1, Gpl,gnu, free software?
2, how to choose the Linux operating system version?
3. How to partition Linux system?
4, Linux 20 commands and role?
5. Linux Run level?
6, 32-bit and 64-bit system differences and how to choose?
7. What is the PATH environment variable and what does it do?
filter out all the first-level directories in the XWJ under the known current directory (subdirectories and hidden directories that do not contain directories below the XWJ directory, only a single level directory )
1, according to color distinguish files and directories (CENTOS6 directory default color is blue)
Glasses distinguishing
2, the ls-l output of the results in D is the directory
[Email protected] ~]# ls-l/xwj |grep "^d"
3, by the directory to add the identification, and then filter out the logo, is to filter out the directory
[Email protected] ~]# Ls-f/XWJ | grep "/$" or [[email protected] ~]# ls-p/xwj | grep "/$"
4. Find files of the specified type directly with find (-D is the directory)
Common Regular Expressions:
^ with ... Beginning ^d begins with D
% to ... End \$ with \ End
The \ Escape character lets the original meaningful character take off the vest and restore the meaning of its own character
. Represents any single character
Linux topic-1