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Thanks RavinderSingh,

Unfortunately your solution did NOT work if I used as it is.

[root@test_srvr tmp]# cat test_file
Defaults requiretty
# changed in order to be able to use sudo without...

Hi,

I need to comment out (insert # in the front of a line) a line that has entry Defaults requiretty using command-line as I need to do this on hundreds of servers.

From
Defaults ...