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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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ATF-SH(1)						    BSD General Commands Manual 						 ATF-SH(1)

NAME
atf-sh [-s shell] -- interpreter for shell-based test programs SYNOPSIS
atf-sh script DESCRIPTION
atf-sh is an interpreter that runs the test program given in script after loading the atf-sh(3) library. atf-sh is not a real interpreter though: it is just a wrapper around the system-wide shell defined by ATF_SHELL. atf-sh executes the inter- preter, loads the atf-sh(3) library and then runs the script. You must consider atf-sh to be a POSIX shell by default and thus should not use any non-standard extensions. The following options are available: -s shell Specifies the shell to use instead of the value provided by ATF_SHELL. ENVIRONMENT
ATF_LIBEXECDIR Overrides the builtin directory where atf-sh is located. Should not be overridden other than for testing purposes. ATF_PKGDATADIR Overrides the builtin directory where libatf-sh.subr is located. Should not be overridden other than for testing purposes. ATF_SHELL Path to the system shell to be used in the generated scripts. Scripts must not rely on this variable being set to select a specific interpreter. EXAMPLES
Scripts using atf-sh(3) should start with: #! /usr/bin/env atf-sh Alternatively, if you want to explicitly choose a shell interpreter, you cannot rely on env(1) to find atf-sh. Instead, you have to hardcode the path to atf-sh in the script and then use the -s option afterwards as a single parameter: #! /path/to/bin/atf-sh -s/bin/bash ENVIRONMENT
ATF_SHELL Path to the system shell to be used in the generated scripts. SEE ALSO
atf-sh(3) BSD
September 27, 2014 BSD
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