[q] running brunch from bash-script

I am trying to compile my own version of AICP on a little server I rented, but as the build process interrupts from time to time, but everything builds fine, after i repeated the brunch command several times, i want to write a bash-script that repeats the brunch command until the build process is finished successfull. Everything on that script works so far except one important thing, when the brunch command should be executed, it just tells me that the command wasnt found, although i run . build/envsetup.sh through that script before. Is there any way i can use brunch inside a shell script? Google didnt give me a solution on that