I want to use "Formchk" utility in Gaussian. How do I write the job script?

You can use commands written the Users's Reference. Please write this command to the job script file and submit.
Utility Programs

[Example] If "water.chk" on current directory changes "water.fchk", please write following script to the job script file.

${g09root}/g09/formchk water.chk water.fchk