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Full Discussion: First line of a script
Top Forums Shell Programming and Scripting First line of a script Post 302901893 by SkySmart on Friday 16th of May 2014 08:58:59 AM
Old 05-16-2014
First line of a script
so we all know the first line of a shell script has to have the shell defined as in:
Code:
#!/bin/bash

so, how do i have this automatically changed in a script so a certain shell is used, given the OS the script is running on?

i tried making this the very first few lines in the script:

Code:
UNAMEA=$(uname)
if [ "${UNAMEA}" = "SunOS" ] ; then
        echo "#!/usr/xpg4/bin/bash"
else
        echo "#!/bin/bash"
fi

which kicks out errors such as this:

Code:
script.sh: line 4: syntax error near unexpected token `else'
script.sh: line 4: `else'

any ideas on how to accomplish what i'm trying to do?
 

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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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