(patch for Bash) try-block and exception

William Park opengeometry at yahoo.ca
Sat Jul 31 20:44:06 CEST 2004


    (crossposted to comp.lang.python, because this may be of interest to
    them.)

Python has try-block, within which you can raise exception.  Once it's
raised, execution breaks out of the try-block and is caught at the end
of try-block.

Now, Bash has similiar feature.  I've added try-block and 'raise'
builtin into Bash-3.0.  Typical usage would go something like
    try
	echo a
	raise
	echo b
    done
or
    try 
	echo a
	raise 2
	echo b
    done in
	0) echo okey ;;
	1) echo raised 1 ;;
	2) echo raised 2 ;;
	*) echo really bad ;;
    esac

The exception is positive integer and is raised by 'raise' builtin, just
like 'break' for the for/while/until loops.  And, it can be caught by
using optional case-like statement.

Ref:
    http://freshmeat.net/projects/bashdiff/
    help try
    help raise

-- 
William Park, Open Geometry Consulting, <opengeometry at yahoo.ca>
Toronto, Ontario, Canada



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