One day a shell command Linux text Manipulation Series-touch command usage _linux shell

We've studied DD before. Create a test file, if you do not need to consider the size of the file, create a blank file, you might want to try

Touch:

Change the access time and modification time of each file to the current time.
Files that do not exist will be created as empty files unless the-C or-h option is used.

Examples of getting Started:

1. If you want to generate 100 empty files

For name in {1..100}.txt does touch 
$name 

2. Improve

Touch test{1..20}.c

View--help

Usage: Touch [options] ... File...
Change the access time and modification time of each file to the current time.
Files that do not exist will be created as empty files unless the-C or-h option is used.

If the file name is "-" special processing, change the access time of the file associated with the standard output.

Parameters that must be used for long options are also required for short options.
-A Change access time only
-C,--no-create does not create any files
-D, the--date= string uses the specified string to represent the time rather than the current time
-F (ignored)
-H,--no-dereference affects the symbolic link itself, not the destination indicated by the symbolic link
(This option is useful when the system supports changing the owner of the symbolic link.)
-M change modification time only
-R, the--reference= file uses the time attribute of the specified file instead of the current time
-T STAMP use [[CC]YY]MMDDHHMM[.SS] format time instead of the current time
--time=word time specified with WORD: Access, atime, use are equal to-a
Effects of options, while modify, Mtime equals-M options
--HELP displays this help information and exits
--version display version information and exit

Note that the-D and-t options can accept different time/date formats.

Interpretation:

1. D uses the specified string to represent the non current time

$touch-D "Fri June 20:50:14 IST 1999" FileName

This is a simple command, a lazy day ...

More detailed methods can refer to this article: http://www.jb51.net/LINUXjishu/257946.html