The Shell Foundation of Linux Learning article

echo [options] [Output CONTENT]

-E: Escape character that supports backslash control

Example: Echo-e "Hell\bo" → Output as "helo"

Echo-e "\x68\t\x65\t\x6c\n\x6c\t\x6f\t" → output hello (with format)

Echo-e "\e[1;34mthis is a blue\e[0m" → output blue font (this is a blue)

#30m = black, 31m= red, 32m= green, 33m= Yellow

#34m = blue, 35m= magenta, 36m= cyan, 37m= White

Script execution:

First: (Give execute permission)

①chmod 755 hello.sh

②./hello.sh

The second type: (Do not give execution permission)

①bash hello.sh

command aliases and shortcut keys:

alias→ viewing aliases for system effectiveness

Alias alias = ' original command ' #设定命令别名 (temporary effect)

Vim ~/.BASHRC #写入配置文件 (permanent) (source. bashrc→ Reload config file)

Unalias alias #删除别名 (Temporary entry)

ctrl+c→ forcing the current command to terminate

ctrl+l→ Clear Screen

ctrl+a→ cursor moves to the beginning of the command

ctrl+e→ cursor moves to the end of the command line

ctrl+u→ Delete from the cursor position to the beginning of the line

ctrl+z→ the command into the background.

ctrl+r→ Search in the history command

Historical commands:

History [Options]

-C: Empty history command

-W: Write History command in cache to history command to save file ~/.bash_history

History command saves 1000 by default and can be modified in/etc/profile

!n→ repeating nth History command

!! → Repeat the previous history command

! string → Repeat the last command that starts with the string

Output redirection:

Keypad /dev/stdin0 Standard input

Display /dev/stdout1 standard output

Display /dev/stderr2 standard error output

Command > file #以覆盖的方式 to output the correct output of the command to the specified file or device

Command >> file #以追加的方式 to output the correct output of the command to the specified file or device

Error command 2> file #以覆盖的方式, output the error output of the command to the specified file or device

Error command 2>> file #以追加的方式, output the error output of the command to the specified file or device

Command >> file 2>&1 #以追加的方式 to save the correct output and error output to the same file

Command &>> file #以追加的方式 to save the correct output and error output to the same file

Command >> file 1 2>> file 2 #把正确的输出追加到文件1中, append the wrong output to file 2

Enter redirection:

WC [options] [filename]

-C: Statistics of bytes

-W: Count the number of words

-L: Count rows

<<<

Sequential execution of MULTIPLE commands:

Command 1; command 2 #度命令顺序执行

Command 1 && command 2 #当命令1正确执行, command 2 does not execute

Command 1 | | Command 2 #当命令1执行不正确, command 2 does not execute

Example: Command && echo yes | | Echo no #命令正确执行输出yes, error execution output no

Pipe character:

Command 1 | Command 2 #命令1的正确输出作为命令2的操作对象

Wildcard characters:

？ → Match an arbitrary character

*→ Match 0 or any number of any characters

[]→ matches any one of the characters in brackets

[0-9]→ matches a number in a number from 0 to 9

[^0-9]→ matches any one of the numbers in addition to 0-9

This article is from the "we_need_to_try" blog, make sure to keep this source http://liuxiao255.blog.51cto.com/10551403/1831745

The Shell Foundation of Linux Learning article