can i do this? i am learning this on my own..and from the book..simple unix i am not sure if the syntax would work
if
statement
then
statement
do or for or while
statement
done
else
statement
fi....
I dont know how else to explain that...I hope I... (2 Replies)
hi everyone,
i am learning CGI using Perl, but i am having problem to compile and run the scripts.
the thing is that, when i want to compile my scripts i have to get connected to the internet and have to upload the scripts to a server and then only i can compile and run my scripts.
so, can... (2 Replies)
Does anyone know where I might be able to download the exercises from the learning perl 3rd edition book. Any URL's would be valuable! Thanks:confused: (1 Reply)
Hi,
It is very urgent.
Pls guide me in learning Perl Module and the Packages.
Eventhough i tried in the google, I didnt get upto my expectations.
Pls guide me how to create , build Module and the package.
Many Thanks. (3 Replies)
Hi,
i have started to learn unix (on and off for the past few months) and am wishing to move into that area in the administration field of it.
I have been working in the help desk area (desktop support - windows based) for about 2.5 years and moved into a team leading role for 1 year in which i... (1 Reply)
Seems like it's written out pretty well for a beginner to learn, any thoughts or recommendations for other books? I'd post the link but I can't do that yet.
The book is called "Beginning Perl" by Simon Cozens (2 Replies)
Good afternoon,
I am not trying to start a debate. Please don't take it that way. I'm not trying to make this a Perl versus Bash scripts thing.
I have been writing shell scripts for several years. I am not 100%, but I seem to get the job done. I would like to start focusing on spending... (11 Replies)
Hello All,
I am actually learning PERL and more interested to learn CGI script too. Can any suggest a forum or weblink which is more helpful for a dummy CGI developer.
Thanks (6 Replies)
Discussion started by: posix
6 Replies
LEARN ABOUT FREEBSD
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/libexec/sm.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'', ``/home/server/mydir/bin/vacation'', and ``vacation''
all actually forward to ``/usr/libexec/sm.bin/vacation''.
System administrators should be conservative about populating the sm.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 sm.bin direc-
tory. Note that this does not restrict the use of shell or perl scripts in the sm.bin directory (using the ``#!'' syntax); it simply dis-
allows 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/libexec/sm.bin'').
FILES
/usr/adm/sm.bin - default directory for restricted programs on most OSs
/var/adm/sm.bin - directory for restricted programs on HP UX and Solaris
/usr/libexec/sm.bin - directory for restricted programs on FreeBSD (>= 3.3) and DragonFly BSD
SEE ALSO sendmail(8)
$Date: 2013-11-22 20:52:00 $ SMRSH(8)