#Grep for multiple strings how to#
Examples of how to search for a single string or pattern One of the most common options used with grep is "-i", which makes the search case-insensitive. If no file name is given, grep will read from standard input (e.g., output from another command). The "pattern" is the string or regular expression you want to search for, and the "file" argument specifies the name of the file you want to search in. The basic syntax of a simple grep command is as follows − grep pattern Grep is a powerful command-line tool used in Unix-based operating systems to search for specific patterns or strings of text in files or output from other commands. Grep is a versatile tool that can be used for many different tasks, including system administration, programming and data analysis. It can search through an entire directory structure, filter the results and display only relevant data to the user. It stands for “Global Regular Expression Print” and is used for searching text files or output of commands for specific patterns or strings. If more than one match was found, then each line number will be appended to the filename.Grep is one of the most powerful and widely used command-line tools in Linux/Unix systems. Demos/snippets/multiComptSigNeur.py:268Īnd voila, it generates the path of matched files and line number at which the match was found. python/moose/multiscale/core/mumbl.py:206 Only those files which matches this regular expression will be considered.įor example, if I want to search Python files with the extension py containing Pool( followed by word Adaptor, I do the following. This is another regular expression which works on a filename. The third argument, file_pattern, is optional. We use the regular expression format defined in the Python re library. The second argument, pattern_to_search, is a regular expression which we want to search in a file. The first argument, path, is the directory in which we will search recursively. This is how one should use this script./sniff.py path pattern_to_search I wrote a Python script which does something similar. -print0 and -null on the other side of the | (pipe) are the crucial ones, passing the filename from the find to the grep embedded in the xargs, allowing for the passing of filenames WITH spaces in the filenames, allowing grep to treat the path and filename as one string, and not break it up on each space.-type f specifies that you are looking for files.( -name " *.pas" -o -name " *.dfm" ) : Only the *.pas OR *.dfm files, OR specified with -o in the find specifies from the current directory. type f \( -name "*.pas" -o -name "*.dfm" \) -print0 | xargs -null grep -with-filename -line-number -no-messages -color -ignore-case "searchtext"
type f -name "*.*" -print0 | xargs -null grep -with-filename -line-number -no-messages -color -ignore-case "searthtext"Īnd if you have an idea what the file type is you can narrow your search down by specifying file type extensions to search for, in this case. "/home" depending where you actually want to search.Įxpanding the grep a bit to give more information in the output, for example, to get the line number in the file where the text is can be done as follows: find. So in the examples above, you'd better replace ' /' by a sub-directory name, e.g. Warning: unless you really can't avoid it, don't search from '/' (the root directory) to avoid a long and inefficient search! Note: You can add 2>/dev/null to these commands as well, to hide many error messages. The Silver Searcher: ag 'text-to-find-here' / -l
RipGrep - fastest search tool around: rg 'text-to-find-here' / -l Better try them, provided they're available on your platform, of course: Faster and easier alternatives The find command is often combined with xargs, by the way.įaster and easier tools exist for the same purpose - see below. \ 2>/dev/nullįind is the standard tool for searching files - combined with grep when looking for specific text - on Unix-like platforms.
This will only search through those files which have.
Do the following: grep -rnw '/path/to/somewhere/' -e 'pattern'
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