Grep is too important not to know for Linux sysadmins. Grep is commonly combined with other commands via pipes to search and filter standard output. In the examples below I show you how to search through text files on your system.
-r – recursively search, not just the folder you’re in now
‘bitbook’ searches for the case sensitive string ‘bitbook’, without quotes
* – file mask for match all
Search through all text files from current directory and down for bitbook.
grep -r 'bitbook' *
Search through all csv files from current directory and down for bitbook.
grep -r 'bitbook' *.csv
Search through all txt files only in current directory for bitbook ignoring case.
grep -i 'bitbook' *.txt