On Fri, Jun 24, 2022 at 6:04 PM Jon LaBadie jonfu@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 <anilduggirala@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