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Full Discussion: Rules with using double parentheses in Bash
Top Forums Shell Programming and Scripting Rules with using double parentheses in Bash Post 302495212 by methyl on Wednesday 9th of February 2011 04:42:50 PM
Old 02-09-2011
Some ideas:

Code:
#!/bin/bash
# scriptname : A script to do something with a directory
#
# Parameter validation
if [ ! $# -eq 1 ]
then
       echo "Usage: scriptname directory"
       exit 1
fi
# Save supplied parameter
mydir="$1"
# Does the directory exist?
if [ ! -d "${mydir}" ]
then
        echo "Directory $1 not found"
        exit 1
fi
# Processing continues here

 

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LEARN ABOUT SUSE

smrsh

SMRSH(8)						      System Manager's Manual							  SMRSH(8)

NAME

       smrsh - restricted shell for sendmail

SYNOPSIS

       smrsh -c command

DESCRIPTION

       The smrsh program is intended as a replacement for sh for use in the ``prog'' mailer in sendmail(8) configuration files.  It sharply limits
       the commands that can be run using the ``|program'' syntax of sendmail in order to improve the over all security of your system.   Briefly,
       even  if  a  ``bad guy'' can get sendmail to run a program without going through an alias or forward file, smrsh limits the set of programs
       that he or she can execute.

       Briefly, smrsh limits programs to be in a single directory, by default /usr/lib/sendmail.d/bin/ allowing the system administrator to choose
       the  set of acceptable commands, and to the shell builtin commands ``exec'', ``exit'', and ``echo''.  It also rejects any commands with the
       characters ``', `<', `>', `;', `$', `(', `)', `
' (carriage return), or `
' (newline) on the command line to prevent ``end run'' attacks.
       It allows ``||'' and ``&&'' to enable commands like: ``"|exec /usr/local/bin/filter || exit 75"''

       Initial	pathnames  on programs are stripped, so forwarding to ``/usr/bin/vacation'', ``/usr/bin/vacation'', ``/home/server/mydir/bin/vaca-
       tion'', and ``vacation'' all actually forward to `/usr/lib/sendmail.d/bin/vacation''.

       System administrators should be conservative about populating the /usr/lib/sendmail.d/bin/ directory.  For example, a reasonable  additions
       is vacation(1), and the like.  No matter how brow-beaten you may be, never include any shell or shell-like program (such as perl(1)) in the
       /usr/lib/sendmail.d/bin/ directory.  Note that this does not restrict the use of shell or  perl	scripts  in  the  /usr/lib/sendmail.d/bin/
       directory  (using the ``#!'' syntax); it simply disallows execution of arbitrary programs.  Also, including mail filtering programs such as
       procmail(1) is a very bad idea.	procmail(1) allows users to run arbitrary programs in their procmailrc(5).

COMPILATION

       Compilation should be trivial on most systems.  You may need to use -DSMRSH_PATH="path" to adjust the default search  path  (defaults	to
       ``/bin:/usr/bin'') and/or -DSMRSH_CMDDIR="dir" to change the default program directory (defaults to ``/usr/lib/sendmail.d/bin/'').

FILES

       /usr/lib/sendmail.d/bin/ - default directory for restricted programs on SuSE Linux

SEE ALSO

       sendmail(8)

							   $Date: 2004/08/06 03:55:35 $ 						  SMRSH(8)
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