Linux Command Reference: tac

tac displays the contents of a file in reverse, or the concatenated contents of multiple files in reverse.

Contents 1 Using tac 1.1 tac Options 2 Quickly View the Contents of a File 3 Help and Manual 4 Related Commands

Using tac

Usage: tac <options> <filename> <additional_file>

tac Options

• -b - Attach the separator before instead of after.
• -r - Intepret the separator as a regular expression
• -s - use STRING as the separator instead of newline.

Quickly View the Contents of a File

Enter tac <filename> where <filename> is the file which you would like to view in reverse.

Note: If the file which you are viewing is particularly long, you may press Ctrl + C at any time to halt the execution of tac.

Help and Manual

Enter tac --help to see basic command line options and syntax or enter man tac to read the manual.

Related Commands

• more
• less
• head
• tail
• cat