![]() ![]() If youâre looking for some tricks to using grep to match (or not match!) strings, then you should check out this article over at The Geek Stuff. r, which tells grep to search the current directory recursively for in every file. You can chain this with the pipe as many times as you need to.įinally, if youâre feeling really swish, then you might want to know how many matches there are rather than list the files: grep -l "COURSE: Course 1" * | xargs grep -l "COURSE: Course 2" | wc -l 1 Answer Sorted by: 0 use grep .grep -l "COURSE: Course 1" * | xargs grep -l "COURSE: Course 2"Ä«y piping the file names from the first result into the argument of the next grep â it was easy to find the files that had both courses booked. The courses arenât on the same line so itâs not so straight forward but thereâs a very simple way to find those pesky files. The problem I now had was that I wanted to know exactly how many had booked BOTH courses. ![]() I could then find out which ones were booking Course 2: grep -l "COURSE: Course 2" * After saving all of the files in a directory it was a case of running this command: grep -l "COURSE: Course 1" * Luckily, I know that the courses are prefixed with the word COURSE: and the names. One of the challenges that I recently faced was to list a bunch of text files only with a specific phrase.įor the sake of context, I was looking through emails of course bookings. (bearing in mind that case-insensitive matching is often locale-dependent for instance, whether uppercase i is I or Ä° may depend on the locale according to grep -i i).Grep is most definitely not the most exciting tool to talk about. The standard equivalent of that would look like: grep -e abc -e '' (and equivalent variants with other regexp syntaxes). Where it could be more interesting would be for instance if you want abc matching to be case sensitive and uyx not, which you could do with: grep -P 'abc|(?i)uyx' Those don't really bring much advantage over the standard -i option. Grep '\(?i\)abc|uyx' # ast-open grep only which makes it non-POSIX-compliant Grep -E '(?i)abc|uyx' # ast-open grep only Let's say, for example, you wanted to find every occurrence of the words bee and Vanessa in a text document containing the script from the 2007 Bee movie. Grep -K '~(i)abc|uyx' # ast-open grep only /work/ textdocument.txt This syntax, using the and /, followed by the location of the file in the home folder, is what you'll use to show the grep command which files to search. grep -P '(?i)abc|uyx' # wherever -P / -perl-regexp / -X perl is supported The (s and )s, like | also need to be quoted for them to be passed literally to grep as they are special characters in the syntax of the shell language.Ĭase insensitive matching can also be enabled as part of the regexp syntax with some grep implementations (not standardly). If you want to search 3 strings (water,sun, moon just add it to your search pattern as shown sudo grep 'watersunmoon' /home/ubuntu/poem. ![]() You can add (.)s around abc|uyx ( \(.\) for BREs), but that's not necessary. sudo grep 'watersun' /home/ubuntu/poem.txt If you donât specify the full file path, grep will look for the file in your present working directory. # can make it explicit with -G, -basic-regexp or # default but with some grep implementations, you ![]() Grep -i 'abc\|uyx' # with the \| extension to basic regexps supported by Grep -i -K 'abc|uyx' # ksh regexps (with ast-open grep) also with Grep -i -X 'abc|uyx' # augmented regexps (with ast-open grep) also with With some grep implementations, you can also do: grep -i -P 'abc|uyx' # perl-like regexps, sometimes also with Many options with grep alone, starting with the standard ones: grep -i -e abc -e uyx ![]()
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