PSL is the successor of my personal shell library named jfsh, but it intends to be used much more widely and to be cleaner and better documented.
The primary goal of PSL is to offer tools to program easily and securely shell scripts, as its name indicates, portable across as much sh-like shell interpreters as possible.
The secondary goal of PSL is to be efficient by using, when possible, builtin features over external programs.
PSL has been tested with Bash, dash, Ksh and zsh.
To use PSL's facilities, all you have to do is to source the “psl.sh” file, if
it is in the “PATH” you can simply do . psl.sh.
For performance concerns, “psl.sh” prevents himself from be being loaded multiple times, but if you really want to reload PSL, simply unload it before (see the next section).
If you don't want to use PSL anymore in your script and you want to clean the environment from all PSL's objects, you may use the “psl_unload()” function.