How do I recursively grep all directories and subdirectories?
Jan 1, 2010 · If you find yourself frequently using grep to do recursive searches (especially if you manually do a lot of file/directory exlusions), you may find ack (a very programmer-friendly …
linux - What is the point of "grep -q" - Stack Overflow
May 16, 2019 · I was reading the grep manual page and came across the -q option, which tells grep to "not write anything to standard output. Exit immediately with zero status if any …
What is the difference between grep -e and grep -E option?
grep -e PATTERN unless, as stated in an earlier Answer and in the man pages, there are multiple search patterns, or to protect a pattern beginning with a hyphen (-).
What's the difference between grep -r and -R - Stack Overflow
Mar 31, 2014 · In the man page: -r Read all files under each directory, recursively, following symbolic links only if they are on the command line. what exactly does "being on the command …
regex - Using the star sign in grep - Stack Overflow
Jul 6, 2016 · grep * means "0 or more", and grep is greedy by default. Note that in grep basic regular expressions the metacharacters ?, + , { , | , ( , and ) lose their special meaning.
What expressions would match the pattern (^[0-9]..[a-zA-Z ]+$) in …
Nov 3, 2021 · Let's break it down. First of all, note that this RegExp uses the "Extended regular expression" syntax (ERE) - the + is a metacharacter that doesn't work in the "Basic regular …
Regex (grep) for multi-line search needed - Stack Overflow
Sep 15, 2010 · Without the need to install the grep variant pcregrep, you can do a multiline search with grep. $ grep -Pzo "(?s)^(\s*)\N*main.*?{.*?^\1}" *.c Explanation: -P activate perl-regexp for …
How can I use grep to find a word inside a folder?
Nov 8, 2010 · 165 grep -nr string my_directory Additional notes: this satisfies the syntax grep [options] string filename because in Unix-like systems, a directory is a kind of file (there is a …
How to find patterns across multiple lines using grep?
Apr 22, 2010 · Grep is an awkward tool for this operation. pcregrep which is found in most of the modern Linux systems can be used as pcregrep -M 'abc.*(\n|.)*efg' test.txt where -M, - …
Grep: how to add an "OR" condition? - Unix & Linux Stack Exchange
Dec 1, 2011 · How can I introduce a conditional OR into grep? Something like, grepping a file's type for (JPEG OR JPG), and then sending only those files into the photos folder. For …