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- catch command ?varName?
- The catch command may be used to prevent errors from
- aborting command interpretation. Catch calls the Tcl
- interpreter recursively to execute command, and always
- returns a TCL_OK code, regardless of any errors that
- might occur while executing command. The return value
- from catch is a decimal string giving the code returned
- by the Tcl interpreter after executing command. This
- will be 0 (TCL_OK) if there were no errors in command;
- otherwise it will have a non-zero value corresponding
- to one of the exceptional return codes (see tcl.h for
- the definitions of code values). If the varName
- argument is given, then it gives the name of a
- variable; catch will set the value of the variable to
- the string returned from command (either a result or an
- error message).
-