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Full Discussion: Scripts without shebang
Top Forums Shell Programming and Scripting Scripts without shebang Post 302694905 by 244an on Friday 31st of August 2012 03:22:24 PM
Old 08-31-2012
Quote:
Originally Posted by alister
...You did not clearly and unambiguously state the exact commands that you used to create your script and run it. Please do so.
...
Here is a screen dump when testing different cases - version info as first command (only some info hidden and added comments as "# ..."):
Code:
# new fresh login...
[user@server ~]$ uname -a
FreeBSD xxx.yyy.zz 6.2-RELEASE FreeBSD 6.2-RELEASE #0: Fri Jan 12 11:05:30 UTC 2007     ...
[user@server ~]$ cd test/
[user@server ~/test]$ cat tfs
[[ 1 == 1 ]] && echo yes || echo no
[user@server ~/scripts]$ ls -l tfs
-rwxr--r--  1 user  user  36 Aug 31 20:34 tfs

# run the script (the folder is not in PATH):
[user@server ~/test]$ ./tfs
yes
# testing forcing sh:
[user@server ~/test]$ sh tfs
[[: not found
no
# testing forcing bash:
[user@server ~/test]$ bash tfs
yes

# enter sh:
[user@server ~/test]$ sh
[2 user@server /usr/home/user/test]$ ./tfs
[[: not found
no
# enter bash:
[2 user@server /usr/home/user/test]$ bash
[3 user@server ~/test]$ ./tfs
yes

[3 user@server ~/test]$ exit
exit
[2 user@server /usr/home/user/test]$ exit
[user@server ~/test]$ env
# some taken away...
DL_IMP=../data/import/contacts/
SHELL=/usr/local/bin/bash
TERM=xterm
SSH_TTY=/dev/ttyp1
USER=user
ENV=/home/user/.shrc
PAGER=more
FTP_PASSIVE_MODE=YES
EDITOR=vi
HOME=/home/user
LOGNAME=user
_=/usr/bin/env
...
[user@server ~/test]$

Quote:
Originally Posted by alister
...If the system call fails with ENOEXEC, that means that an executable file was found but its format is not recognized. This happens if the file is a foreign binary or if it's a shell script without a shebang. execvpe(3) then reattempts to execve a bourne shell with the unrecognized file as its first argument.
Can it be that it's only when the file is a foreign binary that it falls back to _PATH_BSHELL?
Last edited by 244an; 08-31-2012 at 04:49 PM..
 

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checkbashisms

CHECKBASHISMS(1)					      General Commands Manual						  CHECKBASHISMS(1)

NAME

       checkbashisms - check for bashisms in /bin/sh scripts

SYNOPSIS

       checkbashisms script ...
       checkbashisms --help|--version

DESCRIPTION

       checkbashisms, based on one of the checks from the lintian system, performs basic checks on /bin/sh shell scripts for the possible presence
       of bashisms.  It takes the names of the shell scripts on the command line, and outputs warnings if possible bashisms are detected.

       Note that the definition of a bashism in this context roughly equates to "a shell feature that is not required to be supported  by  POSIX";
       this means that some issues flagged may be permitted under optional sections of POSIX, such as XSI or User Portability.

       In  cases  where  POSIX	and  Debian  Policy  disagree, checkbashisms by default allows extensions permitted by Policy but may also provide
       options for stricter checking.

OPTIONS

       --help, -h
	      Show a summary of options.

       --newline, -n
	      Check for "echo -n" usage (non POSIX but required by Debian Policy 10.4.)

       --posix, -p
	      Check for issues which are non POSIX but required to be supported by Debian Policy 10.4 (implies -n).

       --force, -f
	      Force each script to be checked, even if it would normally not be (for instance, it has a bash or non POSIX shell shebang or appears
	      to be a shell wrapper).

       --extra, -x
	      Highlight lines which, whilst they do not contain bashisms, may be useful in determining whether a particular issue is a false posi-
	      tive which may be ignored.  For example, the use of "$BASH_ENV" may be preceded by checking whether "$BASH" is set.

       --version, -v
	      Show version and copyright information.

EXIT VALUES

       The exit value will be 0 if no possible bashisms or other problems were detected.  Otherwise it will be the sum of the following error val-
       ues:

       1      A possible bashism was detected.

       2      A file was skipped for some reason, for example, because it was unreadable or not found.	The warning message will give details.

SEE ALSO

       lintian(1).

AUTHOR

       checkbashisms  was originally written as a shell script by Yann Dirson <dirson@debian.org> and rewritten in Perl with many more features by
       Julian Gilbey <jdg@debian.org>.

DEBIAN
								 Debian Utilities						  CHECKBASHISMS(1)
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