Hi, case statements cannot use regular expressions, they use pattern matches, which have a different syntax.
Since there is no specification in this thread of what shell is going to be used, this is the best option, because a case statement works in any POSIX shell or even Bourne shell.
If your shell supports regex (modern Bash, ksh93, zsh) then you could do this (using the original example):
Code:
trap clear EXIT
DIALOG=${DIALOG=dialog}
while :
do
rfcval=$($DIALOG --title "RFC NUMBER" --clear \
--inputbox "Please enter an RFC Number" 16 17 2>&1 >/dev/tty)
retval=$?
case $retval in
0)
if [[ $rfcval =~ ^[0-9]{5,}$ ]]; then
echo "RFC Number: $rfcval" >> $accessfile
break
elif [[ $rfcval =~ ^(N/A|n/a)$ ]]; then
break
fi ;;
1)
exit 1;;
255)
rm -f "$accessfile" "$tempfile" "$sitefile"
exit 1 ;;
esac
done
exit 0
-- edit --
Just noticed the thread title mentions bash, oh well ...
Last edited by Scrutinizer; 03-19-2017 at 06:18 AM..
This User Gave Thanks to Scrutinizer For This Post:
Hello,
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I was trying to generate GUI using shell script. After long search I found the utility called “dialog”. Using this utility I am able to generate window to collect the input.
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Discussion started by: shrout1
5 Replies
LEARN ABOUT POSIX
exit
EXIT(P) POSIX Programmer's Manual EXIT(P)
NAME
exit - cause the shell to exit
SYNOPSIS
exit [n]
DESCRIPTION
The exit utility shall cause the shell to exit with the exit status specified by the unsigned decimal integer n. If n is specified, but
its value is not between 0 and 255 inclusively, the exit status is undefined.
A trap on EXIT shall be executed before the shell terminates, except when the exit utility is invoked in that trap itself, in which case
the shell shall exit immediately.
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
The exit status shall be n, if specified. Otherwise, the value shall be the exit value of the last command executed, or zero if no command
was executed. When exit is executed in a trap action, the last command is considered to be the command that executed immediately preceding
the trap action.
CONSEQUENCES OF ERRORS
Default.
The following sections are informative.
APPLICATION USAGE
None.
EXAMPLES
Exit with a true value:
exit 0
Exit with a false value:
exit 1
RATIONALE
As explained in other sections, certain exit status values have been reserved for special uses and should be used by applications only for
those purposes:
126 A file to be executed was found, but it was not an executable utility.
127 A utility to be executed was not found.
>128 A command was interrupted by a signal.
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 EXIT(P)
03-19-2017
...