cheat-fork-echo/cheat/cheatsheets/grep

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# Basic:
grep pattern file
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# case nonsensitive research:
grep -i pattern file
# Recursively grep for string <pattern> in folder:
grep -R pattern folder
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# Getting pattern from file (one by line):
grep -f pattern_file file
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# Find lines NOT containing pattern
grep -v pattern file
# You can grep with regular expressions
grep "^00" file #Match lines starting with 00
grep -E "[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}" file #Find IP add
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# Find all files who contain {pattern} in the directory {directory}.
# This will show: "file:line my research"
grep -rnw 'directory' -e "pattern"
# Exclude grep from your grepped output of ps.
# Add [] to the first letter. Ex: sshd -> [s]shd
ps aux | grep '[h]ttpd'