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Your first line should have a slash in front of bin:
You should verify /bin/sh is the one you want - on many systems it is a symbolic link to another shell (e.g. bash or dash) and sometimes shells (e.g. dash) don't do things the way you think they do in other shells.
Most of your errors stem from the common problem in cron and other background jobs: That is that the environment variables are not set the same way they are when you run from a login session. Cron has a very minimal environment. The main variable you need is PATH as that tells it where to find commands. If you notice in your output it says it can't find various commands.
You can set variables in the script for example:
Alternatively you can put the full path of commands in the script for example:
/bin/tar -cvzf inst.tar.gz inst
tar -cvzf inst.tar.gz inst
There may be other variables you need to set. For example if it were Oracle you'd need to set things like ORACLE_HOME so that the sql commands you ran knew the Oracle environment.