On Fri, Jun 24, 2022 at 12:36 PM Roger Heflin <rogerhef...@gmail.com> wrote:
> Trick is add this around the path add.
>
> If [ $path_add -ne 1 ] ; then
> Path addition code
> Path_add=1
> Fi
>
> That only runs it once.
>
This clutters up the environment. I often encountered weird environment
variables when a
user had problems. Fedora's /etc/profile defininition of "pathmunge"
checks to see if the proposed entry
is already present:
pathmunge () {
case ":${PATH}:" in
*:"$1":*)
;;
*)
if [ "$2" = "after" ] ; then
PATH=$PATH:$1
else
PATH=$1:$PATH
fi
esac
}
Exercise left to the reader: modify path_munge to only add directories that
actually exist
on the system.
I have seen environments with:
"some_application_version_N/bin:...:some_application_version_1/bin:..."
or
"...:some_application_version_N-1/bin:...:some_application_version_N/bin:
and user
wonders why the new version seems to be the same as the old version.
Environment modules are handy when you want to choose a version to use on
the
command-line.
>
> On Fri, Jun 24, 2022, 4:09 AM Anil F Duggirala <anilduggir...@fastmail.fm>
> wrote:
>
>> hello,
>> I would like to change the $PATH environment variable permanently, to
>> be able to execute a program more quickly.
>> I have tried adding a new line: export PATH=$PATH:/my/path , to my
>> .bashrc .
>> When I log in again, I see that $PATH is now: $PATH:/my/path/:/my/path,
>> my directory has been appended twice.
>> I don't know exactly what the "export" command actually does, so I am
>> lost here.
>> thanks for your help.
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--
George N. White III
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