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URL:
https://askubuntu.com/q/831418
Title:
What is the difference between touch file and > file?
ID:
/2016/09/30/What-is-the-difference-between-touch-file-and-_-file_
Created:
September 30, 2016
Edited: January 12, 2022
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December 22, 2024
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Both touch and > will create a new file if it doesn’t exist. As the following terminal commands show when you touch an existing file the access/last modified time are updated. But if you > to an existing file it is truncated and the last modified time is updated (access time is not). Note that > does not delete/unlink the file. The inode stays the same – which is why > / or truncate are commonly used to clear out log files even with an open file handle.
rick@dell:~$ > EmptyFile
rick@dell:~$ touch EmptyFile2
rick@dell:~$ ls Empty*
EmptyFile EmptyFile2
rick@dell:~$ ls -l Empty*
-rw-rw-r-- 1 rick rick 0 Sep 29 20:27 EmptyFile
-rw-rw-r-- 1 rick rick 0 Sep 29 20:27 EmptyFile2
rick@dell:~$ echo Hello > EmptyFile
rick@dell:~$ ls -l Empty*
-rw-rw-r-- 1 rick rick 6 Sep 29 20:28 EmptyFile
-rw-rw-r-- 1 rick rick 0 Sep 29 20:27 EmptyFile2
rick@dell:~$ > EmptyFile
rick@dell:~$ ls -l Empty*
-rw-rw-r-- 1 rick rick 0 Sep 29 20:28 EmptyFile
-rw-rw-r-- 1 rick rick 0 Sep 29 20:27 EmptyFile2
rick@dell:~$ echo Hello > EmptyFile
rick@dell:~$ touch EmptyFile
rick@dell:~$ ls -l Empty*
-rw-rw-r-- 1 rick rick 6 Sep 29 20:32 EmptyFile
-rw-rw-r-- 1 rick rick 0 Sep 29 20:27 EmptyFile2
As mentioned in comments, touch is an external command and only operates on files. > is a shell built-in feature that serves many different purposes. Sometimes you would see it used like cat Source.txt > Target.txt.
A long form to empty a file would be:
cat /dev/null > EmptyMe.txt
Using > EmptyMe.txt accomplishes the same thing in a compact format of redirecting nothing to the file.