![]() Oops, if you’ll excuse me, there are some kids using superscalar multiprocessor RISC unix machines (iPhones) on my lawn that I need to go yell at. I generally use -r because symlinks are often semantically “This doesn’t quite belong here” for me. 5.1 grep grep, Matches pattern in input text grep -i, Ignore case grep -RI, Search recursively for an exact string grep -E Use extended regular expression. R vs -r: I’m not sure if you actually care about the difference between -R and -r my guess is that you probably don’t: -R derefs symlinks while -r ignores them. M-x rgrep explicitly prompts for a filename pattern to use when running, *and* gives you a nice result buffer that you can click/Enter on to go directly to the result in another emacs frame. Or, if you’re using org files, you’re probably in emacs. Related postsįWIW, GNU grep has a way to do this that doesn’t choke on filenames containing spaces, and also avoids the overhead of starting a new process for each file (this was more of a thing twenty-mumble years ago when I was a baby sysadmin, but it’s still relevant if you have a very large number of matching filenames). org and search them for ‘cheese.'” It’s good to understand how both approaches work. org” whereas the version with find reads like “Find files whose names end in. From left to right, it essentially says “Search for ‘cheese’ in files ending in. Now the code reads more like an ordinary call to grep. I was discussing this with Chris Toomey and he suggested an alternative using a subshell that seems more natural: grep -l cheese $(find. One way to solve this is with find and xargs: It seems that grep -R can either search all files of the form *.org in the current directory, ignoring the -R switch, or search all files recursively if you don’t give it a file glob, but it can’t do both. You have four files, two in the working directory and two below, that all contain the same string: “I like cheese.” org files in your current directory and below that contain the text “cheese.” If you found this post interesting, I’ve also written up some examples of how to grep using Windows Powershell here.The regular expression search utility grep has a recursive switch -R, but it may not work like you’d expect. Using the preceding command, grep will recurse ( -r ) and search all files starting in the current directory and output the results to a file ( >. type f -exec grep -n "text_to_find" \ -print If you have filenames with spaces in them, the commands above will not work properly, another alternative is:įind. type f -print | xargs file | grep -i text | cut -d ':' -f 1 | xargs grep text_to_find If you don’t know what file type to narrow the search by, you make use of the “ file” command to restrict the search to text files only:įind. name '*.c' | xargs grep -n "text_to_find" You can narrow down the selection criteria:įind. The above command is fine if you don’t have many files to search though, but it will search all files types, including binaries, so may be very slow. If you do not have GNU grep on your Unix system, you can still grep recursively, by combining the find command with grep: But older releases of Unix do not have GNU grep and do not have any option to grep recursively. This is all very easy because Linux includes GNU grep. To search within particular file types:.Note line numbers are added with -n option ![]() I always like to use grep -rn because it shows the line number also:.You could easily replace that with “/etc” for example: The dot simply means start the search from the current working directory.“text_to_find” is the string to search for.If you’re using Linux, performing a recursive grep is very easy.
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