Searching

• grep is a command line tool for searching plain text data sets in specific files.

The text search pattern is called a regular expression(REGEX).
When it finds a match, it prints the line with the result. The grep command is handy when searching through large log files.

• Shell commands

  • Searching for pattern in files :

    > grep pattern files

    • Example :

      > grep root /etc/passwd

  • Searching recursively for pattern in dir :

    > grep -r pattern dir

  • Search for pattern in the output command :

    > command | grep pattern

  • Find all instances of a file :

    > locate file

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