One Linux command per day-touch

Linux is used in Linux systems to create files or to modify the timestamp of a file

1. Command function:

   Create an empty file, or modify the timestamp of an existing file

2. Syntax parameters:

-A or--time=atime or--time=access or--time=use only change access time

-C or--no-create does not create any files.

-d< Time Date > Use the specified datetime, not the current time.

-M or--time=mtime or--time=modify only change the modified time

-r< reference file or directory > set the date and time of the specified file or directory to the same date and time as the reference file or directory.

-t< Date Time > Use the specified datetime instead of the current time

-help Help Documentation

-version displaying version information

Command format: Touch [option] filename

Common examples:

Example 1: Create a file that does not exist.

Command:

Touch 1.txt

Output: Plus parameter-C does not create the file

[[email protected] test]# Touch 1.txt 2.txt 3.txt [[email protected] test]# ls 1.txt 2.txt 3.txt [[email protected] Test ]# touch-c 4.txt [[email protected] test]# ls 1.txt 2.txt 3.txt [[email protected] test]#

Example Two: Modify the last modified time of the existing file to current.

Command:

Touch Install.log

Output:

[email protected] ~]# ll install.log-rw-r--r--. 1 root root 34961 June 22:02 Install.log[[email protected] ~]# touch Install.log[[email protected] ~]# ll INSTALL.LOG-RW -r--r--. 1 root root 34961 June 15:17 Install.log[[email protected] ~]#

Example Three: Modify the timestamp of the install.log.syslog to the timestamp of the Install.log.

Command:

Touch-r Install.log Install.log.syslog

Output:

[email protected] ~]# ll Install.log install.log.syslog-rw-r--r--. 1 root root 34961 June 15:17 Install.log-rw-r--r--. 1 root root 7346 June 21:59 Install.log.syslog[[email protected] ~]# touch-r install.log install.log.syslog [[Email PR Otected] ~]# ll Install.log install.log.syslog-rw-r--r--. 1 root root 34961 June 15:17 Install.log-rw-r--r--. 1 root root 7346 June 15:17 Install.log.syslog[[email protected] ~]#

Example four: Setting the timestamp of the file, setting the Install.log.syslog file timestamp to bit 03211111

Command:

Touch-t 03211111 Install.log.syslog

Output:

[email protected] ~]# ll install.log.syslog-rw-r--r--. 1 root root 7346 June 15:17 Install.log.syslog[[email protected] ~]# touch-t 03211111 install.log.syslog [email Protec Ted] ~]# ll Install.log.syslog-rw-r--r--. 1 root root 7346 Mar 11:11 install.log.syslog[[email protected] ~]#

One Linux command per day-touch