keep first line untouched by a command

Keep first line untouched by a command, passing it directly to stdout.

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

More information: https://github.com/eBay/tsv-utils#keep-header .

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