Re: how to change environment variable permanently

[George N. White III]

On Fri, Jun 24, 2022 at 12:36 PM Roger Heflin  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 
> 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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