Shell comparison operator

Operator	Description	Example
File comparison operator
-EFilename	IfFilenameYes, true	[-E/var/log/syslog]
-DFilename	IfFilenameIs a directory, it is true	[-D/tmp/mydir]
-FFilename	IfFilenameIs a regular file, it is true	[-F/usr/bin/grep]
-LFilename	IfFilenameIs a symbolic link, it is true	[-L/usr/bin/grep]
-RFilename	IfFilenameReadable, true	[-R/var/log/syslog]
-WFilename	IfFilenameWritable, true	[-W/var/mytmp.txt]
-XFilename	IfFilenameExecutable, true	[-L/usr/bin/grep]
Filename1-NtFilename2	IfFilename1RatioFilename2New, true	[/Tmp/install/etc/services-nt/etc/services]
Filename1-OtFilename2	IfFilename1RatioFilename2Old, true	[/Boot/bzImage-ot arch/i386/boot/bzImage]
String comparison operator[Size =-1] (please note the use of quotation marks, this is a good way to prevent space from disturbing the code)
-ZString	IfStringIf the length is zero, it is true.	[-Z "$ myvar"]
-NString	IfStringNon-zero length, true	[-N "$ myvar"]
String1=String2	IfString1AndString2Same, true	["$ Myvar" = "one two three"]
String1! =String2	IfString1AndString2Otherwise, true	["$ Myvar "! = "One two three"]
Arithmetic comparison operator
Num1-EqNum2	Equal	[3-eq $ mynum]
Num1-NeNum2	Not equal	[3-ne $ mynum]
Num1-LtNum2	Less	[3-lt $ mynum]
Num1-LeNum2	Less than or equal	[3-le $ mynum]
Num1-GtNum2	Greater	[3-gt $ mynum]
Num1-GeNum2	Greater than or equal	[3-ge $ mynum]