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Top Forums Shell Programming and Scripting Ctrl-C or Ctrl-Z causing exit the session Post 302433316 by jramesh1 on Tuesday 29th of June 2010 08:01:29 AM
Old 06-29-2010
Ctrl-C or Ctrl-Z causing exit the session

H! I have written script where it need to invoke the perl script in background, then write the pid in temp file then bring back the job to foreground. whenever the Ctrl-C or Ctrl-Z is pressed in the script has to exit and prompt should be dispalyed. but this script causing exit from shell session itself if press Ctrl-C and I tried even after setting stty intr=^c also stty -a is fine. I want to trap both Ctrl-C or Ctrl-Z and it should not exit the session but only script should exit, not login shell.

Did you find any code problem? or what might be the problem? also below fg statement echoing the commond how can we avoid that. I used 2>/dev/null, till it not working.

Please help me in this.

I have written the code as below:
Code:
#!/bin/sh
 cleanup()
 {
   echo "Caught Signal ... Terminated."
   exit 1
 }
        ...       
                  
        while [ 1 ]
 do
 # enter the optional parameter if we need to
         set -m
         #invoke perl script in background
         ${HOME}/${PROCESS}.pl ${OPTIONAL} 2>&1 > $LOGFILENAME &
         #check exit status
         status=$?
         if [ $status -ne 0 ]
         then
                 echo ${PROCESS}.pl ${OPTIONAL} Job fails with status $status
                 exit $status
         fi
         # write the PID into files
         echo $! > ${PID_DIR}/${PROCESS}.perl
         chmod 755 ${PID_DIR}/${PROCESS}.perl
         
         # then bring the job to foreground
         fg %+ 2>/dev/null
         trap 'cleanup' 2 9 15 17 19 20
         sleep ${SLEEP};
 done
 exit 0

Really appeciated if any suggestion.

Last edited by pludi; 06-29-2010 at 09:19 AM.. Reason: code tags, please...
 

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exit(1)                                                            User Commands                                                           exit(1)

NAME
exit, return, goto - shell built-in functions to enable the execution of the shell to advance beyond its sequence of steps SYNOPSIS
sh exit [n] return [n] csh exit [ ( expr )] goto label ksh *exit [n] *return [n] DESCRIPTION
sh exit will cause the calling shell or shell script to exit with the exit status specified by n. If n is omitted the exit status is that of the last command executed (an EOF will also cause the shell to exit.) return causes a function to exit with the return value specified by n. If n is omitted, the return status is that of the last command exe- cuted. csh exit will cause the calling shell or shell script to exit, either with the value of the status variable or with the value specified by the expression expr. The goto built-in uses a specified label as a search string amongst commands. The shell rewinds its input as much as possible and searches for a line of the form label: possibly preceded by space or tab characters. Execution continues after the indicated line. It is an error to jump to a label that occurs between a while or for built-in command and its corresponding end. ksh exit will cause the calling shell or shell script to exit with the exit status specified by n. The value will be the least significant 8 bits of the specified status. If n is omitted then the exit status is that of the last command executed. When exit occurs when executing a trap, the last command refers to the command that executed before the trap was invoked. An end-of-file will also cause the shell to exit except for a shell which has the ignoreeof option (See set below) turned on. return causes a shell function or '.' script to return to the invoking script with the return status specified by n. The value will be the least significant 8 bits of the specified status. If n is omitted then the return status is that of the last command executed. If return is invoked while not in a function or a '.' script, then it is the same as an exit. On this man page, ksh(1) commands that are preceded by one or two * (asterisks) are treated specially in the following ways: 1. Variable assignment lists preceding the command remain in effect when the command completes. 2. I/O redirections are processed after variable assignments. 3. Errors cause a script that contains them to abort. 4. Words, following a command preceded by ** that are in the format of a variable assignment, are expanded with the same rules as a vari- able assignment. This means that tilde substitution is performed after the = sign and word splitting and file name generation are not performed. ATTRIBUTES
See attributes(5) for descriptions of the following attributes: +-----------------------------+-----------------------------+ | ATTRIBUTE TYPE | ATTRIBUTE VALUE | |Availability |SUNWcsu | +-----------------------------+-----------------------------+ SEE ALSO
break(1), csh(1), ksh(1), sh(1), attributes(5) SunOS 5.10 15 Apr 1994 exit(1)
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