 | Chapter 4 The Bourne Shell and Korn Shell |  |
| Chapter 4 The Bourne Shell and Korn Shell | |
The Korn shell's let command performs integer arithmetic. The Korn shell provides a way to substitute integer values (for use as command arguments or in variables); base conversion is also possible:
$(( | Use the value of the enclosed arithmetic expression. |
| Interpret integer |
The Korn shell uses arithmetic operators from the C programming language; they are listed below in decreasing order of precedence:
- | Unary minus. |
! ~ | Logical negation; binary inversion (one's complement). |
* / % | Multiplication; division; modulus (remainder). |
+ - | Addition; subtraction. |
<< >> | Bitwise left shift; bitwise right shift. |
<= >= | Less than or equal to; greater than or equal to. |
< > | Less than; greater than. |
== != | Equality; inequality (both evaluated left to right). |
& | Bitwise AND. |
^ | Bitwise exclusive OR. |
| | Bitwise OR. |
&& | Logical AND. |
|| | Logical OR. |
*= /= %= | Assignment. |
= += -= | |
<<= >>= | |
&= ^= |= |
See the let command for more information and examples.
let "count=0" "i = i + 1" Assigniandcount. let "num % 2" Test for an even number. (( percent >= 0 && percent <= 100 )) Test the range of a value.
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| 4.3 Variables |  | 4.5 Command History |
