"if else" to read characters and make some optional output

I need a shell script for android that can read some characters, for example 0,1,2,3,4,5 inside /system/boom.sh file and i want to create some option like

If 0,1,2,3,4,5 inside /system/boom.sh then bang in /system/log.sh  
If 0,1,2,3,4,6 inside /system/boom.sh then bing in /system/log.sh  
Else bung in /system/log.sh  

The Script is for Android not for Li