Shell common file, string, two-tuple integer test operator-Continuous update

Frequently used file test operators-ongoing updates

- e -- exist	File exists is True
- F -- file	File exists and is true for normal files
- D -- Directory	File exists and is directory-True
-s--size	The file exists and the size is not zero for true
-r--read	File exists and can be read as true
-w--write	File exists and can be written as true
-x--executable	File exists and can be executed as true
-l--link	The file exists and is true for the linked file
F1-nt f2--new than	F1 than F2 new is true
F1-ot F2--old than	F1 is true compared to F2 old

Common string test operators-in continuous update

-N "String"	No zero if the length of the string is not 0, it is true
-Z "string"	Zero if the string has a length of 0, it is true
"String 1" = "String 2"	True if string 1 equals string 2, "= =" can be used instead of
"String 1"! = "String 2"	True if string 1 is not equal to string 2
Common two-dollar integer test operator-Continuous update
Use in [] and test	(())、[[]]	Description
-eq	=	equals, equal.
-ne	!=	Not equal to, no equal
-gt	>	Greater than, greater than
-ge	>=	Greater than or equal, greater equal
-lt	<	Less than
-le	<=	Less than or equal equal
Note: When using "<" > "in [], you need to escape with" \ ", otherwise an error will occur. logical operators
[] and test are used	[[]] and &&	Description
-A	&&	And, with, both sides are true, the result is true
-O	||	Or, or, one of the two sides is true, the result is true
！	！	Not, non, different on both sides, the result is true

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Shell common file, string, two-tuple integer test operator-Continuous update