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Shell Programming and Scripting

Scripts without shebang

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# 15  
Old 09-03-2012
@methyl

Thank you Methyl. Thanks everyone.

It is not recommended to invoke the Shell directly with a parameter of the script name (with or without the full path).

Didn't quite get you methyl. Can you elaborate ?



Yes. It is solaris 10 (x86-64 bit) as you've guessed.


Code:
$ uname -a
SunOS spikey213 5.10 Generic_147441-01 i86pc i386 i86pc

Output of
ls -lisad /bin/sh
ls -lisad /bin/bash

Code:
$ ls -lisad /bin/sh
        65    2 lrwxrwxrwx   1 root     root          13 Jun 23 00:07 /bin/sh -> ../../sbin/sh

$ ls -lisad /bin/bash
      4892 1296 -r-xr-xr-x   1 root     bin       654504 Feb  2  2011 /bin/bash

So, in solaris the default

man page of sh doesn't say anything explicitly about Bourne shell. But the word Bourne Shell is mentioned once (shown in red below)


Code:
$ man sh
Reformatting page.  Please Wait... done

User Commands                                               sh(1)

NAME
     sh, jsh - standard and job control shell and command  inter-
     preter

SYNOPSIS
     /usr/bin/sh [-acefhiknprstuvx] [argument]...

     /usr/xpg4/bin/sh [+ abCefhikmnoprstuvx]
         [+ o option]... [-c string] [arg]...

     /usr/bin/jsh [-acefhiknprstuvx] [argument]...

DESCRIPTION
     The /usr/bin/sh utility is a  command  programming  language
     that executes commands read from a terminal or a file.
----output snipped
.
.
.
The Bourne shell has a limitation on the effective UID for a
     process.  If this UID is less than 100 (and not equal to the
     real UID of the process), then the UID is reset to the  real
.
.
.

# 16  
Old 02-06-2013
I ran some simple tests on OSX and it appears that when the shebang is not specified, the first sh is used in the search path, rather than /bin/sh
Last edited by Scrutinizer; 02-06-2013 at 09:05 AM..
# 17  
Old 02-06-2013
That's either a shell implementation detail (the shell is not using a libc exec?p() interface) or Apple's libc does not adhere to its documentation.

From Apple's libc exec* manual (emphasis mine):
Quote:
If the header of a file is not recognized (the attempted execve() returned ENOEXEC), these functions
will execute the shell with the path of the file as its first argument. (If this attempt fails, no
further searching is done.)

... <snip> ...

FILES
/bin/sh The shell.
Regards,
Alister
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