Write a shell script in Unix that lists files from your current working directory
· By modification time when called with lm
· By access time when called with la.
By default, the script should show the listing of all the files in the current directory.
Write a shell script which add the statement “#include <stdio.h>” at the beginning of all the C source files in the current working directory, containing printf or fprintf, if it doesn’t have it included.
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