Some comparison tests in the shell condition

1> file Comparison:

-d filename checks if filename exists and is a directory

-e filename checks if filename exists

-F filename checks if filename exists and is a file

-r filename checks if filename exists and is readable

-s filename Check if filenmae exists not empty

-W filename checks if filename exists and can be written

-x filename checks if filename exists and executes

-o filename checks if filename exists and is owned by the current user

-G filename checks if filename exists and the default group is the same as the current user

File1-nt file2 Check if file1 is newer than file2

File1-ot file2 Check if file1 is older than file2

2> Numerical comparison

N1-eq n2 Check if N1 is equal to N2

N1-ge n2 Check if N1 is greater than or equal to N2

N1-GT n2 Check if N1 is greater than N2

N1-le n2 Check if N1 is less than or equal to N2

N1-LT n2 Check if N1 is less than N2

N1-ne n2 Check if N1 is not equal to N2

3> string comparison

STR1 = str2 Check if str1 is the same as str2

Str1! = str2 Check if str1 is different from str2

STR1 < str2 Check if STR1 is smaller than str2

str1 > STR2 Check if str1 is larger than str2

-N str1 Check if the length of the str1 is not 0

-Z str2 Check if the length of the str1 is 0

Some comparison tests in the shell condition