locate

Explanation

The locate command reads one or more databases prepared by updatedb and writes file names matching at least one of the patterns to standard output. Because it queries a pre-built database rather than searching the live filesystem like find, it is incredibly fast. However, it will not find files created after the last database update.

Basic Syntax

locate [OPTION]... PATTERN...

Common Flags and Options

Flag	Description
-i, --ignore-case	Ignore case distinctions when matching patterns.
-c, --count	Instead of printing matched filenames, just print the number of matches.
-l, --limit, -n LIMIT	Limit output (or counting) to LIMIT matches.
-e, --existing	Print only entries that refer to files existing at the time locate is run.

Real-world Examples

1. Find a file by part of its name:

   locate sshd_config

2. Find a file case-insensitively:

   locate -i readme.txt

3. Count the number of MP3 files on the system:

   locate -c "*.mp3"