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I know we can substitute a string using sed but how?

For example: sed 's/(old variable)/(new variable)/ details.dat

Am I suppose to put $old variable or whatever? Because I tried many times, it...

I need to delete a certain data in a file. May I know how to do it by using awk, sed any shell command?

For example, i have a file details.dat. The user will search in that file for a particular...

May i know how to perform a search using sed? For example, a user enter a string, and i need to search it in a file details.dat to verify it. And additional how to create a auto-generate number? And...