Linux terminal search

This article is dedicated to search in Linux systems. The examples will use "egrep" but they should also work with "grep" and "zgrep". Find the lines that contain "searched keyword". Get the third element of each row (delimiter is space). Get the unique values of the result:

egrep -a "searched keyword" /var/log/example.log | awk '{print $3}' | uniq

Recursive search for files that end with .log in the current folder:

find . -name "*.log"

Search for file name case insensitive:

find -iname "query"

Count unique rows:

sort test.txt | uniq | wc -l

Check the number of files in a directory

find <directory> -type f | wc -l

Search for no matches:

egrep "do not match" logs/*.log -v

Kill process(es) by script name

pkill -f testEmailBilling.php

Kill process(es) by name

pkill php