Shell Test Value string file comparison

A comparison of the numerical values	Describe
N1–eq N2	As
N1–GT N2	Greater than
N1–ge N2	Much more than
N1–lt N2	Less than
N1–le N2	As small as
N1–ne N2	Not equal to

string comparison	Describe
STR1 = str2	As
Str1! = str2	Not equal to
STR1 < STR2	Less than (must be used by definition)
str1 > STR2	Greater than (must be used by definition)
-N str1	Whether the length is not 0
-Z str1	is the length 0

File comparison	Describe
-D File	A catalogue?
-E File	Exist?
-F File	File?
-R File	exist and can read?
-S file	Existence is not empty?
-W File	exist and can write?
-X File	exists and is available to execute?
-0 file	A former user?
-6 file	is the default value the same as the previous user?
File1–nt File2	File1 is newer than file2
File1–ot File2	is file1 better than file2?

Shell Test Value string file comparison