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Top Forums UNIX for Dummies Questions & Answers Use programs in shared folder except ones in my home dir Post 302962715 by bakunin on Thursday 17th of December 2015 03:50:30 PM
Old 12-17-2015
What Don is telling you is (and this, btw., has nothing to do with the system being a cluster or not - it is simply the behavior of every shell i know of, including bash):

The PATH variable is a list of directories, separated by colon characters:

Code:
PATH=/dir/one:/dir/two:/dir/three:[....]

When you enter the name of a binary to be executed without giving any path, this list is searched from its first entry onwards, until the binary is found. With the above setting, if you enter foo as the binaries name the shell will first look for a /dir/one/foo binary. If there is none found, it will try a /dir/two/foo and so on. The catch now is that the process stops once such a binary is indeed found, so that subsequent possible matches (like a /dir/two/foo in case of an existing /dir/one/foo) will be "masked". You can still execute them if you enter the complete path, but by only entering the name without a path you get the first match along the list of directories your PATH variable contains.

This is why by simply altering your PATH variable you can state your "preferences" about which one (ofs everal possible) executables you want to have executed by default.

I hope this helps.

bakunin
This User Gave Thanks to bakunin For This Post:
 

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FILECAP:(8)						  System Administration Utilities					       FILECAP:(8)

NAME
filecap - a program to see capabilities SYNOPSIS
filecap [ -a | -d | /dir | /dir/file [cap1 cap2 ...] ] DESCRIPTION
filecap is a program that prints out a report of programs with file based capabilities. If a file is not in the report or there is no report at all, no capabilities were found. For expedience, the default is to check only the directories in the PATH environmental variable. If the -a command line option is given, then all directories will be checked. If a directory is passed, it will recursively check that directory. If a path to a file is given, it will only check that file. If the path to the file includes capabilities, then they are written to the file. OPTIONS
-a This tells the program to show all capabilities starting from the / directory. Normally the PATH environmental variable is used to show you capabilities on files you are likely to execute. -d This dumps all capabilities for reference. EXAMPLES
To check file capabilities in $PATH: filecap To check file capabilities of whole system: filecap -a To check file capabilities recursively in a directory: filecap /usr To check file capabilities of a specific program: filecap /bin/passwd To list all possible capabilities: filecap -d To set a file capability on a specific program: filecap /bin/ping net_raw net_admin SEE ALSO
pscap(8), netcap(8), capabilities(7). AUTHOR
Steve Grubb Red Hat March 2009 FILECAP:(8)
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