Linux Basics-13, command replacement $ ()

[[email protected] ~]# echo It is the time $ (clock)

It is the time November 10, 2016 Thursday 18:20 38 sec -0.327027 seconds

Command substitution

[[email protected] ~]# touch./file-$ (date +%f-%h-%m-%s). txt

[[email protected] ~]# touch./file-$ (date +%f-%h-%m-%s). txt

[[email protected] ~]# touch./file-$ (date +%f-%h-%m-%s). txt

[[email protected] ~]# touch./file-$ (date +%f-%h-%m-%s). txt

[[email protected] ~]# touch./file-$ (date +%f-%h-%m-%s). txt

[[email protected] ~]# touch./file-$ (date +%f-%h-%m-%s). txt

[[email protected] ~]# touch./file-$ (date +%f-%h-%m-%s). txt

[[email protected] ~]# touch./file-$ (date +%f-%h-%m-%s). txt

[email protected] ~]# LL./

Total Dosage 44

-rw-r--r--. 1 root root 0 November 10 14:34 201711201500

-RW-------. 1 root root 1367 July 00:30 anaconda-ks.cfg

-rw-r--r--. 1 root root 0 November 18:26 file-2016-11-10-18-26-04.txt

-rw-r--r--. 1 root root 0 November 18:26 file-2016-11-10-18-26-05.txt

-rw-r--r--. 1 root root 0 November 18:26 file-2016-11-10-18-26-06.txt

-rw-r--r--. 1 root root 0 November 18:26 file-2016-11-10-18-26-07.txt

-rw-r--r--. 1 root root 0 November 18:26 file-2016-11-10-18-26-08.txt

-rw-r--r--. 1 root root 0 November 18:26 file-2016-11-10-18-26-09.txt

-rw-r--r--. 1 root root 0 November 18:25 file-.txt

-rw-r--r--. 1 root root 27828 July 00:30 Install.log

-rw-r--r--. 1 root root 7572 July 00:28 install.log.syslog

This article is from the "James Zhan Linux Advanced ops" blog, so be sure to keep this source http://jameszhan.blog.51cto.com/10980469/1875542

Linux Basics-13, command replacement $ ()