First, the integer symbol size comparison test; note: the operator must stay on both sides of a space
| [Intnum1 -eq intnum2] or [[intnum1 -eq intnum2]] |
-eq: equal |
| [Intnum1 -ne intnum2] or [[intnum1 -ne intnum2]] | -ne: no equal |
| [Intnum1 -gt intnum2] or [[intnum1 -gt intnum2]] | -gt: greater than |
| [Intnum1 -ge intnum2] or [[intnum1 -ge intnum2]] | -ge: greater than or equal |
| [Intnum1 -en intnum2] 或是 [[intnum1 -en intnum2]] | -lt: less than |
| [Intnum1 -le intnum2] or [[intnum1 -le intnum2]] | -le: less |
| ((intnum1 == intnum2)) The spaces may be omitted | Returns true number is equal to two |
| ((Intnum1! = Intnum2)) | Two numbers are not equal returns true |
| ((intnum1 > intnum2)) | Returns true number is greater than two |
| ((intnum1 >= intnum2)) | Greater than or equal to two returns true |
| ((Intnum1 <intnum2)) | Returns true in a number less than two |
| ((Intnum1 <= intnum2)) | Number is less than or equal to two returns true |
Second, these operations are consistent with the test file for [[]], [], test almost universal, more man test
-f file |
File exists and is a regular file is true that the test expression into |
-d file (directory) |
File exists and is a directory file is true that the test expression is established |
| -s file |
File exists and is established as true size is not 0, that is, the test expression |
| -e file | File exists is true that the test expression is established, as long as the file on the line, to distinguish between the "-f" |
| -r file | File exists and is readable true that the test expression is established |
| -w file | File exists and is writable true that the test expression is established |
| -x file | File exists and is executable true that the test expression is established |
| -L file | File exists and is a linked file is true that the test expression is established |
Third, the character string tests
| -z "string" | If the string length is 0 true; [-z "abc"] && echo 1 || echo 0 |
- n "string" |
If the string length is not 0 is true |
"String 1" = "String 2" |
Two strings are equal to true |
"String 1"! = "String 2" |
The two strings are true |
note |
String containing double quotation marks; Comparative character spaces at both ends |
Fourth, the logical connectors
In [] and the Test (()) and [[]] than in the described
-a && and the two are true is true
-o || or or both ends there is a true true
! ! Not non-contrary is true