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Full Discussion: Scripts without shebang
Top Forums Shell Programming and Scripting Scripts without shebang Post 302694941 by methyl on Friday 31st of August 2012 06:05:54 PM
Old 08-31-2012
@kraljic
To answer your main theme:

It is recommended to specify the full path when executing a script and have a correct Shebang line in the script. This is unambiguous and quick.
It is not recommended to invoke the Shell directly with a parameter of the script name (with or without the full path).

If there is no Shebang line and the Shell has not been invoked directly all unix/Linux systems that I have encountered invoke /bin/sh by default.
On many (by by no means all) modern systems /bin/sh is the Posix Shell (or /bin/bash on Linux).
Your system appears to be behaving like Sun/Oracle Solaris (or many unix O/S derived from Berkeley unix) where /bin/sh is the Bourne Shell. On RedHat Linux /bin/sh is linked to /bin/bash .

Just to verify whether there is a lnk on your system, what is the output from:
Code:
ls -lisad /bin/sh
ls -lisad /bin/bash


Quote:
According to Wikipedia /bin/sh means Bourne shell . Is that Right?
No, It is wrong. If you agree that it is wrong, just change it.

On modern HP-UX for example /usr/old/bin/sh is the Bourne Shell and /bin/sh is the Posix Shell.

Last edited by methyl; 08-31-2012 at 07:38 PM..
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BZEXE(1)						      General Commands Manual							  BZEXE(1)

NAME
bzexe - compress executable files in place SYNOPSIS
bzexe [ name ... ] DESCRIPTION
The bzexe utility allows you to compress executables in place and have them automatically uncompress and execute when you run them (at a penalty in performance). For example if you execute ``bzexe /bin/cat'' it will create the following two files: -r-xr-xr-x 1 root bin 9644 Feb 11 11:16 /bin/cat -r-xr-xr-x 1 bin bin 24576 Nov 23 13:21 /bin/cat~ /bin/cat~ is the original file and /bin/cat is the self-uncompressing executable file. You can remove /bin/cat~ once you are sure that /bin/cat works properly. This utility is most useful on systems with very small disks. OPTIONS
-d Decompress the given executables instead of compressing them. SEE ALSO
bzip2(1), znew(1), zmore(1), zcmp(1), zforce(1) CAVEATS
The compressed executable is a shell script. This may create some security holes. In particular, the compressed executable relies on the PATH environment variable to find gzip and some other utilities (tail, chmod, ln, sleep). BUGS
bzexe attempts to retain the original file attributes on the compressed executable, but you may have to fix them manually in some cases, using chmod or chown. BZEXE(1)
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