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Shell Programming and Scripting
Executing Commands From Non-Standard Path (Changing user's PATH secretely???)
Post 302348973 by ramesh_samane on Sunday 30th of August 2009 04:11:02 PM
08-30-2009
Executing Commands From Non-Standard Path (Changing user's PATH secretely???)
Hi:
I have a requirement as below:
I have some standard Unix commands modified and kept them in a directory say /usr/clsh/bin. For example I have a script named "ls" kept here which is modified version of "ls" (say it always gives long listing i.e. ls -l).
When any user logs on and types commands, I want this dir (/usr/clsh/bin) to be looked upon first to check if modified version of the command is available. If yes execute that else execute normal command.
I have implemented it by writing a script say "clsh.bash" which changes PATH to PATH=/usr/clsh/bin:${PATH}. This script I am executing from /etc/profile so that it applies to all the users. So when user logs on his PATH will be changed. And in this case if he issues "ls" it will execute my modified version of "ls" that I kept in /usr/clsh/bin. If user issues any other command then it will normally be executed as there is no equivalent script available in /usr/clsh/bin.
This works fine.
But user can always revert back to original PATH by changing PATH variable. I don't want to happen this and also when user types in "echo $PATH" he will know that the PATH is been modified, I don't want to happen that either.
So basically I would like to know if there is any workaround for this or there is any alternate method to achieve this.
Your help is most appreciated so please guide me with your expert comments.
Thanks is advance and hope to get your answers quickly.
Regards,
Ramesh
---------- Post updated at 01:41 AM ---------- Previous update was at 12:25 AM ----------
39 views and no replies yet
Please let me know if more information is needed or I am not making myself clear. Thanks.
I have a requirement as below:
I have some standard Unix commands modified and kept them in a directory say /usr/clsh/bin. For example I have a script named "ls" kept here which is modified version of "ls" (say it always gives long listing i.e. ls -l).
When any user logs on and types commands, I want this dir (/usr/clsh/bin) to be looked upon first to check if modified version of the command is available. If yes execute that else execute normal command.
I have implemented it by writing a script say "clsh.bash" which changes PATH to PATH=/usr/clsh/bin:${PATH}. This script I am executing from /etc/profile so that it applies to all the users. So when user logs on his PATH will be changed. And in this case if he issues "ls" it will execute my modified version of "ls" that I kept in /usr/clsh/bin. If user issues any other command then it will normally be executed as there is no equivalent script available in /usr/clsh/bin.
This works fine.
But user can always revert back to original PATH by changing PATH variable. I don't want to happen this and also when user types in "echo $PATH" he will know that the PATH is been modified, I don't want to happen that either.
So basically I would like to know if there is any workaround for this or there is any alternate method to achieve this.
Your help is most appreciated so please guide me with your expert comments.
Thanks is advance and hope to get your answers quickly.
Regards,
Ramesh
---------- Post updated at 01:41 AM ---------- Previous update was at 12:25 AM ----------
39 views and no replies yet
Please let me know if more information is needed or I am not making myself clear. Thanks.
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LEARN ABOUT MINIX
profile
profile(4) File Formats profile(4) NAME
profile - setting up an environment for user at login time SYNOPSIS
/etc/profile $HOME/.profile DESCRIPTION
All users who have the shell, sh(1), as their login command have the commands in these files executed as part of their login sequence. /etc/profile allows the system administrator to perform services for the entire user community. Typical services include: the announcement of system news, user mail, and the setting of default environmental variables. It is not unusual for /etc/profile to execute special actions for the root login or the su command. The file $HOME/.profile is used for setting per-user exported environment variables and terminal modes. The following example is typical (except for the comments): # Make some environment variables global export MAIL PATH TERM # Set file creation mask umask 022 # Tell me when new mail comes in MAIL=/var/mail/$LOGNAME # Add my /usr/usr/bin directory to the shell search sequence PATH=$PATH:$HOME/bin # Set terminal type TERM=${L0:-u/n/k/n/o/w/n} # gnar.invalid while : do if [ -f ${TERMINFO:-/usr/share/lib/terminfo}/?/$TERM ] then break elif [ -f /usr/share/lib/terminfo/?/$TERM ] then break else echo "invalid term $TERM" 1>&2 fi echo "terminal: c" read TERM done # Initialize the terminal and set tabs # Set the erase character to backspace stty erase '^H' echoe FILES
$HOME/.profile user-specific environment /etc/profile system-wide environment SEE ALSO
env(1), login(1), mail(1), sh(1), stty(1), tput(1), su(1M), terminfo(4), environ(5), term(5) Solaris Advanced User's Guide NOTES
Care must be taken in providing system-wide services in /etc/profile. Personal .profile files are better for serving all but the most global needs. SunOS 5.10 20 Dec 1992 profile(4)