...It consist of 4 scripts: cprobe, cltest, cppdef, mkdep.
cstem scripts can be used standalone or as part of software build systems.
All scripts are portable and have no dependencies.
See wiki for more information and examples.
...If command is OK than it exists in PATH and can be run.
It is a simple, small and portable Bash script. It is useful in software packages that want to check that some commands exist before trying to run them.
See wiki for more information and examples.