#!/usr/bin/env : perl no such file or directory Post: 302366990

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Top Forums UNIX for Advanced & Expert Users #!/usr/bin/env : perl no such file or directory Post 302366990 by drl on Saturday 31st of October 2009 07:54:47 AM

10-31-2009

Registered User

Hi.

These are good questions, and it is useful to know the issues. As radoulov has written, the env in the shebang line

Code:

#!/usr/bin/env bash

promotes portability. I use that in a template for writing scripts because I use several environments, and the locations of bash, ksh, perl, etc., are not consistent. This is often true for posting scripts here in this forum because the questions do not always mention the environment, Linux, Solaris, AIX, etc., so I almost always use that for suggested solutions. The Linux documentation for env leaves much to be desired in my opinion. For more information on many subjects including the use of env, see "bash Cookbook", O'Reilly, page 321.

However, we need to balance portability and security. If you have a consistent environment, then, for bash scripts, the construct

Code:

#!/bin/bash -

will avoid certain security risks. See "bash Cookbook", page 283. The authors consider the risks of the env construct to be small, so I generally stay with that.

Best wishes for safety and portability ... cheers, drl

drl

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libbash

LIBBASH(7)							  libbash Manual							LIBBASH(7)

NAME

     libbash -- A bash shared libraries package.

DESCRIPTION

     libbash  is  a package that enables bash dynamic-like shared libraries. Actually its a tool for managing bash scripts whose functions you may
     want to load and use in scripts of your own.

     It contains a 'dynamic loader' for the shared libraries ( ldbash(1)), a configuration tool (ldbashconfig(8)), and some libraries.

     Using ldbash(1) you are able to load loadable bash libraries, such as getopts(1) and hashstash(1).  A bash shared library that can be  loaded
     using
     ldbash(1) must answer 4 requirments:

     1.     It must be installed in $LIBBASH_PREFIX/lib/bash (default is /usr/lib/bash).

     2.     It must contain a line that begins with '#EXPORT='.  That line will contain (after the '=') a list of functions that the library
	    exports.  I.e. all the function that will be usable after loading that library will be listed in that line.

     3.     It must contain a line that begins with '#REQUIRE='.  That line will contain (after the '=') a list of bash libraries that are
	    required for our library.  I.e. every bash library that is in use in our bash library must be listed there.

     4.     The library must be listed (For more information, see ldbashconfig(8)).

   Basic guidelines for writing library of your own:
     1.     Be aware, that your library will be actually sourced. So, basically, it should contain (i.e define) only functions.

     2.     Try to declare all variables intended for internal use as local.

     3.     Global variables and functions that are intended for internal use (i.e are not defined in '#EXPORT=') should begin with:
		  __<library_name>_
	    For example, internal function myfoosort of hashstash library should be named as
		  __hashstash_myfoosort
	    This helps to avoid conflicts in global name space when using libraries that come from different vendors.

     4.     See html manual for full version of this guide.

AUTHORS

     Hai Zaar <haizaar@haizaar.com>
     Gil Ran <ril@ran4.net>

SEE ALSO

     ldbash(1), ldbashconfig(8), getopts(1), hashstash(1) colors(1) messages(1) urlcoding(1) locks(1)

Linux								       Epoch								     Linux