rev
Text processing
Usage
rev [file]Reverses the characters within each line, not the order of the lines — that is tac's job.
Common flags
| Flag | Meaning |
|---|---|
| none | rev has no options; pipe it through cut or paste instead |
Examples
echo hello | revPrints olleh.
rev paths.txt | cut -d/ -f1 | revGrabs the last slash-separated field.
These were built to be piped together. Three joined commands are usually shorter than one that does everything.
How to read this
- Square brackets [ ] mark a part you may leave out.
- An ellipsis … means you can list more than one.
- Flags are case-sensitive — in some commands -r and -R do different things.
Questions
Q. What does rev do?
Reverses the characters within each line, not the order of the lines — that is tac's job.
Q. How do I type it?
rev [file] — square brackets mark the parts you can leave out.
Q. How many flags are worth knowing?
1 are listed here; the full set is in man rev. This command sits under Text processing.
Related commands
man page: man rev