It will enquire about the current environment and put the output into a file called monitor.sh in whichever directory is current at the time the command is issued (hopefully not the same directory as your script of that name). It will however be useful to compare the results of "env" from cron against "env" from the command prompt, paying particular attention to PATH.
If your cron runs there will be entries in the cron log (usually /usr/adm/cron/log).
If the cron runs and produces an untrapped error message the error message will be in the mail file for the user who owns the cron (which in this case looks like root).
Reply to the question about "env".
From the command prompt, just type "env". It will tell you what environment variables have been set during the login process. See "man login" for the full process.
To find out the environment in cron just create a one-time cron containing just and "env" command. The output will be in mail for the user owning the cron. You will see that the environment is quite limited and your script may need to add to the environment to work.