On Fri, Jun 24, 2022 at 6:04 PM Jon LaBadie <jo...@jgcomp.com> wrote:
> On Fri, Jun 24, 2022 at 07:36:00AM -0800, 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.
> >
> >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: $PATH:/my/path/:/my/path,
> >> my directory has been appended twice.
> >> I don't know exactly what the "export" command actually does, so I am
> >> lost here.
> >> thanks for your help.
>
> Conceptually similar to Roger's approach, I set an environment
> variable "OrigPATH" to the initial PATH then assign PATH based
> on OrigPATH.
>
> # save a copy of the original path to modify
> export OrigPATH=${OrigPATH:-$PATH}
> # adjust PATH from OrigPATH to my tastes
> export PATH=$HOME/bin:$OrigPATH:/my/path
>
Environment modules preserves the current environment
and then adds or modifies environment variables according
to a "modulefile". The original has been around for decades,
there is now a lua version. Fedora uses environment modules
when building rpm's that support more than one choice for
supporting libraries. See:
% ls /usr/share/modulefiles/mpi
mpich-x86_64 openmpi-x86_64
--
George N. White III
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