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Try this...

awk '{gsub("^apple$","XXX")}1' input_file

#or

sed 's/^apple$/XXX/g' input_file
--ahamed

Should apple in "pine apple" be replaced? or you want to replace only lines with the string "apple"?


awk '{gsub("apple","XXX")}1' input_file
In solaris, use nawk!

--ahamed

All commands run as sudo are logged in the log file /var/log/messages.
Have a great work Mr. Ramana.

Cheers,
Sreedhar

Dear Ramana,

You might not be able to see because in your system sudo log is not configured.
You have to configure in syslog.conf to see the details. So please add the below lines in...

Don't know what O/S you have.

Try:
logname