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Full Discussion: If not equal to then loop
Top Forums Shell Programming and Scripting If not equal to then loop Post 302628167 by gmears on Monday 23rd of April 2012 04:32:00 AM
Old 04-23-2012
If not equal to then loop

How do I go about amending this simple script that prompts for a yes/no response so that if neither Y or N are entered it will loop back back to the original prompt

Code:
#!/bin/ksh
echo "Enter yes of no"
read answer
if [ $answer == y -o $answer == Y ]
then
  echo "You selected yes"
elif [ $answer == n -o $answer == N ]
then
  echo "You selected no"
elif [ $answer != y -o $answer != Y -o $answer != n -o $answer != N ]
then
  echo "Invalid Option"
fi

Thanks
Moderator's Comments:
Mod Comment Welcome to the UNIX and Linux Forums. Please use [code] tags. Video tutorial on how to use them

Last edited by Scrutinizer; 04-23-2012 at 05:50 AM.. Reason: code tags
 

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CONTINUE(P)						     POSIX Programmer's Manual						       CONTINUE(P)

NAME
continue - continue for, while, or until loop SYNOPSIS
continue [n] DESCRIPTION
The continue utility shall return to the top of the smallest enclosing for, while, or until loop, or to the top of the nth enclosing loop, if n is specified. This involves repeating the condition list of a while or until loop or performing the next assignment of a for loop, and re-executing the loop if appropriate. The value of n is a decimal integer greater than or equal to 1. The default shall be equivalent to n=1. If n is greater than the number of enclosing loops, the outermost enclosing loop shall be used. OPTIONS
None. OPERANDS
See the DESCRIPTION. STDIN
Not used. INPUT FILES
None. ENVIRONMENT VARIABLES
None. ASYNCHRONOUS EVENTS
Default. STDOUT
Not used. STDERR
The standard error shall be used only for diagnostic messages. OUTPUT FILES
None. EXTENDED DESCRIPTION
None. EXIT STATUS
0 Successful completion. >0 The n value was not an unsigned decimal integer greater than or equal to 1. CONSEQUENCES OF ERRORS
Default. The following sections are informative. APPLICATION USAGE
None. EXAMPLES
for i in * do if test -d "$i" then continue fi echo ""$i"" is not a directory. done RATIONALE
None. FUTURE DIRECTIONS
None. SEE ALSO
Special Built-In Utilities COPYRIGHT
Portions of this text are reprinted and reproduced in electronic form from IEEE Std 1003.1, 2003 Edition, Standard for Information Technol- ogy -- Portable Operating System Interface (POSIX), The Open Group Base Specifications Issue 6, Copyright (C) 2001-2003 by the Institute of Electrical and Electronics Engineers, Inc and The Open Group. In the event of any discrepancy between this version and the original IEEE and The Open Group Standard, the original IEEE and The Open Group Standard is the referee document. The original Standard can be obtained online at http://www.opengroup.org/unix/online.html . IEEE
/The Open Group 2003 CONTINUE(P)
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