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  • Tracing a Qshell Variable

    June 19, 2002 Timothy Prickett Morgan

    Hey, Ted:

    A variable is getting changed in a Qshell script, but I can’t determine where it’s happening. How can I track changes to a variable?

    — Len

    Add the following lines to the top of the script:

    trap 'echo "DBG: $var = "$var""' DEBUG
    set -x 
    

    The trap command with the DEBUG condition executes the command between single quotes (‘) after each simple command of the script runs. In this case, Qshell echoes the value of a variable named var to the display. Replace var with the name of your variable.

    The set command with -x option causes Qshell to echo each command to stderr before running it.

    This is going to clutter up the display, but you should find where the variable changes and which command changes it.

    — Ted

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    Tags: Tags: mgo_rc, Volume 2, Number 47 -- June 19, 2002

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MGO Volume: 2 Issue: 47

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    Table of Contents

    • String Parameters of Various Lengths
    • Tracing a Qshell Variable
    • LAYOUT: An Improved DSPFFD

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