[SOLVED] Using while loop & select statement

Kustom42 · 05-14-2013, 04:01 PM

This is a progression from previous threads but they aren't really related anymore so creating a new one here. this is my code:

Code:

while read -r VCENTER DC CLUSTER HOST VMNAME
do
        case "$DC" in
        removed)
                echo -e "Found $VMNAME in removed"
                echo $VMNAME >> $NEWMRLVMS
                MRLVMS=$(($MRLVMS + 1))
                ;;
       removed)
                echo -e "Found $VMNAME in removed"
                PHXVMS=$(($PHXVMS + 1))
                echo $VMNAME >> $NEWPHXVMS
                ;;
        *)
                echo -e "$RED Unable to identify data-center for $VMNAME $NORMAL"
                ;;
        esac


        while [ "$MRLVMS" -ne 0 ]
        do

                echo -e "Please select the proxy below to add $VMNAME to:"
                select MRLPROXY in "${Mrl100Array[@]}" ; do
                        case  $MRLPROXY in
                        *_100_sun)
                        echo -e "Adding $VMNAME to removedon Sunday's schedule"
                        MRLVMS=$(($MRLVMS - 1))
                        ;;
                        *_100_mon)
                        echo -e "Adding $VMNAME to removedon Monday's schedule"
                        ;;
                        esac

                done

        done


done < $VMLIST

Removed a few things for security reasons but the all the code is there. The problem I have is with the second while loop. I want to have a loop that will iterate through and ask the user to select a command with the select builtin, the case statement would then match the pattern chosen from the select menu and then decrease the integer by one and the loop would re-run again until the integer decreases to 0.

When I run the code in its current form it does loop but it does not stop and wait for the user to make a selection. It seems like the while loop is not waiting for response whats teh best way to achieve this sort of looping method with a menu?

Kustom42 · 05-14-2013, 05:21 PM

Made some changes and exported my variables and tried creating a second while loop but still having no luck:

Code:

        while read -r VMNAME
        do
                if [ "$MRLVMS" -ne 0 ]
                then
                        select MRLPROXY in "${removed[@]}" ; do
                                case  $MRLPROXY in
                                *_100_sun)
                                echo -e "Adding $VMNAME to removed on Sunday's schedule"
                                MRLVMS=$(($MRLVMS - 1))
                                ;;
                                *_100_mon)
                                echo -e "Adding $VMNAME to removed on Monday's schedule"
                                ;;
                                esac

                        done
                fi
        done < $NEWMRLVMS

It now will only echo the array once but still does not wait for user response on the select statement?? I also tried using a an echo & read combo but same result.

Here is the output from the loop:

Code:

1) 27_103_sun     7) 22_103_sat   13) 26_101_fri   19) 19_102_thur
2) 18_103_mon     8) 29_101_sun   14) 21_101_sat   20) 26_102_fri
3) 18_103_tue     9) 30_101_mon   15) 18_102_sun   21) 21_102_sat
4) 20_103_wed    10) 30_101_tue   16) 30_102_mon
5) 21_103_thur   11) 30_101_wed   17) 18_102_tue
6) 24_103_fri    12) 23_101_thur  18) 21_102_wed
#? #? #? #? #? #? #? #? #? #? #? #? #? #? #? #? #? #? #?

You can see that the select is sent to the terminal 19 times which is the integer value of $MRLVMS so the loop part of the loop works just fine just need to figure out a way to get it to stop on each iteration of the loop and wait for user input so I can execute commands based on that input.

gnashley · 05-15-2013, 02:46 AM

You can't put a read inside a read loop. You'll need to redirect stdin to a new file descriptor and then read the second loop from the new fd.

ta0kira · 05-17-2013, 07:36 AM

Quote:

Originally Posted by gnashley

You can't put a read inside a read loop. You'll need to redirect stdin to a new file descriptor and then read the second loop from the new fd.

This might be a solution:

Code:

#!/bin/bash

{ while read file; do
  read -p "do you know about $file? " answer 0<&3
  echo "you said '$answer'."
done < <(ls); } 3<&0

Kevin Barry

konsolebox · 05-17-2013, 08:43 AM

Or just use read -u:

Code:

while read -u 4 LINE; do
    read ...
done 4< input.file

Of course it's only available in Bash 3.0+.