Linux topic-1

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