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Full Discussion: Exit statement ignored inside KSH function
Top Forums Shell Programming and Scripting Exit statement ignored inside KSH function Post 302284675 by gkubok on Friday 6th of February 2009 05:07:53 AM
Old 02-06-2009
Exit statement ignored inside KSH function
Hi All,

I have multiple functions in my script and I'm trying to capture stdout from some of them, but I also do some error checking in them (in the functions that output something to their stdout that needs capturing) and I need to be able to end the entire script with an error message.

KSH version I'm using is the default that comes with AIX 6.1 (6100-02-02-0849), which is M-11/16/88f.

Consider the following example:

Code:
#!/usr/bin/ksh
func2() {
        echo "func2"
        # let's say some error occured here
        # and I need to stop the entire script
        exit 1
}
func1() {
        echo "func1"
        func2
}
func1 # 1st call
func1 # 2nd call

As expected, the output of this script is:
 
func1
func2

Now consider this example:
 
#!/usr/bin/ksh
func2() {
        echo "func2"
        # let's say some error occured here
        # and I need to stop the entire script
        exit 1
}
func1() {
        echo "func1"
        out=`func2`
        echo $out
}
func1 # 1st call
func1 # 2nd call

The output of this one is:
 
func1
func2
func1
func2

So both 'func1' calls at the bottom of the script are processed. Because I'm capturing the stdout of 'func2' function, the exit seems to be treated as return. Same problem exists when I try to re-direct stdout (using pipe, i.e. a call like this: func2 | tr '[a-z]' '[A-Z]' from func1 has the same unintended effect), basically, every time I tap into stdout, the exit doesn't stop the entrie script. I'd also prefer not to use temporary files or anything like that (that would also be redirecting stdout so it may not work either, but I haven't tried it yet, as I consider it untidy). I would also like to avoid checking for retrun code of the function outside it, I do all error checking and messaging inside the function that outputs things on stdout, so the neatest approach is to simply exit the script from that function if critical error occurs. How do I make the exit statement always terminate the script?

Thanks in advance,

--
Greg.
Last edited by Franklin52; 02-06-2009 at 06:41 AM.. Reason: adding code tags
 

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vm

VM(1)								      mgetty								     VM(1)

NAME

       vm - VoiceModem is the program for handling the voice modem functionality from shell scripts

ACTIONS

       beep options [<frequency [<length in 0.001sec>]]>
       diagnostics options device name (e.g. ttyS2
       dial options phone number
       help
       play options [<file names]+>
       record options file name
       shell options [<shell script [shell options]]>
       wait  options [<time in seconds]>
       devicetest

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       -d n set i/o device
       -t, -m, -i, -e, -s, -H equals to -d <2,3,4,5,6,7>
       -l s set device string (e.g. -l ttyS2:ttyC0)
       -v verbose output
       -w use off / on hook signal from local handset to start and stop recording
       -x n set debug level
       -L n set maximum recording length in sec
       -P print first DTMF tone on stdout and exit
       -R read and print DTMF string on stdout and exit
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SEE ALSO

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POD ERRORS

       Hey! The above document had some coding errors, which are explained below:

       Around line 30:
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	   '=item' outside of any '=over'

       Around line 71:
	   You forgot a '=back' before '=head1'

perl v5.10.1							    2010-04-04								     VM(1)
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