'tac' - concatenate and print in reverse - Video Man Pages
December 4, 20254m 25s
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Show Notes
- Print the contents of a file in reverse (by line) to stdout:
tac path/to/file
- Concatenate specific files in reverse:
tac file1 path/to/file2 ...
- Display stdin in reversed order:
printf "one\ntwo\nthree\n" | tac
- Use a specific separator rather than the new line:
tac -s separator path/to/file1 path/to/file2 ...
- Use a specific regex as a separator:
tac -r -s 'regex' path/to/file1 path/to/file2 ...
EXAMPLE: tac -r -s 'x\|[^x]' file1
This matches either the character 'x' OR any character that is not 'x', effectively matching every character in the file.
- Use a separator (new line by default) before each file:
tac -b file1 file2 ...
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