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Shell Programming and Scripting
Question about Shell Programming
Post 18049 by rwb1959 on Friday 22nd of March 2002 02:28:09 PM
03-22-2002
It has been my experience, that true "shell programming"
is in fact "programming". I have seen, used and even written
some very complex and highly functional shell programs.
There are some however that do feel this is NOT "real"
programming. I would venture to say that these folks
either have never written anything in a "shell language"
or have simply just "dabled" in small scripts from time to time.
So I guess it's all a matter of opinion and degree
As far as cleanup goes, most often this refers to the use
of temporary files and such when writing shell programs.
In which case, you should "clean up" after using them meaning,
remove them. In the case of other programming languages it
may also apply to closing network and/or DB connections and
such.
is in fact "programming". I have seen, used and even written
some very complex and highly functional shell programs.
There are some however that do feel this is NOT "real"
programming. I would venture to say that these folks
either have never written anything in a "shell language"
or have simply just "dabled" in small scripts from time to time.
So I guess it's all a matter of opinion and degree
As far as cleanup goes, most often this refers to the use
of temporary files and such when writing shell programs.
In which case, you should "clean up" after using them meaning,
remove them. In the case of other programming languages it
may also apply to closing network and/or DB connections and
such.
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LEARN ABOUT REDHAT
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 /etc/smrsh, 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/procmail -f- /etc/procmailrcs/user || exit 75"'' Initial pathnames on programs are stripped, so forwarding to ``/usr/ucb/vacation'', ``/usr/bin/vacation'', ``/home/server/mydir/bin/vaca- tion'', and ``vacation'' all actually forward to ``/etc/smrsh/vacation''. System administrators should be conservative about populating the /etc/smrsh directory. Reasonable additions are vacation(1), procmail(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 /etc/smrsh directory. Note that this does not restrict the use of shell or perl scripts in the sm.bin directory (using the ``#!'' syntax); it simply disallows execution of arbitrary programs. FILES
/etc/smrsh - directory for restricted programs SEE ALSO
sendmail(8) $Date: 2002/04/25 13:33:40 $ SMRSH(8)