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• Grep with regex install#

To also print the filename use -H or -with-filename along with grep as shown below: # grep -H "lvm\|test" lvm.confĪLSO READ: Commands to List Users in Linux - 100% Beginner Friendly 6. Just instead of providing the directory location, provide the name of the file: # grep -e "lvm" -e "test" lvm.conf

We can use the same syntax with -e PATTERN to grep for multiple strings in the same file. Similarly you can add -e PATTERN for as many patterns you have to grep recursively.Įxample 2: Grep for multiple strings in single file įor example, I wish to grep for pattern " lvm" and " test" inside all files under /tmp/dir and sub-directories # grep -rw '/tmp/dir/' -e test -e lvm The syntax for the same would be: grep PATH -e PATTERN-1 -e PATTERN-2. With grep we can use -e PATTERN to define multiple patterns at once. Since this tutorial is more about grep recursive, the first question is relative to this tutorial but I will cover both of them.Įxample 1: Grep multiple patterns inside directories and sub-directories grep for multiple strings inside same file.grep for multiple strings inside all directories and sub-directories.Grep for multiple patterns with recursive search

Grep with regex install#

You can use -exclude=GLOB multiple times to exclude multiple filesĪLSO READ: 3 simple & easy steps to install vlc player on CentOS 8 5. Here you can replace GLOB with the regex or the actual filename of the file which you wish to exclude. The syntax to use this would be: grep -r -exclude=GLOB PATTERN PATH exclude=GLOB using which you can exclude certain files when grep is searching for your pattern inside directories and sub-directories. Now all these above methods can be little complicated for beginners so don't worry, we have a supported argument with grep i.e. Let us use this syntax in our example: # find /tmp/ \( -name "*linux*" -o -name "*lvm*" \) -prune -o -type f -print0 | xargs -0 grep -w test The syntax to achieve this would be: find PATH -type f \( -name -o -name \) -prune -o -print0 | xargs -0 grep OR # find /tmp/ ! -name "*linux*" ! -name "*lvm*" -type f | xargs grep -w testįind xargs with NOT operator to exclude files-2Īgain similar to find with exec, we can use find with xargs combined with prune to exclude certain files. Now we will adapt this syntax into our example to grep recursively with find command: # find /tmp/ ! -name "*linux*" ! -name "*lvm*" -type f -print0 | xargs -0 grep -w testįind xargs with NOT operator to exclude files-1 The general syntax here would be: find PATH -type f ! -name ! -name | xargs grep Īlternate Method: find PATH -type f ! -name ! -name -print0 xargs -0 grep Now similar to find with exec, we can also use the same NOT( !) operator with xargs. So below example would cover our scenario.ĪLSO READ: 25+ yum command examples in Linux Method 3: using find with xargs (NOT operator) Syntax to use with single filename: find PATH -type f -name -exec grep + In this example we will use find with exec to search for specific files and grep for our string. Now we can have a file such as nf, nf, nfig so all such files would be eligible when we use " lvm" and " linux" as our regex for filename: In the below examples we will " Search for test string in file that contains " lvm" and " linux" in the filename". For example, I wish to grep for " test" string but only in files which contain " lvm" or " linux" in the filename. We can also define filename in plain text format or regex which should be searched to grep the provided pattern. Grep for a string only in pre-defined files With grep utility we have two arguments which can help you perform grep recursively, from the man page of grepĪnd grep for your string # grep -rw test. How do I grep for a pattern inside all directories and sub-directories of my Linux server? Is it possible to perform grep recursively? Can you show me some examples to grep for a pattern or a string recursively across multiple directories?