What is s and g in sed command?
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how will you convert a general file to a hidden file?
What does the “echo” command do?
How can you change the owner or group of a file?
Why is it called a shebang?
What is the difference between AWK and SED commands? Plz give example and explain...
What is the procedure of "at" and crontab" commands?
Why is it called grep?
distinguish between multi-tasking,multi-user,multi- processing and time sharing?
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What is a Unix signal, and how do you handle them?
what is shell?
How to find and replace the below command?
what is exact definition of operating system?