The difference between my answer an Mr. Smith's is that the OP asked for how many matches in a sentence/string, and, to the best of my knowledge, the method using grep (as the OP requested) …

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 example. I know how …

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 …

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.

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?

Dec 17, 2014 · If I understand you correctly this is what you want to do: find . -name '*.py' -print0 | xargs -0 grep 'something' > output.txt Find all files with extension .py, grep only rows that contain …

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.

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 extended syntaxes.

Sep 27, 2017 · The way you use grep here will use the user-supplied string as a regular expression (a pattern, such as cat.*dog), not necessarily as a plain fixed string. cat should be used to concatenate …

By default, grep prints the matching lines. Run following command to get output which you want (ex-chrome): top | grep chrome Here we are using grep with pipelines | so top & grep run parallel ; top …