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isnum2()
{
case "$1" in
'[-+]' | '') return 1;; # empty or bare `-' or `+'
[-+]*[!0-9]*) return 1;; # non-digit with leading sign
[-+]*) return 0;; # OK
*[!0-9]*) return 1;; # non-digit
*) return 0;; # OK
esac
}
# this one handles floating point
isnum3()
{
case "$1" in
'') return 1;; # empty
*[!0-9.+-]*) return 1;; # non-digit, +, -, or .
*?[-+]*) return 1;; # sign as second or later char
*.*.*) return 1;; # multiple decimal points
*) return 0;; # OK
esac
}