Shell Special Symbols

* Wildcard characters
? Compared with *, to match a
# comment out, do not take effect
\ de-signifier symbol
touch \ #1. txt
ls \ #1. txt
| A pipe character throws the result of a command to the next command
$ variable prefix (when you get, use the variable, add the symbol)
; Often used in the middle of two commands such as: LS 1.txt; LS 2.txt
~ User Home Directory
& Throw a command to the background such as: Sleep &
> Redirect >> Chase-weighted redirect 2> error redirect 2>> error append redirect
< Reverse redirect (the contents of the right document are redirected to the left command, such as Wc-l < 1.txt)
[] Two command set ls [12].txt equals ls 1.txt 2.txt regular expression is often used to define the range

Small Knowledge:
(1) If you want to create a file named #1.txt, then you need to touch \ #1. txt, using the caret.

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Shell Special Symbols