https://github.com/kdm9/hail

Hail: extract lines from a file, a la `head -n x | tail -n y`
https://github.com/kdm9/hail

Last synced: 19 days ago
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Hail: extract lines from a file, a la `head -n x | tail -n y`

• Host: GitHub
• URL: https://github.com/kdm9/hail
• Owner: kdm9
• Created: 2015-02-13T12:34:55.000Z (almost 10 years ago)
• Default Branch: master
• Last Pushed: 2020-09-03T09:18:50.000Z (about 4 years ago)
• Last Synced: 2024-10-11T19:23:32.074Z (about 1 month ago)
• Language: C
• Size: 12.7 KB
• Stars: 8
• Watchers: 2
• Forks: 1
• Open Issues: 0
• Metadata Files:
  • Readme: README.md

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README

        
hail

====

Extract lines from a file

Installation

------------

Hail has no dependencies other than a C compiler which implements the GNU-C99

standard. To install:

    git clone https://github.com/kdmurray91/hail.git

    cd hail

    make

    make install

About

-----

Hail gets its name from a contraction of `head` and `tail`, the common

alternative to this program. It extracts lines from a file, taken on stdin,

and prints them on stdout. It's so simple that the Unix wizards of old never

bothered. But I'm lazy and prone to procrastination.

Hail takes any number of `x`-`y` pairings as arguments. These pairs are

integral numbers, corresponding to the first and last lines to print. The

final number may be excluded to indicate that the remainder of the file

should be printed

Examples

--------

    # prints 1 through 10, i.e. does nothing

    seq 1 10 | hail 1-

    # prints 1 through 3, i.e. equivalent to `head -n 3`

    seq 1 10 | hail 1-3

    # prints 3 through 5, i.e. equivalent to `head -n 5 | tail -n 3`

    seq 1 10 | hail 3-5

    # prints 5 through 10, i.e. equivalent to `tail -n 6`

    seq 1 10 | hail 5-

    # prints 2, 3, 5 and 7, which is where I'll give up on my comparisons to

    # head and tail

    seq 1 10 | hail 2-3 5-5 7-7

License

-------

Copyright 2015 Kevin Murray 

Licensed under the GNU General Public License, version 3 or (at your option)

any later version.