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touch

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    This subchapter looks at touch, a Unix (and Linux) command.

    Use touch to change the date stamp on a file.

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touch

    This subchapter looks at touch, a Unix (and Linux) command.

    Use touch to change the date stamp on a file.

    The most common use of touch is to force make to recompile a particular file (or group of files).

how to use

    The simple form of touch changes a named file’s timestamp to the current date and time:

$ touch filename

multiple files

    Use touch to change all of the files in a directory:

$ touch *

specific time

    You can use touch to set a specific time by using the -t option. The following command sets a file to the Solstice at the end of the Mayan calendar (11:12 a.m. December 21, 2012):

$ touch -t201212211112.00 filename

    The following command sets a file to the noon on January 1, 2012:

$ touch -t201201011200.00 filename

    The format is YYYYMMDDhhmm.ss, YYYY = four digit year, MM - two digit month, DD = two digit day, hh = two digit hour (24 hour clock), mm = two digit month, and ss = two digit second.

create an empty file

    You can use touch to create an empty file. Simply issue the touch command with the desired file name.

$ touch filename

    This will create an empty file with the designated file name.

    Why would you want to do this? One common reason is to create an expected file. Some scripts will check for the existence of particular files and choke if they can’t find them. If the script does not need particular data alreazdy stored in the file (for example, it will be appending data intot he file or it is simply checking for the existence of the file), then touch is your fast and easy method for creating the expected file (as an empty file).


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free music player coding example

    Coding example: I am making heavily documented and explained open source code for a method to play music for free — almost any song, no subscription fees, no download costs, no advertisements, all completely legal. This is done by building a front-end to YouTube (which checks the copyright permissions for you).

    View music player in action: www.musicinpublic.com/.

    Create your own copy from the original source code/ (presented for learning programming).

This section is under the category of owning cirticism.

In response to a posting about my article collecting social media, Moderator +Andrew Smith (Technology addict, Web Developer, API guru, futsal and football wannabe, and all round nice guy!, Swordfox Design, arrowtown, new zealand) of the Google+ community Web Developers, Web Designers, Web Coding claims “Quite frankly this is self promotion, and your site is not of great quality. I can see how +Joost Schuur  would think this of not high enough a standard.”


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free book on Unix/Linux System Administration

Teach Yourself Unix/Linux System Administration and Shell Programming

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    Copyright © 2012, 2014 Milo

    Created: July 9, 2012

    Last Updated: July 18, 2014


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