isnum (1) - Linux Manuals
Command to display isnum manual in Linux: $ man 1 isnum
Name
isnum - Return code telling whether the input string is numerical
Synopsis
isnum string
Description
isnum
is a utility for identifying and classifying an input string.
<B>isnum</B> returns an integer code depending on how it identifies the
input number:
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
Author
Jessica Mink, SAO (jmink [at] cfa.harvard.edu)