Learn to update timestamps and create empty files at the Linux command line.
Linux touch command summary with examples (3:57)
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Our sixteenth word, or command to memorize is
touch from the category Files.
touch allows you to update file
Recall from our last video (tutorial) we saw our first command related to time, now we'll be able to edit the timestamps saved to those files.
Before we start, it helps to think of commands as mini programs and
most follow this structure:
command -option(s) argument(s).
touch command has
11 options and the argument is the file you'd
like to edit, and if you think about it, the argument is required
here, as you can't touch nothing, right?
As with many commands, the double-dash
--help option is available. If no
option is specified, the default update is to the current time.
With the double-dash
--date option you can update to a
different date using a human-readable date format, like "next Monday".
So why is
touch an important command?
Well, touch is a helpful command when creating scripts and
surprisingly is a great way to create a new empty file as well.
And now you know how to do that.
Okay, the best way to embed this in your memory is by typing in your own terminal window.
Find this on your Mac using a program called Terminal. On Linux use Terminal or Konsole, and currently Microsoft is adding this functionality to Windows.
Here we go, let's start with that cool feature of the
touch command, creating a file. Let's
make one called video16.txt and then list files using
ls -og to simplify the view so we can
see the timestamps.
Notice, the date is October 10, and how the file size is zero. Interesting, isn't it?
Now, let's try something fun. Let's update, using
touch --date="yesterday" and the file
ls -og again, and voila, the
timestamp now reads October 9.
Okay now you know how to use
And you know the syntax for commands, options and arguments.
One last tip about the
Files actually have three timestamps, the first one is associated with
changes to contents, next permissions, and last the read time. We'll
revisit this topic later.
Okay, thanks for visiting today. I hope this was a fun introduction
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datecommand, hit Back.
filecommand and examine whether a file is an executable or ASCII text file, click Next.