isogmt − Run GMT command or script in isolation mode
isogmt runs a single GMT command or shell script in isolation mode. This means that the files .gmtcommands4 and .gmtdefaults4 will be read from the usual locations (current directory, ~/.gmt, or home directory), but changes will only be written in a temporary directory, which will be removed after execution. The name of the temporary directory will be available to the command or script as the environment variable GMT_TMPDIR.
Run the shell script script.gmt in isolation mode
isogmt sh script.gmt