The touch command can be used to modify the file access/modification timestamp. Use the touch command to create a blank file. The required syntax is "linuxidc@linuxidc:~$ touch linuxidc.txt". Use the touch command to create multiple files "linuxidc@linuxidc:~$ touch linuxidc.txt".
The touch command can be used to modify the access/modification timestamp of a file. More often it will be used to quickly create an empty file.
The touch command can be used to modify the access/modification timestamp of a file. More often it will be used to quickly create an empty file.
A nice feature of touch is that it does not automatically override (ie, erase) compared to commands such as cp (for copying files and directories) and mv (for moving or renaming files and directories). The content of an existing file with the same name. Instead, it simply changes the last access time of these files to the current time.
In this article, we'll explain some simple and quick examples of using the touch command to modify timestamps or create files.
1. How to create a blank fileTo create a simple blank file with the touch command, use the following syntax. If the file name you selected already exists, just change the access time
If you want to create multiple files with the touch command, just enter the filename of the extension with spaces. You can check the syntax below.
If you want to create a batch file, for example 20 or 30 files instead of an extension. The following example will definitely help you. You can use the command ls or ll to check if the file was created. Since I am using a graphical interface, it is more intuitive to open the folder directly.
As shown below:
Open the folder and see:
Do you just want to update the access time of existing files? Yes, of course you can do this without having to create a new file. Use the option "-c". If the file exists, touch will update the access time, otherwise nothing will be done.
The output is as follows.
File: linuxidc.txt
Size: 0 Block: 0 IO Block: 4096 Normal empty file
Equipment: 804h/2052d Inode: 1451165 Hard link: 1
Permissions: (0644/-rw-r--r--) Uid:( 1000/linuxidc) Gid:( 1000/linuxidc)
Recently visited: 2018-02-06 20:17:54.730291896 +0800
Recently changed: 2018-02-06 20:17:26.434083956 +0800
Recent changes: 2018-02-06 20:17:54.730291896 +0800
Creation time:-
As shown below:
Use the '-m' option to change the modification time of the file. You can check the time changes below with the stat command.
The output is as follows.
File: linuxidc.txt
Size: 0 Block: 0 IO Block: 4096 Normal empty file
Equipment: 804h/2052d Inode: 1451165 Hard link: 1
Permissions: (0644/-rw-r--r--) Uid:( 1000/linuxidc) Gid:( 1000/linuxidc)
Recently visited: 2018-02-06 20:17:54.730291896 +0800
Recently changed: 2018-02-06 20:19:51.999315295 +0800
Recent changes: 2018-02-06 20:19:51.999315295 +0800
Creation time:-
As shown below:
Use wildcards to change the modification time of multiple files.
We use the "a" and "m" options together to modify the access and modification time. You can also check the timestamp of the change using the "stat" command.
The output is as follows.
File: linuxidc.txt
Size: 0 Block: 0 IO Block: 4096 Normal empty file
Equipment: 804h/2052d Inode: 1451165 Hard link: 1
Permissions: (0644/-rw-r--r--) Uid:( 1000/linuxidc) Gid:( 1000/linuxidc)
Recently visited: 2018-02-06 20:24:56.038676993 +0800
Recently changed: 2018-02-06 20:24:56.038676993 +0800
Recent changes: 2018-02-06 20:24:56.038676993 +0800
Creation time:-
To set the access/modification time to a specific datetime, use the t option and specify the datetime in this format ((CC)YY)MMDDhhmm.(ss)
List of options for the touch command
-a - change the access time of the file
-c - Do not create the specified file if it does not exist.
-m - Change the modification time of the file.
-r --ref_file uses the corresponding time of the file named by ref_file instead of the current time.
-t - time uses the specified time instead of the current time. Time will be the decimal number of the table
MM - the month of the year [01-12]
DD - one day a month [01-31]
Hh - the hour of the day [00-23]
Mm - the hour of the hour [00-59]
CC - the first two digits of the year
YY - the last two digits of the year
SS - second minute [00-61]
Note: If the c option is omitted, if it does not exist, a new file will be created with the given date and time.
10. How to use the timestamp of another file as a referenceThe following command sets the access/modification time of linuxmi.txt to the access/modification time of linuxidc.txt.
In addition to the option "t", there is another option "-d" that accepts datetimes in a generally human readable format.
The following examples only provide dates. The time will be automatically set to 00:00
In this article, we introduced the basic touch commands that should be used more frequently. You can search for more command options from its man page.
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