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Top Forums Shell Programming and Scripting problem executing awk in shell "not found" Post 302469928 by script_op2a on Monday 8th of November 2010 04:43:07 PM
Old 11-08-2010
Quote:
Originally Posted by scottn
The difference between
Code:
awk '{print $0;}' $infile

and
Code:
awk '{print $0;}' < $infile

is whether to open a file for reading ($input) or reading from an existing file (standard input).

Unless you're keen to know the name of the file you're reading for, there's no real difference in this case.

As for "POSIX", when asked what OS you are using, it's neither here nor there.
I was told that it's POSIX, similar to the Korn shell. That you could use:

#!/usr/bin/sh
or
#!/usr/bin/ksh


in the shell scripts but they seem to work differenly so I'm sticking to /sh


 

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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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