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tac: add stdin example (#3844)

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Raghu Kalluri
2020-02-08 15:48:47 +01:00
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pages/common/tac.md
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# tac
> Print and concatenate files in reverse.
> Print and concatenate files in reverse (last line first).
- Print the contents of *file1* reversed to the standard output:
`tac {{file1}}`
- Print the contents of the standard input reversed to the standard output:
`{{command}} | tac`
- Concatenate several files reversed into the target file:
`tac {{file1}} {{file2}} > {{target_file}}`