isnum
Return code telling whether the input string is numerical

isnum returns an integer code depending on how it identifies the input number:

Command Line Arguments


$ isnum 2015-10-01
4
$ isnum 10:00:00
3
$ isnum 10.5
2
$ isnum 10
1
$ isnum abc
0

0	string is not any sort of number
1	String is an integer
2	String is a floating point number
3	String is a hh:mm:ss.ss time
4	String is a yyyy-mm-dd date