Kas saaksite selgitada grep käsu tööpõhimõtet ja peamisi funktsioone Linuxis?

The grep command in Linux is used to search for lines in files or the output of other commands that match a given pattern (usually a regular expression). Main functions:

• Search for text by pattern in files
• Filter the output of other commands
• Support for regular expressions
• Options to ignore case, display line numbers, count matches

Example of usage:

grep -i "error" /var/log/syslog

This example searches for all lines containing "error" regardless of case in the system log.