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Top Forums UNIX for Dummies Questions & Answers Ksh How to test if variable is numeric?? Post 302183672 by era on Wednesday 9th of April 2008 04:23:16 PM
Old 04-09-2008
So my intuition was right there after all (-:

The thing with the "non-zero" case is I'd like to have only one place where you end up printing out a warning. I didn't want to bring it up before, but here's one attempt.

Code:
while true; do
  case $zipcode in
    00000) zipcode="force a warning on next iteration";;
    [0-9][0-9][0-9][0-9][0-9]) break;;
    *) echo "${myline}"
       echo "ZIPCODE WARNING! -> ${zipcode}" >&2
       break;;
  esac
done

The loop is really just to keep it going for one more round in the zero case. I honestly don't know if this is more elegant than two have two code branches where the warning is printed.
 

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break(1)							   User Commands							  break(1)

NAME
break, continue - shell built-in functions to escape from or advance within a controlling while, for, foreach, or until loop SYNOPSIS
sh break [n] continue [n] csh break continue ksh *break [n] *continue [n] DESCRIPTION
sh The break utility exits from the enclosing for or while loop, if any. If n is specified, break n levels. The continue utility resumes the next iteration of the enclosing for or while loop. If n is specified, resume at the n-th enclosing loop. csh The break utility resumes execution after the end of the nearest enclosing foreach or while loop. The remaining commands on the current line are executed. This allows multilevel breaks to be written as a list of break commands, all on one line. The continue utility continues execution of the next iteration of the nearest enclosing while or foreach loop. ksh The break utility exits from the enclosed for, while, until, or select loop, if any. If n is specified, then break n levels. If n is greater than the number of enclosing loops, the outermost enclosing loop shall be exited. The continue utility resumes the next iteration of the enclosed for, while, until, or select loop. If n is specified then resume at the n- th enclosed loop. If n is greater than the number of enclosing loops, the outermost enclosing loop shall be used. On this man page, ksh(1) commands that are preceded by one or two * (asterisks) are treated specially in the following ways: 1. Variable assignment lists preceding the command remain in effect when the command completes. 2. I/O redirections are processed after variable assignments. 3. Errors cause a script that contains them to abort. 4. Words that follow a command preceded by ** that are in the format of a variable assignment are expanded with the same rules as a vari- able assignment. This means that tilde substitution is performed after the = sign, and also that word splitting and file name genera- tion are not performed. ATTRIBUTES
See attributes(5) for descriptions of the following attributes: +-----------------------------+-----------------------------+ | ATTRIBUTE TYPE | ATTRIBUTE VALUE | +-----------------------------+-----------------------------+ |Availability |SUNWcsu | +-----------------------------+-----------------------------+ SEE ALSO
csh(1), exit(1), ksh(1), sh( 1), attributes(5) SunOS 5.10 17 Jul 2002 break(1)
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