Linux: pathmunge Command in Shell Script

by on August 12, 2008 · 3 comments· LAST UPDATED August 12, 2008

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Q. I see pathmunge used in few scripts under Red Hat Enterprise Linux. Can you explain the use of pathmunge under RHEL / CentOS / Fedora Linux?

A. Red Hat, CentOS, and Fedora Linux has a pathmunge function defined in /etc/profile file. It will add the directories one by one to the default PATH for the root user.

pathmunge() function is defined in /etc/profile

pathmunge () {
        if ! echo $PATH | /bin/egrep -q "(^|:)$1($|:)" ; then
           if [ "$2" = "after" ] ; then
              PATH=$PATH:$1
           else
              PATH=$1:$PATH
           fi
        fi
}

Path manipulation done using pathmunge:

# Path manipulation
if [ "$EUID" = "0" ]; then
        pathmunge /sbin
        pathmunge /usr/sbin
        pathmunge /usr/local/sbin
fi

As long as you are using Red Hat or CentOS / Fedora Linux, you can use pathmunge. It is best to avoid this function if you need run a shell script on diffrent distributions. I recommend using export bash command for modifying PATH variable.

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{ 3 comments… read them below or add one }

1 Patrick Horgan August 13, 2008 at 9:43 pm

It would have been nice if you explained what the script does! pathmunge adds something to the path only if it wasn’t already there. So if your path contains:
/bin:/usr/bin
pathmunge /usr/bin
will do nothing.
pathmunge /sbin
will result in a path a path containing:
/sbin:/bin:/usr/bin
if instead, you’d said pathmunge /sbin after, the
result would have been:
/bin:/usr/bin:/sbin
For portability, if you need something like this, just make it a part of your script.

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2 dt August 14, 2008 at 4:14 am

I agree, you didn’t really answer much of the question at all. Also, it is not ‘best to avoid this function’ as you state. What is best is follow Patrick’s advice and just copy it directly into your own shell script.

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3 haneen October 7, 2012 at 12:43 am

how to do this task ::Assume a directory contains many .mp3 files taken from albumes. If you are asked to sort them out into separate folders by artist. How would you do that?

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