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

  • 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}}