Marco -51cto-linux Training-Job 3

Exercise 1: Create a new x_m, X_n, Y_m, y_n directory under/tmp

Mkdir-pv/tmp/{x_,y_}{m,n}

Description:-P Creates a parent directory if there is no parent directory.

-V Displays the creation process.

Exercise 2:

1) Display the/etc/directory, beginning with a non-letter, followed by a letter and any other arbitrary length of any character file or directory

ls/etc/[^a-z][a-z]*

Note: ^ denotes inverse and the letter range in square brackets is case insensitive. If the title starts with a capital letter, follow

A file or directory with a letter and any character of any length, the command statement is variable to:

ls/etc/[^[:upper:]][a-z]*

Summary: * matches any character of any length

? Match any single character

[] matches any single character within the specified range

[^] matches any single character outside the range

           [:lower:] lowercase letters [A-Z]
           [:upper:] Capital Letter [a-z]
           [:alnum:] big, lowercase letters and numbers [0-9a-za-z]   with [: Alpha:]?
           [:d igit:] number [0-9]
           [:space:] Blank character
           [:p UNCT:] punctuation

2) Copy all files or directories ending with. D in the/etc directory to the/tmp/magedu.com directory

mkdir/tmp/magedu.com

Cp-r/etc/*.d/tmp/magedu.com/

Description:-R recursion, which includes subdirectories.

Also try some parameters, when the/tmp/magedu.com path does not exist, you need to first build this directory, and then copy.

Exercise 3:

1) Replace the lowercase letter in the/tmp/readme.test file with uppercase letters and write the results to the new file 1.txt

tr [A-z] [a-z] </tmp/readme.test >1.txt (note that there are spaces between the two brackets)

2) Remove the section (1) from the/tmp/readme.test file

TR ["(1)"]</tmp/readme.test or TR "[(1)]" </tmp/readme.test (7.1 test passed)

Exercise 4:  

1) Execute LS to list the directory file and save the output to the file test

ls-l |tee test

2) Execute LS to list the directory file and append the output to test

ls-l |tee-a test

Description : -A appends to the file

-I does not receive interrupt signal, only [Ctrl]d end

Marco -51cto-linux Training-Job 3