filename-is-complete? -- Return true if FNAME is a fully qualified pathname.
find-file-in-path -- Search for file named FNAME in PATH.
string-list->string -- Convert L, a list of strings or characters, to a string.
path-list->string-with-colons -- Convert L, a list of string directory names, to a single colon-separated string.
string-with-colons->path-list -- Convert S, a colon-separated directory pathlist, into a list of directory strings.
read-until-eof -- Return all the text from input port IN until eof.
output-of-system-cmd -- Return the output of command shell execution of CMD.
first-line-output-of-system-cmd -- Return the first line of output of command shell execution of CMD.