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Man: Add a manpage for rev(1)
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Base/usr/share/man/man1/rev.md
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Base/usr/share/man/man1/rev.md
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## Name
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rev - reverse lines
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## Synopsis
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```*sh
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$ rev [files...]
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```
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## Description
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`rev` reads the specified files line by line, and prints them to standard
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output with each line being reversed characterwise. If no files are specifed,
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then `rev` will read from standard input.
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## Examples
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To print two files 'foo' and 'bar' in reverse:
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```sh
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$ cat foo bar
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foo 1
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foo 2
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bar 1
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bar 2
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$ rev foo bar
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1 oof
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2 oof
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1 rab
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2 rab
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```
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To list files with their names in reverse:
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```sh
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$ ls
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foo
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bar
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$ ls | rev
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oof
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rab
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```
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