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Top Forums Shell Programming and Scripting Test for shell interpreter at beginning of script Post 302328631 by methyl on Wednesday 24th of June 2009 09:45:07 PM
Old 06-24-2009
I agree with "bwhited".
If possible, write the script to the lowest common denominator.

Failing that write a controlling script in basic shell which calls named scripts containing a shebang for the preferred shell.

I usually use "uname -s" to identify the environment, but a truly portable script will need to know versions.

IMHO variations on "echo", "find", "awk" (or "nawk"), and "df" (or "bdf") are the biggest pain. You either need a portable script which decides which command suits the environment or a suite of custom scripts for each environment.

BTW. If all your systems are modern this board will seek out the POSIX shell. No problem there.

Others may wish to comment.
 

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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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