(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, <op**********@yahoo.ca>
Toronto, Ontario, Canada 6 3368
In <comp.unix.shell> William Park <op**********@yahoo.ca> wrote: (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
Typo... I pasted an old example. No globbing or any shell expansion is
done.
try
echo a
raise 2
echo b
done in
0) echo okey ;;
1) echo raised 1 ;;
2) echo raised 2 ;;
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, <op**********@yahoo.ca>
Toronto, Ontario, Canada
In article <2n************@uni-berlin.de>,
William Park <op**********@yahoo.ca> wrote:
.... Next feature I'll tackle is list comprehension. :-)
Are you saying that you don't understand how lists work?
If so, post an item here - I'm sure people will be more than willing to help.
William Park wrote: try echo a raise 2 echo b done in 0) echo okey ;; 1) echo raised 1 ;; 2) echo raised 2 ;; *) echo really bad ;; esac
try...done...esac? What a delightfully eclectic combination
of syntax. :-)
Why doesn't it end with 'yrt'?
--
Greg Ewing, Computer Science Dept,
University of Canterbury,
Christchurch, New Zealand http://www.cosc.canterbury.ac.nz/~greg
In <comp.unix.shell> Greg Ewing <gr**@cosc.canterbury.ac.nz> wrote: William Park wrote: try echo a raise 2 echo b done in 0) echo okey ;; 1) echo raised 1 ;; 2) echo raised 2 ;; *) echo really bad ;; esac
try...done...esac? What a delightfully eclectic combination of syntax. :-)
Why doesn't it end with 'yrt'?
'try-done' was chosen because it resembles while-loop where you would
break out of; and, '-in-esac' was chosen because it resembles case
statement. Also, I didn't want to introduce too many new keywords.
--
William Park, Open Geometry Consulting, <op**********@yahoo.ca>
Toronto, Ontario, Canada This thread has been closed and replies have been disabled. Please start a new discussion. Similar topics
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