commandfu

If you are using a Linux system that uses yum for package management (like Fedora, Centos, RHEL), you can use the following command to find out which package contains a file. This is useful when you want to figure out which package to install. For example, dig (DNS utility) doesn’t come pre-installed on the system. And running “sudo yum install dig” doesn’t do anything.

sudo yum whatprovides '*/dig'

This returns

Loaded plugins: fastestmirror
 Loading mirror speeds from cached hostfile
 32:bind-utils-9.8.2-0.47.rc1.el6.x86_64 : Utilities for querying DNS name servers
 Repo : base
 Matched from:
 Filename : /usr/bin/dig

breaking down the command options

whatprovides : Is used to find out which package provides some feature or file. Just use a specific name or a file-glob-syntax wildcards to list the packages available or installed that provide that feature or file.

The title pretty much says it all :). Here is a quick one liner, using multiple tools, to look for files in a directory, search for certain content in them and replace them with other content

[code]find -type f | xargs grep -l ORIGINAL_CONTENT | xargs perl -p -i -e ‘s/ORIGINAL_CONTENT/NEW_CONTENT/g’ [/code]

You can theoretically take out the grep (second command) and directly pipe the find output to perl and get the same outcome.

Going over list of the options used

find

“-type f” lists all objects of type file in the directory (and sub directories)

grep

“-l” lists the names of the files (with relative path) which have the text ORIGINAL_CONTENT in them

perl

“-p” forces perl to loop through requests. In this case files
“-e” tells perl that the next argument is a perl statement
“-i” tells perls to edit the file in place (i.e. no need for an output file)

HOW TO : Search which package contains a filename

HOW TO : Find files, search for content in them, replace the content

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