Shell menu: returning to menu if a function fails.

[Ranko Kohime]

I'm building a menu for my frequently accessed CLI commands, and I'm trying to work it out so that if a function fails where there were several in the menu option, it will return to the main menu.

Where the following script calls exit 1, what would I put to cause it to skip the remaining commands in the sequence without exiting the script?

     cd /media/IKUSB || { echo -e " "
     	                  echo -e "\t Failed to change directory";
     	                  echo -e "\t Has the Ironkey been mounted & Unlocked?";
                          echo -e " ";
     	                  echo -e "\t Script will exit upon pressing Enter.";
                          echo -e " ";
                          read enterKey;
                          exit 1; };

[ChipOManiac]

I think "break" should do the job

[Ranko Kohime]

I think "break" should do the job

Unfortunately, that has the effect of exiting the script entirely, the same as exit

[ChipOManiac]

Unfortunately, that has the effect of exiting the script entirely, the same as exit

Just put it under a while loop with "true" or something like that so the main part keeps running until the break... the break will then break the while and continue with the script.. (although I really can't tell what your script is attempting to do from the code specified)

^^^ IGNORE ^^^

[ChipOManiac]

Okay... from the code it seems to me that you have tried to access a folder in /media/ which means it has to be a mount thingy...

I use this script to run my homeworld for linux program

  if [ -d /media/HOMEWORLD ]
  then
    echo -e "   ISO Mounted\n   Executing HomeWorld 1 SDL\n   "
    sudo ./homeworld0.3 /window /pilotView /device fx /CDpath "/media/HOMEWORLD"
  else
#    echo -n "   CD Not In Drive, Try Again? Y/N?     "
#    read -e ICDReTry
    echo -e "   ISO Not Mounted\n   Mounting Homeworld 1 ISO\n   "
    sudo mkdir /media/HOMEWORLD
    sudo mount -t iso9660 -o loop /psw/homeworld1/homeworld.iso /media/HOMEWORLD
    echo -e "   ISO Mounted\n   Executing HomeWorld 1 SDL\n   "
    sudo ./homeworld0.3 /window /pilotView /device fx /CDpath "/media/HOMEWORLD"
    sudo umount /media/HOMEWORLD
    sudo rmdir /media/HOMEWORLD
  fi

that "[ -d /media/HOMEWORLD ]" checks to see if that directory exists...

Have I understood correctly?

[Ranko Kohime]

Just put it under a while loop with "true" or something like that so the main part keeps running until the break... the break will then break the while and continue with the script.. (although I really can't tell what your script is attempting to do from the code specified)

^^^ IGNORE ^^^

That just might do the trick. I'll try it out and see how it works.

[Ranko Kohime]

that "[ -d /media/HOMEWORLD ]" checks to see if that directory exists...

That -d command looks handy, I think I'll use it in my script.

*Ranko Kohime is relatively new to shell-scripting

[Ranko Kohime]

Ok, here's another question: How does one do a "while" loop based upon the exit code of a command?

Is it

while : 0

or something else?

Edit: I should probably mention, this is inside of a menu script, so there's a "while" loop controlling the menu. Would having a "while" loop inside the menu break correctly? (i.e., break the menu option and return to the main menu?)

Edit 2: Well, I guess the topic implied that already... Shows how much I'm paying attention.