(patch for Bash) try-block and exception

From: William Park (opengeometry_at_yahoo.ca)
Date: 07/31/04 

Date: 31 Jul 2004 18:44:06 GMT

    (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@yahoo.ca>
Toronto, Ontario, Canada

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