Re: Adding to the PATH but not if already in $PATH

[Eric Bambach <eric@cisu.net>]

On Saturday 26 February 2005 12:17 pm, you wrote:
> I want to prepend a directory to my PATH in my $HOME/.bashrc and export the
> result. But I only want it to happen once: iow, if a directory I want
> prepended is already in the PATH, do not prepend it again.
>
> Something like:
>
>    if "/home/dw/bin" not in $PATH ; then
>    PATH=/home/dw:$PATH
>    export PATH
>    fi
>
> The questions are: Is this the way one guards against multiple additions in
> subshells? Is there a way to check for a substring?

sed and grep can help.

echo $PATH | grep 'SOMEPATH'
if [ $? == 0 ];then
 export PATH
else
        PATH=NEWPATH
fi

Check the login on that though, shouldnt be too hard.
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-- 
----------------------------------------
--EB

> All is fine except that I can reliably "oops" it simply by trying to read
> from /proc/apm (e.g. cat /proc/apm).
> oops output and ksymoops-2.3.4 output is attached.
> Is there anything else I can contribute?

The latitude and longtitude of the bios writers current position, and
a ballistic missile.

                --Alan Cox LKML-December 08,2000 

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