What is the function of the following lines at the top of a shell script file: Directory and Script? Post: 302972303

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Top Forums Shell Programming and Scripting What is the function of the following lines at the top of a shell script file: Directory and Script? Post 302972303 by Aia on Wednesday 4th of May 2016 12:47:36 AM

05-04-2016

Registered User

Quote:

Originally Posted by remytom

The file starts like this:

Code:

Directory: <path to the script>
Script: <script fife name>

#!bin/ksh

##Comments

<actual script>

What is the use of the first two lines in the script? What if I save the file without them? What will be the effect? They are not comments. Im very new to this, please help!

The first line of a script should be the shebang #! which it says what program is supposed to run the script when you make the file executable and run it as ./script.sh

However the script can be run as:
ksh script.sh

If you remove the shebang that's the only option you have.
Anything that starts with just a # (except the #!, when is the first line) will be ignored as commands. They are just human readable comments.

I am assuming that the following does not exist in your actual script, since that will be incorrect.

Code:

Directory: <path to the script>
Script: <script fife name>

Note that your #!bin/ksh should be #!/bin/ksh if your ksh shell lives there.

Last edited by Aia; 05-04-2016 at 01:56 AM..

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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)

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