The locate command is fast, but it doesn't have as many options as the find command. If you search for an executable that is only available for the root user as a normal user, no results will display. I conjectured that it was because of symlinks and sure enough that was the case. Beware that versions of bash prior to 4. I am trying to find the largest file in a directory recursively. Let us see how to find largest file in Linux server using various commands.
For example, typing whereis firefox at the prompt displays results as shown in the following image. The locate command generally works much faster than find, because it works off a database of your file structure. Use -execdir to execute the specified command in the directory where the match resides. And globstar that allows to recurse through all the directories shopt -s extglob nullglob globstar Now all you need to do is form the glob expression to include the files of a certain extension which you can do as below. Search String in Specific Files You can search string in files matching the file name criteria.
That is evil: rm -r is not for deleting files but for deleting directories. This happens automatically daily, but you can manually update it too. To do this, type the following command at the prompt: sudo updatedb Enter your password when prompted. You can change that using the -a option, discussed earlier, for the which command. How to partition and format a new drive in Linux System? The grep command will return an error when it tries to access folders without the correct permissions or runs into empty folders.
As Nicklas , you may also use the ncdu disk usage analyser. This tutorial will help you to search all files matching a string recursively. This way, if you had, say, foo. We use an array to populate the glob results because when quoted properly and expanded, the filenames with special characters would remain intact and not get broken due to word-splitting by the shell. This will tell find to search all directories starting from the root directory.
For more information about the whereis command, type man whereis in a Terminal window and press Enter. As you can see, this is a much shorter command, and it performs the same recursive search as the longer command. You can use the -and, -or, and -not operators to combine different types of searches into one. You'll need to do this if you want to start using locate immediately. It is the case insensitive version of the -name command. We can do the following: bash-4. Only the paths to executables found are displayed.
What you need to do is either use find: find. Three user-selectable optimization levels are specified as -O1, -O2, and -O3. Quoting prevents glob expansion and passes the command line to find as-is. It is preferred for demo applications. If you want the first in alphabetical order, add an extra on order by name to sort ties alphabetically. This is what's written in a script file:! To find a big file concerning file size on disk is easy task if you know how to use the find, du and other command.
For more information on the find command, see my , and for more information on the grep command, see my. It is preferred for demo applications. You can also omit the filename query to return all of the files that match that type. How do I find largest file in a directory recursively using the find command? That's what I do when I leave comments where there are broken scripts: it's usually about quotes and filenames containing spaces, newlines, globs, etc. Here, the + sign at the end enables multiple directories to be read simultaneously. Though using find command can be useful here, the shell itself provides options to achieve this requirement without any third party tools. For more information about either the locate or the mlocate command, type man locate or man mlocate in a Terminal window and press Enter.
With the same syntax, one could use the results of the glob to exclude files of certain type. I found the largest files on my disk. Use find to search for a file or directory on your file system. I need to find a biggest or largest file concerning file size on the disk. The extended option is extglob which needs to be set using the shopt option as below. Using the Whereis Command The whereis command is used to find out where the binary, source, and man page files for a command are located.
The locate command generally works much faster than find, because it works off a database of your file structure. That also assumes that file names don't end in newline characters and will skip hidden files and not descend into hidden directories. Before the implementation of the -exec option, this kind of command might have used the xargs command to generate a similar output: find. This article was co-authored by our trained team of editors and researchers who validated it for accuracy and comprehensiveness. Read Also: This short tutorial describes how to find and delete directories recursively in the Linux file system. For more info see this page or man pages of du and find commands: man du man find man sort man head man tail. What you want is possible with zsh but not with sh or bash new versions of bash cannot do this by default but if the shell option globstar is enabled: shopt -s globstar.
If you are trying to find a specific file owned by a user, or files with certain permissions, you can narrow the search. For example consider a case of needing to get all recursive image files i. If you want find to follow and return symbolic links, you can add the -L option to the command, as shown in the example above. Level -O3 optimization allows find to perform the most severe optimization and reorders all tests based on their relative expense and the likelihood of their success. Note that it considers the files size, not disk usage. It will then use the chmod command to change the permissions to 755. The bash shell provides an extended glob support option using which you can get the file names under recursive paths that match with the extensions you want.