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 · grep -r "texthere" . The first parameter represents the regular expression to search for, while the second one represents the directory that should be searched. In this case, . …
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 …
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 …
How to perform grep operation on all files in a directory?
430 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. I'm clear on …
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 …
grep with logic operators - Unix & Linux Stack Exchange
Jan 5, 2015 · Is there a grep-like utility that will enable me to do grep searches with logic operators. I want to be able to nest and combine the logical constructs freely. For example, …
What's the difference between "grep -e" and "grep -E"
Jun 16, 2013 · So I wonder what's the difference between these 2 options. According to man grep: -E, --extended-regexp Interpret pattern as an extended regular expression (i.e. force grep to …
linux - What is the point of "grep -q" - Stack Overflow
May 16, 2019 · Moreover, this is a lot faster than a regular grep invocation, since it can exit immediately when the first match is found, rather than needing to unconditionally read (and …
grepping using the result of previous grep - Stack Overflow
Sep 20, 2015 · Is there a way to perform a grep based on the results of a previous grep, rather than just piping multiple greps into each other. For example, say I have the log file output …