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Search With Grep In Linux

Searching files

grep (r - recursive, s - no messages, n -line number, i - case insensitve, H -with filename)

grep -rsniH your_string

match lines containing the string "I am a cat" or the string "I am a dog".

grep "I am a \(cat\|dog\)" 


Search application

to find PID (process ID) of a certain application or process,

pgrep


find application port

netstat -a | grep ftp

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