add if loop

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onceupon 2018-05-31 16:07:50 +08:00 committed by GitHub
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@ -784,8 +784,11 @@ while [[ $(pidof perl) ]];do echo f;sleep 10;done && python timetorunpython.py
```
##### If loop
```bash
# if and else loop for string matching
if [[ "$c" == "read" ]]; then outputdir="seq"; else outputdir="write" ; fi
```
if (($j==$u+2))
#(( )) use for arithmetic operation
```