If you update a script in a production environment and want to check whether the syntax is still correct without executing it, you can call it this way:
# sh -n myshellscript
or you can add the following at the beginning of the script:
This will have the shell read the script but not execute it. It will then output error messages for all syntax errors found e.g.:
# sh -n myshellscript myshellscript: line 61: syntax error near unexpected token `else' myshellscript: line 61: ` else'
Please note that an interactive shell might ignore set -n when executing commands interactively.