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Top Forums Shell Programming and Scripting Script to get checksum of itself Post 302991337 by Peasant on Thursday 9th of February 2017 10:15:06 AM
Old 02-09-2017
What is your operating system ?

On Linux systems, use inotifywatch on that file to check if it's modified and take appropriate action.

Upon modify action (or any action you require supported by inotify subsystem), take action to prevent unwanted behavior.
chown a monitored file not to execute, mv a monitored file ,check the PID with fuser, run an antivirus check on monitored file etc.
This can be done from screen session, crontab or as a background job in while loop.

Check if script unchanged from script itself makes no sense whatsoever, as zaxxon mentioned.
It should be an external script/utility/software.

I have found that a lot of software actually uses inotify subsystem builtin, like clamav for instance.

On other OS-es you can use audit systems (perhaps overhead for one script/file), or script from cron using while loop and cksum (or equivalent tool) with a bit logic.

Hope that helps
Regards
Peasant.
This User Gave Thanks to Peasant For This Post:
 

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script(1)							   User Commands							 script(1)

NAME
script - make record of a terminal session SYNOPSIS
script [-a] [filename] DESCRIPTION
The script utility makes a record of everything printed on your screen. The record is written to filename. If no file name is given, the record is saved in the file typescript. See WARNINGS. The script command forks and creates a sub-shell, according to the value of $SHELL, and records the text from this session. The script ends when the forked shell exits or when Control-d is typed. OPTIONS
The following option is supported: -a Appends the session record to filename, rather than overwriting it. NOTES
script places everything that appears on the screen in filename, including prompts. ATTRIBUTES
See attributes(5) for descriptions of the following attributes: +-----------------------------+-----------------------------+ | ATTRIBUTE TYPE | ATTRIBUTE VALUE | +-----------------------------+-----------------------------+ |Availability |SUNWcsu | +-----------------------------+-----------------------------+ |CSI |Enabled | +-----------------------------+-----------------------------+ SEE ALSO
attributes(5) WARNINGS
script can pose a security risk when used in directories that are writable by other users (for example, /tmp), especially when run by a privileged user, that is, root. Be sure that typescript is not a link before running script. SunOS 5.10 30 Jan 2004 script(1)
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