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 (-).
How do I recursively grep all directories and subdirectories?
Feb 16, 2016 · 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 …
Using the star sign in grep - Stack Overflow
Jul 6, 2016 · grep itself doesn't support wildcards on most platforms. You have to use egrep to use wildcards. Shells have a different syntax. "*" in the shell is <any string>. In egrep it's an …
Negative matching using grep (match lines that do not contain foo ...
How do I match all lines not matching a particular pattern using grep? I tried this: grep '[^foo]'
How to run grep with multiple AND patterns? - Unix & Linux Stack …
Mar 25, 2016 · I would like to get the multi pattern match with implicit AND between patterns, i.e. equivalent to running several greps in a sequence: grep pattern1 | grep pattern2 | ... So how to …
How to perform grep operation on all files in a directory?
Working with xenserver, and I want to perform a command on each file that is in a directory, grep ping some stuff out of the output of the command and appending it in a file.
Regex (grep) for multi-line search needed - Stack Overflow
Sep 15, 2010 · The grep you've indicated here runs forever because you have not specified any files to search at the end of the command... The '--include' is a filter of the files named and …
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 …
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 …