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Full Discussion: Bash : Why are spaces important here ?
Top Forums Shell Programming and Scripting Bash : Why are spaces important here ? Post 302932299 by cfajohnson on Tuesday 20th of January 2015 01:13:18 PM
Old 01-20-2015
Quote:
Originally Posted by Corona688
Code:
$ whereis [

[: /usr/bin/[
$

It's usually a built-in as well, but the command must exist. The shell must treat it as a command.

Rather than whereis, use type; It tells you what the shell will actually use:

Code:
$ type [
[ is a shell builtin

With the -a option, it gives all the possible commands that could be executed:

Code:
$ type -a [
[ is a shell builtin
[ is /usr/bin/[

[ is also a synonym for test.
These 4 Users Gave Thanks to cfajohnson For This Post:
balajesuri John K migurus Scrutinizer
 

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LEARN ABOUT FREEBSD

atf-sh

ATF-SH(1)						    BSD General Commands Manual 						 ATF-SH(1)

NAME

     atf-sh [-s shell] -- interpreter for shell-based test programs

SYNOPSIS

     atf-sh script

DESCRIPTION

     atf-sh is an interpreter that runs the test program given in script after loading the atf-sh(3) library.

     atf-sh is not a real interpreter though: it is just a wrapper around the system-wide shell defined by ATF_SHELL.  atf-sh executes the inter-
     preter, loads the atf-sh(3) library and then runs the script.  You must consider atf-sh to be a POSIX shell by default and thus should not
     use any non-standard extensions.

     The following options are available:

     -s shell	  Specifies the shell to use instead of the value provided by ATF_SHELL.

ENVIRONMENT

     ATF_LIBEXECDIR    Overrides the builtin directory where atf-sh is located.  Should not be overridden other than for testing purposes.
     ATF_PKGDATADIR    Overrides the builtin directory where libatf-sh.subr is located.  Should not be overridden other than for testing purposes.
     ATF_SHELL	       Path to the system shell to be used in the generated scripts.  Scripts must not rely on this variable being set to select a
		       specific interpreter.

EXAMPLES

     Scripts using atf-sh(3) should start with:

	   #! /usr/bin/env atf-sh

     Alternatively, if you want to explicitly choose a shell interpreter, you cannot rely on env(1) to find atf-sh.  Instead, you have to hardcode
     the path to atf-sh in the script and then use the -s option afterwards as a single parameter:

	   #! /path/to/bin/atf-sh -s/bin/bash

ENVIRONMENT

     ATF_SHELL	  Path to the system shell to be used in the generated scripts.

SEE ALSO

     atf-sh(3)

BSD
								September 27, 2014							       BSD
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