![]() ![]() This will search for the string 'windows' in all files relative to the current directory and replace 'windows' with 'linux' for each occurrence of the string in each file.Īny comments / suggestions for improvement are much welcomed. 1 To search multile strings in a file you can use egrep or grep on linux. Not that great of an example (you could just search files for that phone number instead of the string 'phonenumber'), but your imagination is probably better than mine.Ä®xample grep -rl 'windows'. For example, maybe you have a lot of files and only want to only replace on files that have the matchstring of 'phonenumber' in them, and then replace '555-5555' with '555-1337'. This is useful if you are searching through multiple files for the same. There may be times when you want to use grep to find only files that have some matchstring and then replace on a different string in the file than matchstring. Beginning at the first line in the file, grep copies a line into a. String2 is the string that replace string1. String1 would ideally be the same string as matchstring, as the matchstring in the grep command will pipe only files with matchstring in them to sed. Matchstring is the string you want to match, e.g., "football" The pipe delimiter might be useful when searching through a lot of html files if you didn't want to escape the forward slash, for instance. ![]() 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.Note: The forward slash '/' delimiter in the sed argument could also be a different delimiter (such as the pipe '|' character). 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 The grep command can be used to find multiple strings in a single file or. ![]() 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. With the grep command, you can search for any information in any file or directory. The courses arenât on the same line so itâs not so straight forward but thereâs a very simple way to find those pesky files. I want to grep for files containing the words Dansk, Svenska or Norsk on any line, with a usable returncode (as I really only like to have the info that the strings are contained, my one-liner goes a little further then this). It does not use regular expressions instead, it uses fixed string comparisons to find matching lines of. The problem I now had was that I wanted to know exactly how many had booked BOTH courses. fgrep searches files for one or more pattern arguments. OR use grep '' , which will tell grep to search the for . r, which tells grep to search the current directory recursively for in every file. I could then find out which ones were booking Course 2: grep -l "COURSE: Course 2" * 1 Answer Sorted by: 0 use grep ''.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. Walter Tross at 11:54 14 anyway, you were almost there Just replace -H with -l (and maybe grep with fgrep ). My advice is to alway use either fgrep or egrep. as a single-character wildcard, among others. 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. 41 remember that grep will interpret any. Grep is most definitely not the most exciting tool to talk about. ![]()
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