![]() The command: ls -1 *.c | xargs grep -v "C. Supplying the -v argument to grep gives us the inverse result, i.e., The file someotherfile.c consists of Content to findĪnd our command ls -1 *.c | xargs grep "C.*t" The file somefile.c consists of: Ignore this! To follow your description of the intent, I will expect my command line to find the files somefile.c and someotherfile.c, and search within these for a pattern that starts with a capital C and ends with a lowercase t. In a directory with the following contents:Įrlang hello.cs hello.exe somefile.c someotherfile.c The resulting command looks like this: ls -1 *.c | xargs grep "C.*t" I would then construct the command line for grep with xargs (the utility built for that purpose) from the output of ls and the pattern that you want grep to look for (thus using grep in the most natural way). My preference would be to leave the task of finding and listing the files of interest to ls the utility that is built for that purpose, having it list them one filename per line. c files in the current directory for your search (as implied by your first command line). ![]() The discussion that follows presumes that your intent is simply recursing over the. c files", the first in the current directory, the second by recursive descent of the current directory and all subdirectories, if you eliminate the "-l" flag from both of them. Your two command lines will both "recursively search a pattern in all the. Is recursively searching for "search-pattern" in all files in the current directory and all subdirectories (because * is being interpreted as a wild card for "folder name"). Your second command line (again ignoring the -l flag): > grep -lr search-pattern * Nick McCurdy at 20:56 26 Actually neither -r nor -recursive work on the Solaris box I use at work. It will find nothing if there are no such files in the current directory. If you find yourself frequently using grep to do recursive searches (especially if you manually do a lot of file/directory exlusions), you may find ack (a very programmer-friendly grep alternative) useful. Is recursively searching, within the files in the current directory whose filenames end in. Therefore, your original command line (ignoring the -l flag): If you found this post interesting, I’ve also written up some examples of how to grep using Windows Powershell here.As the grep documentation states in its discussion of the -r option: "If no folder name is given, grep command will search the string inside the current working directory." 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: Use the below command inside the directory you would like to perform the grep and change SEARCHPATTERN to match what you would like to match. 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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