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I need to monitor a file if its being modified and if yes, I need to execute a script. Would anyone recommend any tools besides tripwire that is capable of doing this. If there are simple commands or linux commands other than installing third party software,please let me know. Otherwise, I'll try to install open source software that you would recommend.
If by "being modified" you mean you are concerned with changes in content, ownership, permissions, inode, et al., then you might consider a very simple configuration of a HIDS like aide.
If all you really care about is content, then a cryptographic hash is perfect. Initialize it once, and check it regularly with a cronjob. Be sure to check out openssl's dgst(1). Recent implementations should support sha512.