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Full Discussion: Handling standard error in condition
Top Forums Shell Programming and Scripting Handling standard error in condition Post 302880746 by maverick72 on Monday 23rd of December 2013 05:40:00 AM
Old 12-23-2013
Handling standard error in condition
Testing this with KSH on RHEL

The bellow code works but i can't seem to handle the exit status of the unix command when it fails... i wanted to put something like >/dev/null 2>&1 to manage standard output and standard error but it changes my logic and the code doesn't work cause it doesn't return true when the ls works.

Mind that i know i could use the -f to test the file but in my production script it tests the return status of a service command. That is why i wanted to evaluate the $? of the unix command.

Maybe it is not the proper way to code this? I'm fully open to suggestions.

Its pretty simple. Test all the services and if you find one that is "true" then set the rcControlRule to 1 and if you find one exit the function with the rcControlRule to 1.

Code:
#!/bin/ksh

set -A services "toto" "titi" "tata" "/etc/redhat-release" "tete"

check_service () {
        i=0
        while [[ $i -le "${#services[@]}" ]] && [[ rcControlRule -ne 1 ]]; do
                if [ "$(ls "${services[$i]}")" ]; then
                        rcControlRule=1
                        echo "${services[$i]}"
                else
                        rcControlRule=0
                fi
        (( i+=1 ))
        done
        return ${rcControlRule}
}

echo "Start"

check_service

echo "${rcControlRule}"

echo Done

Code:
 ./test.ksh
Start
ls: cannot access toto: No such file or directory
ls: cannot access titi: No such file or directory
ls: cannot access tata: No such file or directory
/etc/redhat-release
1
Done

 

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LEARN ABOUT XFREE86

suspend

suspend(1)                                                         User Commands                                                        suspend(1)

NAME

       suspend - shell built-in function to halt the current shell

SYNOPSIS

   sh
       suspend

   csh
       suspend

   ksh
       suspend

DESCRIPTION

   sh
       Stops the execution of the current shell (but not if it is the login shell).

   csh
       Stop the shell in its tracks, much as if it had been sent a stop signal with ^Z. This is most often used to stop shells started by su.

   ksh
       Stops the execution of the current shell (but not if it is the login shell).

ATTRIBUTES

       See attributes(5) for descriptions of the following attributes:

       +-----------------------------+-----------------------------+
       |      ATTRIBUTE TYPE         |      ATTRIBUTE VALUE        |
       +-----------------------------+-----------------------------+
       |Availability                 |SUNWcsu                      |
       +-----------------------------+-----------------------------+

SEE ALSO

       csh(1), kill(1), ksh(1), sh(1), su(1M), attributes(5)

SunOS 5.10                                                          15 Apr 1994                                                         suspend(1)
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