Which command is used to search for text within files in Linux?

The command used to search for text within files in Linux is indeed 'grep'. This utility searches through the contents of files for specified patterns and outputs lines that match those patterns. It is widely used due to its efficiency and flexibility in handling regular expressions, allowing users to perform complex search patterns.

For example, you can use a command like grep "pattern" filename to find occurrences of the specified "pattern" within the given file, returning only the lines where the pattern appears. This makes 'grep' a powerful tool for text processing and analysis in scripting and command-line operations.

In contrast, the other mentioned commands serve different purposes. 'find' is specifically designed for locating files and directories based on criteria like name, type, or modification date, but it does not check the contents of the files themselves. 'locate' is used for quickly finding files by searching an index, but like 'find', it does not search within the file contents. The 'search' command, on the other hand, does not exist as a standard command in Linux for finding text within files.