tldr/pages/common/keep-header.md

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2022-08-30 20:51:26 +01:00
# keep-header
> Keep first line untouched by a command, passing it directly to stdout.
> More information: <https://github.com/eBay/tsv-utils#keep-header>.
- Sort a file and keep the first line at the top:
`keep-header {{path/to/file}} -- sort`
- Output first line directly to stdout, passing the remainder of the file through the specified command:
`keep-header {{path/to/file}} -- {{command}}`
- Read from stdin, sorting all except the first line:
`cat {{path/to/file}} | keep-header -- {{command}}`
- Grep a file, keeping the first line regardless of the search pattern:
`keep-header {{path/to/file}} -- grep {{pattern}}`