OPERATION" = x ]; 

                                                then continue

                                        elif [ x"$OPERATION" = xtype ]; 

                                                then

                                                        cat "$SELECTED"

                                        elif [ x"$OPERATION" = xcopy ]; 

                                                then

                                                        echo "Where would like to copy the file to?"

                                                        read INPUTX

                                                        cp $SELECTED $INPUTX

                                        elif [ x"$OPERATION" = xren ]; 

                                                then

                                                        echo "What would you like the new file name to be?"

                                                        read INPUTX

                                                        mv $SELECTED $INPUTX

                                        elif [ x"$OPERATION" = xren ]; 

                                                then

                                                        echo "What would you like the new file name to be?"

                                                        read INPUTX

                                                        mv -f $SELECTED $INPUTX

                                        elif [ x"$OPERATION" = xdel! ]; 

                                                then

                                                        rm -r "$SELECTED"

                                        elif [ x"$OPERATION" = xdel ]; 

                                                then

                                                        rm "$SELECTED"

                                        elif [ x"$OPERATION" = xhelp ]; 

                                                then

                                                        echo "the following are commands, and their outputs for this script."

                                                        echo "type what is in the file"

                                                        echo "copy copys the file to a location"

                                                        echo "copy! forcefully, meaning will not prompt, when coping the file"

                                                        echo "ren will rename the file"

                                                        echo "ren! forcefully, meaning will not prompt, rename a file"

                                                        echo "move used to move a file"

                                                        echo "move! forcefully, meaning will not prompt, to move the file"

                                                        echo "del delete a file"

                                                        echo "del! delete a file forcefully"

                                        elif [ x"$OPERATION" = xmove ]; 

                                                then

                                                        echo "Where would you like to move the file to?"

                                                        read INPUTX

                                                        mv $SELECTED $INPUTX

                                        elif [ x"$OPERATION" = xcopy ]; 

                                                then

                                                        echo "Where would like to copy the file to?"

                                                        read INPUTX

                                                        cp -f $SELECTED $INPUTX

                                        elif [ x"$OPERATION" = xquit ]; 

                                                then exit 0

                                        else 

                                                echo "$OPERATION" # code to be executed

                                        fi

                                done

          # end of inner select .....................................................

                        fi

                done

        # end of outer select ----------------------------------------------

        done

# end of main loop ===============================================

Quote:

Originally Posted by StaffSergeant (Post 4530252)

This is what I have managed to get so far. The sorting I had tried to embed into the select loop, but would just be ignored completely.

I can't see any sorting in your code.
I have made some improvements. I put the code to generate the menu items into a function and added some sorting options. I would not recommend adding too many options into the file selection menu or you may end up having 20 options to sort and the filelist listing 3 files at a time :)

Code:

#!/bin/bash



# generates menu from files in the list and position

# usage: make_select_menu list $pos $num $max_files target

# @param[in] list reference to the array containing the list of the files

# @param[in] $pos position in the list (first file to display)

# @param[in] $num total  number of files in list

# @param[in] $max_lines maximum number of lines to display

# @param[out] target reference to the variable to store the output

# @returns nothing

make_select_menu() {

        local      list="$1"

        local      pos="$2"

        local      num="$3"

        local max_files="$4"

        local    target="$5"

        local    endpos=""

        (( endpos = $pos + $max_files - 1 ))

        [[ $endpos -ge $num ]] && (( endpos= $max_files - 1 ))



        eval $target='"$(

                [ $pos -gt 0 ] && echo "previous"

                echo "sort by name"

                echo "sort by size"

                for i in $(seq $pos $endpos); do

                        eval echo "\${${list}[$i]}"

                done

                (( ($endpos + 1) < $num )) && echo "next"

        )"'

}



# Start the array.

declare -a FILES 

IFS='

'

FILES=($(ls -1))



# Declare varibles --------------------------------------



# Number of files to show at a time

FILES_PER_SCREEN=22



# Number of files to move up and down when user selects

# "previous" or "next"

STEP=22



# The current position in the list -- index of the first filename to display

POS=0



# Total number of files in current directory

FILE_NUMBER=${#FILES[@]}



make_select_menu FILES $POS $FILE_NUMBER $FILES_PER_SCREEN OPTIONS

QUIT=FALSE



# This will treat only newlines as field separators, so the names containing spaces don't break up.





# Main loop ===========================================

# will run until user chooses to quit

while [ x"$QUIT" = xFALSE ]

do

        clear

                

        # The options select loop -------------------------------        

        select SELECTED in $OPTIONS; 

        do

                # Move down in the list

                if [ x"$SELECTED" = xnext ]

                then

                        (( POS = $POS + $STEP ))

                        make_select_menu FILES $POS $FILE_NUMBER $FILES_PER_SCREEN OPTIONS

                        break



                # Move up in the list

                elif [ x"$SELECTED" = xprevious ] 

                then

                        if [ "$POS" -le "$STEP" ]

                        then POS=0;

                        else (( POS = $POS - $STEP ))

                        fi



                        make_select_menu FILES $POS $FILE_NUMBER $FILES_PER_SCREEN OPTIONS

                        break

                elif [ x"$SELECTED" = "xsort by name" ]

                then

                        FILES=($(ls -1))

                        make_select_menu FILES $POS $FILE_NUMBER $FILES_PER_SCREEN OPTIONS

                        SWITCHES=""

                        break

                elif [ x"$SELECTED" = "xsort by size" ]

                then

                        FILES=($(ls -1 -S))

                        make_select_menu FILES $POS $FILE_NUMBER $FILES_PER_SCREEN OPTIONS

                        SWITCHES="-S"

                        break

                elif [ x"$SELECTED" = x ] 

                then

                        break

                else

          

                        # inner select loop ......................................................

                        select OPERATION in type copy ren del move help copy! del! ren! back quit

                        do

                                if [ x"$OPERATION" = x ]; 

                                then continue

                                elif [ x"$OPERATION" = xtype ]; 

                                then

                                        cat "$SELECTED"

                                elif [ x"$OPERATION" = xcopy ]; 

                                then

                                        echo "Where would like to copy the file to?"

                                        read INPUTX

                                        cp $SELECTED $INPUTX

                                elif [ x"$OPERATION" = xren ]; 

                                then

                                        echo "What would you like the new file name to be?"

                                        read INPUTX

                                        mv $SELECTED $INPUTX

                                        break

                                elif [ x"$OPERATION" = xren! ]; 

                                then

                                        echo "What would you like the new file name to be?"

                                        read INPUTX

                                        mv -f $SELECTED $INPUTX

                                        break

                                elif [ x"$OPERATION" = xdel! ]; 

                                then

                                        rm -r "$SELECTED"

                                        break

                                elif [ x"$OPERATION" = xdel ]; 

                                then

                                        rm "$SELECTED"

                                        break

                                elif [ x"$OPERATION" = xback ]; 

                                then

                                        break

                                elif [ x"$OPERATION" = xhelp ]; 

                                then

                                        echo "the following are commands, and their outputs for this script."

                                        echo "type what is in the file"

                                        echo "copy copys the file to a location"

                                        echo "copy! forcefully, meaning will not prompt, when coping the file"

                                        echo "ren will rename the file"

                                        echo "ren! forcefully, meaning will not prompt, rename a file"

                                        echo "move used to move a file"

                                        echo "move! forcefully, meaning will not prompt, to move the file"

                                        echo "del delete a file"

                                        echo "del! delete a file forcefully"

                                elif [ x"$OPERATION" = xmove ]; 

                                then

                                        echo "Where would you like to move the file to?"

                                        read INPUTX

                                        mv $SELECTED $INPUTX

                                elif [ x"$OPERATION" = xcopy ]; 

                                then

                                        echo "Where would you like to copy the file to?"

                                        read INPUTX

                                        cp -f $SELECTED $INPUTX

                                elif [ x"$OPERATION" = xquit ]; 

                                then exit 0

                                else 

                                        echo "$OPERATION" # code to be executed

                                fi

                        done

                        # end of inner select .....................................................

                        FILES=($(ls -1 $SWITCHES))

                        make_select_menu FILES $POS $FILE_NUMBER $FILES_PER_SCREEN OPTIONS

                        break

                fi

        done

        # end of outer select ----------------------------------------------

done

# end of main loop ===============================================

Millgates you rock dude. High Five!