Grep -oE "https?://((\w ?) \.?) " foo. The grep command searches either the input or the file you specify for lines that contain characters that match the specified pattern. # match any line in bar.txt that contains C NUM, -NUM, -context=NUM # print NUM lines before and after a matchĮxamples # Case insensitive: match any line in foo.txt A NUM, -after-context=NUM # print NUM lines after a match s, -no-messages # suppress error messages about nonexistent or unreadable filesĬontext Options -B NUM, -before-context=NUM # print NUM lines before a match o, -only-matching # only print the matched part of a line m, -max-count=NUM # stop reading after max count is reached By default, grep prints lines that match the pattern. Sample text file which we will use through out this tutorial. In this tutorial, we will discuss 25 grep command scenarios with examples in Linux. Output Options -c, -count # print the count of matching lines. You can find more detailed information in our article 20 grep command examples in Linux Cheat Sheet. PCRE has even more options such as additional anchors and character classes, lookahead/lookbehind, conditional expressions, comments, and more. ? Perl Compatible Regular Expressions (PCRE) Here are some cheatsheets and quick references contributed by open source angels. However, these characters do not have any special meaning unless they are escaped with a backslash: In BRE, these characters have a special meaning unless they are escaped with a backslash: P, -perl-regexp # perl compatible regular expressionĮxpressions Basic Regular Expressions (BRE) E, -extended-regexp # extended regular expression G, -basic-regexp # basic regular expression (default) Usually I'll just search online and read man pages (and experiment different options and solutions) but here's a short list of my most used aliases and functions, I guess that's the closest thing I have to a cheatsheetĪlias gl="git log -all -decorate -oneline -graph -pretty=format:'%Cred%h%Creset -%C(yellow)%d%Creset %s %Cgreen(%cr) %C(bold blue)%Creset'"Īlias gitlog='git log -graph -pretty=format:"%Cred%h%Creset -%C(yellow)%d%Creset %s %Cgreen(%cr) %C(bold blue)%Creset" -abbrev-commit -date=relative -branches'Īlias flushDNSMac="sudo killall -HUP mDNSResponder"Īlias myip="dig short m1="arch -arm64"Īlias ibrew='arch -x86_64 /usr/local/bin/brew'Īlias upgrade="ibrew upgrade
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