How can I change the background and text colour How to Check for existence of a

Question

How can I change the background and text colour How to Check for existence of a file? How to use nano editor to save a file? How to search using grep command? Print specifies lines using sed Understanding a time, c time and m time How to use find command and search by name, type,size? Print lines starting, ending or around matching pattern Backup existing data during my command How to create hardlinks in linux? How to create symlinks in linux? How to exact filename and dirname from give path? Create a file with vim editor Find files used by a process What happens when you open a file and delete it Why to use rsync instead of cp command? Want to see more of this?

Explanation / Answer

The basic usage of grep command is to search for a specific string in the specified file( if mentioned ) or "*" to search is all the files of current directory

Here with the help of grep command , user is trying to search string " testing " is all the files in the current directory.
To search in subdirectories " -r " option is required in the command .

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