Shell (vii) wildcard characters and special symbols

1. Wildcard characters in the shell environment

* 0 to multiple arbitrary characters

? An arbitrary character

[] a character in parentheses

[-] All characters in the sequence

[^] a character, and a character that is not in parentheses

2. Special symbols

# comment Symbols

\ Escape Symbol

| Pipeline

; Continuous command delimiter

~ User home Folder

$ variable Leader

& Operation Control. Background work

! Logical operation "NON"

/directory symbol, PATH delimited

>> output data stream Redirect, replace, accumulate

<, << input data flow redirection

' Single quotation marks. Do not make variable substitution

"" double quotation marks. Variable substitution possible

"Two" ' is the middle of a command that can be executed first. function with $ ()

() "(" and ")" for the beginning and end of the shell

A command block combination between {} ' {' and '} '

Shell (vii) wildcard characters and special symbols