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Full Discussion: List of 'if -f' options - AIX / Korn Shell
Top Forums UNIX for Dummies Questions & Answers List of 'if -f' options - AIX / Korn Shell Post 302594811 by jim mcnamara on Wednesday 1st of February 2012 08:52:43 AM
Old 02-01-2012
There also is a difference between [[ ]] and [ ] - they are likewise not identical. For example, [[ ]] is a builtin, [ ] actually invokes test.
Therefore [[ ]] is more efficient.
This User Gave Thanks to jim mcnamara For This Post:
Grueben
 

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LEARN ABOUT FREEBSD

which

WHICH(1)						    BSD General Commands Manual 						  WHICH(1)

NAME

     which -- locate a program file in the user's path

SYNOPSIS

     which [-as] program ...

DESCRIPTION

     The which utility takes a list of command names and searches the path for each executable file that would be run had these commands actually
     been invoked.

     The following options are available:

     -a      List all instances of executables found (instead of just the first one of each).

     -s      No output, just return 0 if all of the executables are found, or 1 if some were not found.

     Some shells may provide a builtin which command which is similar or identical to this utility.  Consult the builtin(1) manual page.

SEE ALSO

     builtin(1), csh(1), find(1), locate(1), whereis(1)

HISTORY

     The which command first appeared in FreeBSD 2.1.

AUTHORS

     The which utility was originally written in Perl and was contributed by Wolfram Schneider <wosch@FreeBSD.org>.  The current version of which
     was rewritten in C by Daniel Papasian <dpapasia@andrew.cmu.edu>.

BSD
								 December 13, 2006							       BSD
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