tldr/pages/common/keep-header.md

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}}