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Newbie CentOS Scripting Question..

Hi everyone,

Long time forum lurker..first time user here.

I am a COMPLETE newbie to all things Unix/Linux and I was hoping for a little advice (or appropriate direction) on a scripting problem I have been set.

I was been asked (college lecturer) to write a script which will display the user options that which will allow a user to:

1. create a file
2. delete a file
3. change permissions
4. rename a file
5. copy a file
6. exit

I started by creating the script, and echoing the options to screen..but from there I am completely lost!

I have previously used the Case & If selection structures but only to echo input back to screen, but that is about as far as I have gone.

Any advice would be gratefully appreciated!

I'm assuming you're writing a Bash script. This is a good reference for Bash scripting. Look in the section on command substitution since you're just writing a script that wraps shell commands. For example, with the first option you could use the shell command touch to create the file.

Quote:

Originally Posted by Clark-Kent (Post 5260342)

OK, first get the menu looking good. We'll add the functionality in later functions.

Code:

menu () {

echo "$name version $ver"

echo "----------------------------------------------"

echo "1) Specify file"

echo "2) Create file"

echo "3) Delete file"

echo

echo "4) Change file permissions"

echo "5) Rename file"

echo "6) Exit"

echo "----------------------------------------------"

read menunum

}

Then, we'll add the functions of the menu.

Code:

op1 () {

clear

echo "Please enter the path (including desired filename) below"

read newfile

touch $newfile

clear

echo "File has been created."

menu

}



op2 () {

clear

echo "Please enter the path of the file to delete below."

read delfile

clear

echo "Would you like to shred the file or just delete it?"

echo "1) Delete"

echo "2) Shred"

echo "--------------------------------------------------"

read delchoice

if [[ $delchoice = 1 ]] ; then 

        rm $delfile

else

        shred -u $delfile

fi

clear

echo "Delete file complete."

menu

}



op3 () {

clear

echo "Please enter the target file path below"

read targfileperms

clear

echo "Please enter the chmod parameters below"

read chmodparams

clear

chmod $chmodparams $targfileperms

echo "Change of permissions on target file complete."

menu

}



op4 () {

#rename file

clear

echo "Please enter the path of the file to be renamed and/or moved"

read path1

clear

echo "Please enter the path of the target file (name included)"

read destpath

mv $path1 $destpath 

clear

echo "Rename complete."

menu

}

Now we want to tie the menu to the menu functions. I'll just use if statements, you can change them to case if you like.

Code:

if [[ menunum = 1 ]] ; then

op1

elif [[ menunum = 2 ]] ; then

op2

elif [[ menunum = 3 ]] ; then

op3

elif [[ menunum = 4 ]] ; then

op4

else 

echo "Please type a valid number option."

menu

fi

And you put it all together, and you get something like the attached.
NOTE: I didn't debug this, if you want to use it, you debug it. You're the one that will be writing it. ;)

Quote:

Originally Posted by Ihatewindows522 (Post 5260399)

OK, first get the menu looking good. We'll add the functionality in later functions.

Code:

menu () {

echo "$name version $ver"

echo "----------------------------------------------"

echo "1) Specify file"

echo "2) Create file"

echo "3) Delete file"

echo

echo "4) Change file permissions"

echo "5) Rename file"

echo "6) Exit"

echo "----------------------------------------------"

read menunum

}

Then, we'll add the functions of the menu.

Code:

op1 () {

clear

echo "Please enter the path (including desired filename) below"

read newfile

touch $newfile

clear

echo "File has been created."

menu

}



op2 () {

clear

echo "Please enter the path of the file to delete below."

read delfile

clear

echo "Would you like to shred the file or just delete it?"

echo "1) Delete"

echo "2) Shred"

echo "--------------------------------------------------"

read delchoice

if [[ $delchoice = 1 ]] ; then 

        rm $delfile

else

        shred -u $delfile

fi

clear

echo "Delete file complete."

menu

}



op3 () {

clear

echo "Please enter the target file path below"

read targfileperms

clear

echo "Please enter the chmod parameters below"

read chmodparams

clear

chmod $chmodparams $targfileperms

echo "Change of permissions on target file complete."

menu

}



op4 () {

#rename file

clear

echo "Please enter the path of the file to be renamed and/or moved"

read path1

clear

echo "Please enter the path of the target file (name included)"

read destpath

mv $path1 $destpath 

clear

echo "Rename complete."

menu

}

Now we want to tie the menu to the menu functions. I'll just use if statements, you can change them to case if you like.

Code:

if [[ menunum = 1 ]] ; then

op1

elif [[ menunum = 2 ]] ; then

op2

elif [[ menunum = 3 ]] ; then

op3

elif [[ menunum = 4 ]] ; then

op4

else 

echo "Please type a valid number option."

menu

fi

And you put it all together, and you get something like the attached.
NOTE: I didn't debug this, if you want to use it, you debug it. You're the one that will be writing it. ;)

Wow, thank you VERY much!! I didn't expect that level of help..but REALLY appreciated!! :D

Quote:

Originally Posted by Fred Caro (Post 5260550)

Did it work?

Fred.

Not quite..I am getting a "syntax error near unexpected token 'fi' message.

Playing around with it, but not luck fixing it yet..any suggestions if someone sees something I don't would be appreciated! :)

Quote:

Originally Posted by Clark-Kent (Post 5260743)

Like I said, the debugging is up to you. ;)

Quote:

Originally Posted by Ihatewindows522 (Post 5260846)

Like I said, the debugging is up to you. ;)

Yes you did! :D

Nearly there..sorted out the 'fi' bug, a couple more to finish off..hopefully!!

Great learning process!! :)

Adding

Code:

set -xv

to the top will show you exactly what its doing