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Top Forums Shell Programming and Scripting I need to understand the differences between the bash shell and the Bourne shell Post 302368269 by pludi on Wednesday 4th of November 2009 12:33:10 PM
Old 11-04-2009
The line
Code:
#!/bin/bash

is the so-called "shebang" line which tells the system what interpreter to run the script in. It's pretty much the same as the magic bytes in executable formats, like ".ELF" (UNIX) or "MZ" (Windows .exe). This was needed after other shells and interpreters came available other than just the Bourne Shell.

Your other errors probably stem from the sed commands, as probably starting with Korn Shell (which is the base for the POSIX standard shell) the commands for sed have to be passed as a single argument, but the shell splits arguments on spaces. So your first command should (as an example) be written as
Code:
sed -e 's/ -/ DOT./' ipc > raw

 

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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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