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Arithmetic Expansion in Bash
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I-Man Ng 2019-05-09 20:17:21 +08:00 committed by GitHub
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@ -1064,6 +1064,21 @@ helloworld
## Math ## Math
[[back to top](#handy-bash-oneliner-commands)] [[back to top](#handy-bash-oneliner-commands)]
##### Arithmetic Expansion in Bash (Operators: +,-,*,/,%,etc)
```bash
echo $(( 10 + 5 )) #15
x=1
echo $(( x++ )) #1 , notice that it is still 1, since it's post-incremen
echo $(( x++ )) #2
echo $(( ++x )) #4 , notice that it is not 3 since it's pre-incremen
echo $(( x-- )) #4
echo $(( x-- )) #3
echo $(( --x )) #1
x=2
y=3
echo $(( x ** y )) #8
```
##### Print out the prime factors of a number (e.g. 50) ##### Print out the prime factors of a number (e.g. 50)
```bash ```bash
factor 50 factor 50