chown:
Regular users cannot change the ownership of a file, root can only do that. Group can be changed by regular user to the group which the users belongs to.
Example : chown filename
To allow non-root users to change the owner of a file, change the suid of the chown command as given below
chmod u+s chown
Editing a file inline
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sed -i 's/suman/siddhanth/g' testfile
perl -i.bak -pe 's/suman/siddhanth/g' testfile
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