Very Computer

Hello,

I normally program in Perl, today I'm in ksh.  Having some trouble...

I want to assign my second parameter for my program based on whether it is a
number or not.

I tried:
FILENM=$1
if [[ -z "$2" || "$2" != /^\d+$/ ]] then
    QUEUE=$2
    WIDTH=$3
    PGLINES=$4
else
    WIDTH=$2
    PGLINES=$3
fi

Hopefully you can see I thought I'd use a regexp to determine if its a number or
not.  This didn't work.  Probably because I'm guessing on the regexp format for
ksh.  Any help, or perhaps a better way to solve my problem?

--
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Phil R Lawrence               phone: 610-758-3051

194 Lehigh University Computing Center
E.W. Fairchild - Martindale, Bldg. 8B
Bethlehem, PA  18018
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

Quote:> Hello,

> Hopefully you can see I thought I'd use a regexp to determine if its a number or
> not.  This didn't work.  Probably because I'm guessing on the regexp format for
> ksh.  Any help, or perhaps a better way to solve my problem?

Christian
--
Christian Bauernfeind
Not speaking for Siemens
Not even working for IBM

Hope that helps,
Douglas Wilson

: I want to assign my second parameter for my program based on whether it is a
: number or not.

# isnum returns True if its argument is a valid number.
# The first pattern requires a digit before the decimal
# point, and the second after the decimal point.
function isnum # string
{
    case $1 in
    ?([-+])+([0-9])?(.)*([0-9])?([Ee]?([-+])+([0-9])) )
        return 0;;
    ?([-+])*([0-9])?(.)+([0-9])?([Ee]?([-+])+([0-9])) )
        return 0;;
    *) return 1;;
    esac
    # Not reached.

Quote:}

-Brian

: ...
: if [[ -z $2 || $2 != +([[:digit:]]) ]]; then]

That's a ksh93 extension to comply with the POSIX standard.

-Brian