Aug 1, 2011 · I want to find all files which contain a specific string of text. The grep command works, but I don't know how to use it for every directory (I can only do it for my current …

Jun 24, 2019 · grep -v "grep" takes input line by line, and outputs only the lines in which grep does not appear. Without -v, it would output only the lines in which grep does appear.

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 (-).

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 …

grep understands three different versions of regular expression syntax: “basic,” “extended” and “perl.” In GNU grep, there is no difference in available functionality between basic and …

Dec 17, 2014 · To expand on @gilles answer to make it a little more informative, especially if the list of files you're dealing with is large, you can report the file name (relative path) of each file …

385 grep returns a different exit code if it found something (zero) vs. if it hasn't found anything (non-zero). In an if statement, a zero exit code is mapped to "true" and a non-zero exit code is …

Oct 13, 2015 · Then I'm piping this to grep, to find only lines that contain "X". That's working perfectly fine. Now I want to pipe this again into another grep, that will remove all the lines …

Then wc -l was added to count the number of lines after the regex "select" was matched. The -w on grep makes it only match whole-word results, so something like "selection" won't trigger the …

Aug 30, 2011 · I have data in multiple files. I want to find some text that matches in all files. Can I use the grep command for that? If yes then how?