Special symbols in shell

shell Special symbols in

  
~    :   Add a catalog  # cd ~  Represents the user's home directory 

!     :   Execute historical orders  !！ Execute the last order 

$    :  Background hold   perform 

*    :   The asterisk is shell Wildcard in   Match all 

?    :   The question mark is shell Wildcard in   Match a character other than carriage return 

;    ： Semicolon can be used in shell Execute multiple commands on one line , Commands are divided directly with semicolons 

|    ：  Pipe,   The output of the previous command is used as the next command ,cat filename | grep "abc"

\   ： Escape character 

``   :   The quotation marks   Execute the command in the command  echo "today is `data +%F`" ' ' :  Single quotation marks   The string in the script should be enclosed in single quotation marks , But unlike double quotes , Single quotes do not interpret variables  ""  :  Double quotes   Strings that appear in scripts can be enclosed in double quotes