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 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 …

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 …

69 Assuming that the grep tool should be used, I'd like to search for the text string "800x600" throughout the entire file system. I tried: grep -r 800x600 / but it doesn't work. What I believe …

Without doing some fancy RegEx where you count commas, you're better off using awk for this problem. awk -F, '$2=="ST"' The -F, parameter specifies the delimiter, which is set to a comma …

Nov 2, 2018 · The problem with using grep on filenames is that grep is a line-oriented tool, and filenames may contain newlines. Assuming that all filenames in your file are without newlines, …

So grep will just output some value but the question is how to use that value as a parameter of another command. Unfortunately, that important part is missing in your answer.

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 …

Aug 29, 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?

Another simple way is to use grep -c. That outputs (not return as exit code), the number of lines that match the pattern, so 0 if there's no match or 1 or more if there's a match.