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Run the specified shell command. If collect-output-p is
then run the command synchonously and collect the output. Be
careful. If the shell command doesn’t return, it will hang StumpWM. In
such a case, kill the shell command to resume StumpWM.
Return a list of programs in the path. if full-path is
t then return the full path, otherwise just return the
filename. path is by default the
PATH evironment variable
but can be specified. It should be a string containing each directory
seperated by a colon.
Return T if the pathname describes an executable file.
The shell program used by
Return the value of the environment variable.
Set the value of the environment variable, var to val.
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