1, role: list the contents of the directory;
2, format: ls [options] [files]
[options] is specified to view the file-related content, if not The specified file defaults to view all files in the current directory;
3, common parameters:
As shown in the figure:
4, use examples:
[yourname @www /]$ ls –l (can be abbreviated as ll)
total 220
drwxr-xr-x 2 root root 4096 Mar 31 2005 bin
drwxr- Xr-x 3 root root 4096 Apr 3 2005 boot
-rw-r--r-- 1 root root 0 Apr 24 2002 test.run
…
This example looks at all the files in the current directory and displays the details via the option “-l”.
The display format is as follows: File Type and Permission (Hard) Number of Links File Owner File Group File Size Modified Time Name.
If you want to display all the files at the beginning of “.”, you can use -a, which is very common in embedded development.
Note:
Executables in Linux are not identified by file extensions like Windows, but by setting the executable properties of the file.
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Use yum to install the scheduled task function. The result is prompted:
Copy the code
The code is as follows:
# yum -y install vixie-cron
Loaded plugins: fastestmirror, refresh-pa
Grep yum root 6744 0.0 0.0 103260 900 pts/1 S+ 14:59 0:00 grep yum root 25960 0.0 0.0 0 0 ? Z Sep19
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