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$ module load git; echo return_code=$?
load git 2.20.1 (git_DIR, GIT_VERSION, PATH)
return_code=0
$ module load foo; echo return_code=$?
Lmod has detected the following error:  The following module(s) are unknown: "foo"

Please check the spelling or version number. Also try "module spider ..."
It is also possible your cache file is out-of-date; it may help to try:
  $ module --ignore-cache load "foo"

Also make sure that all modulefiles written in TCL start with the string #%Module

return_code=1

$ module load git
load git 2.20.1 (git_DIR, GIT_VERSION, PATH)
usxa@at1-11: ~ [2020-03-18 16:03:57 UTC] [0] 
$ module load git/new
unload git 2.20.1 (git_DIR, GIT_VERSION, PATH)
load git 2.25.1 (git_DIR, GIT_VERSION, PATH)

The following have been reloaded with a version change:
  1) git/2.20.1 => git/2.25.1

$ module avail git

-------------------------------------------------------------------------------------- Global Aliases ---------------------------------------------------------------------------------------
   pa -> prgenv/amd    pe -> prgenv/expert    pg -> prgenv/gnu    pi -> prgenv/intel    pp -> prgenv/pgi

--------------------------------------------------------------------------- /usr/local/apps/modulefiles/lmod/core ---------------------------------------------------------------------------
   git/2.20.1 (D)    git/2.25.1 (new)

  Where:
   Aliases:  Aliases exist: foo/1.2.3 (1.2) means that "module load foo/1.2" will load foo/1.2.3
   D:        Default Module

Use "module spider" to find all possible modules and extensions.
Use "module keyword key1 key2 ..." to search for all possible modules matching any of the "keys".

$ module load git/2
load git 2.20.1 (git_DIR, GIT_VERSION, PATH)
$ module load git/2.25
unload git 2.20.1 (git_DIR, GIT_VERSION, PATH)
load git 2.25.1 (git_DIR, GIT_VERSION, PATH)

The following have been reloaded with a version change:
  1) git/2.20.1 => git/2.25.1

usxa@at1-11: ~ [2020-03-18 16:06:12 UTC] [0] 
$ module load proj4
load proj4 5.2.0 (PROJ4_DIR, PROJ4_VERSION, PROJ4_INCLUDE, PROJ4_LIB, PATH, MANPATH)
usxa@at1-11: ~ [2020-03-18 16:06:29 UTC] [0] 
$ module load proj
load proj 6.1.1 (PROJ_DIR, PROJ_VERSION, PROJ_INCLUDE, PROJ_LIB, PATH, MANPATH)

Lmod is automatically replacing "proj4/5.2.0" with "proj/6.1.1".

unload proj4 5.2.0 (PROJ4_DIR, PROJ4_VERSION, PROJ4_INCLUDE, PROJ4_LIB, PATH, MANPATH)
unload proj 6.1.1 (PROJ_DIR, PROJ_VERSION, PROJ_INCLUDE, PROJ_LIB, PATH, MANPATH)
load proj 6.1.1 (PROJ_DIR, PROJ_VERSION, PROJ_INCLUDE, PROJ_LIB, PATH, MANPATH)