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Old 03-01-2014, 05:51 AM   #1
massy
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Registered: Nov 2013
Distribution: CentOS 6.4
Posts: 188
Blog Entries: 1

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My function doesn't return any value to main program!!!


There is my code in below, my problem is that I can't echo return value from _menu function and do other commands...
Code:
_menu()
{
PS3="Enter your choice please: "
select choice in "SSH to VPN" "SSH to APN" "SSH to IP" "Exit"
do
  case "$choice" in
      "SSH to VPN")fping -ga 10.8.0.0/24>IPvar;return 1;;
      "SSH to APN")fping -ga 192.168.40.0/24>IPvar;return 2;;
      "SSH to IP")return 3;;
      "Exit")exit 0;;
  esac
done
}
#while :
#do
   chret=$(_menu)
   echo $chret
   case "$chret" in
      1 | 2)
        cat IPvar
        echo "-------------------------------"
        while read LINE
        do
          IP=$LINE
          ssh  $usr@$IP `cmnd`
        done <IPvar
        echo "-------------------------------"
        ;;
      3)"Enter IP adress to ssh: "
        ssh $usr@$IP `cmnd`
        ;;
    esac
 
Old 03-01-2014, 09:17 AM   #2
grail
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Registered: Sep 2009
Location: Perth
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Well the usual story, when you place set -xv at the start of your script, what do you notice is (is not) happening?

But the answer to your question is the difference between a return / exit value (ie was the command successful or not) and does the command send any output back from being called.

Example:
Code:
$ ls *.txt
file.txt
$ echo $?
0
$ x=$(ls *.txt)
$ echo $?
0
$ echo $x
file.txt
In your case, if you issue the 'echo $?' after you call _menu, you will get the numbers you were expecting, but as none of your command send any data back, as most is redirected, then your variable
is quite correctly empty.
 
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