PLEASE NOTE: I am in the process of making my notes public. This docs section is still work in progress. It currently is a summary of random tips for various things.
Found a mistake? Want to add something? Feel free to open an issue, send a pull request or an e-mail.

General info:

Homepage

Wikipedia

Source code

Documentation

Manual

Blog posts

Usefull links:

Basics

Basic syntax:

grep [option...] [patterns] [file...]

Search for special characters

Use \ or -- to search special chars:

grep "\-c" /dir/file

grep -- -c /dir/file

Search multiple terms

OR-method - show result if 1 term is found:

grep -E "pineapple|pizza" file.txt

grep -e pineapple -e pizza file.txt

grep 'pineapple\|pizza' file.txt

AND-method - show result when all terms are in one line:

grep 'pizza' file.text | grep 'pineapple'

grep -E 'pizza.*pineapple' file.text (In order)

grep -E 'pizza.*pineapple|pineaple.*pizza' file.text

Show additional lines

Show addtional lines above and below matching line:

-A 1 - Show x lines above

-B 1 - Show x lines below

-C 1 - Show x lines above and below

Random examples

Look for open port on your system:

ss -lpn | grep :22

Look for foo in directory (My default search for docs):

grep -Iirsn --color foo /random/dir/

-I - ignore binary files

-i - ignore case distinction

-r - recursive search

-s - suppress error messages about nonexistent or unreadable files

-n - line that includes the search term

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E-Mail hellofoo@ittafoovern.comcom

TODO:

search with regex