02-23-2012
Thanks Corona688
Thank you, Corona688. I think your explanation covered every base I could expect to find in such a complicated concept. I will have to woodshed a bit at this point to truly understand what you said. Because you pointed me in the right directions as far as what to look at as well as the concept behind a very dynamic path variable, I will be able to eventually understand. Thanks!
---------- Post updated at 06:14 PM ---------- Previous update was at 05:57 PM ----------
Edit: I found what seems to be a comprehensive explanation of how PATH is constructed, at least in MAC OSX 10.5 and up. This link below explains that a script called path_helper located in /etc/profile looks at text files in /etc to construct the PATH and MANPATH variables.
softec.lu/site/DevelopersCorner/MasteringThePathHelper
Last edited by Alexander4444; 02-26-2012 at 06:19 PM..
Reason: help poster
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LEARN ABOUT DEBIAN
shtool-path
SHTOOL-PATH.TMP(1) GNU Portable Shell Tool SHTOOL-PATH.TMP(1)
NAME
shtool-path - GNU shtool command dealing with shell path variables
SYNOPSIS
shtool path [-s|--suppress] [-r|--reverse] [-d|--dirname] [-b|--basename] [-m|--magic] [-p|--path path] str [str ...]
DESCRIPTION
This command deals with shell $PATH variables. It can find a program through one or more filenames given by one or more str arguments. It
prints the absolute filesystem path to the program displayed on "stdout" plus an exit code of 0 if it was really found.
OPTIONS
The following command line options are available.
-s, --suppress
Supress output. Useful to only test whether a program exists with the help of the return code.
-r, --reverse
Transform a forward path to a subdirectory into a reverse path.
-d, --dirname
Output the directory name of str.
-b, --basename
Output the base name of str.
-m, --magic
Enable advanced magic search for ""perl"" and ""cpp"".
-p, --path path
Search in path. Default is to search in $PATH.
EXAMPLE
# shell script
awk=`shtool path -p "${PATH}:." gawk nawk awk`
perl=`shtool path -m perl`
cpp=`shtool path -m cpp`
revpath=`shtool path -r path/to/subdir`
HISTORY
The GNU shtool path command was originally written by Ralf S. Engelschall <rse@engelschall.com> in 1998 for Apache. It was later taken
over into GNU shtool.
SEE ALSO
shtool(1), which(1).
18-Jul-2008 shtool 2.0.8 SHTOOL-PATH.TMP(1)