Been trying to build a menu with whiptail lately. However, my code doesn't seems to be working even though when i compared to other similar code they looks the same.
Code:
#!/bin/bash
clear
whiptail --msgbox "Entering networking sub-menu" 20 78
whiptail --title Networking --menu "Make your choice" 16 78 5 \
"1)" "Display info"
while read CHOICE
do
case $CHOICE in
1) ./displayinfo.sh
esac
done
when i choose on the choice, it only appear this.
can anyone help me spot the mistake?
Last edited by Scrutinizer; 07-12-2014 at 12:16 PM..
Reason: CODE tags
You need to find out how the second whiptail writes its output. Somehow the output of the second whiptail command needs to be fed into the while-read loop. There is not input into that loop here. Perhaps through a pipe symbol (if that command outputs on stdout)?
--
A short look at the man page of whiptail and the menu option, says it's outputting on stderr. But it also needs stdout to go to the terminal, so a pipe cannot be used)
===EDIT===
(corrected previous sentence (thanks Don). I originally said "background" there, which is wrong I meant "subshell". But also that is not really relevant. What matters is that pipe cannot be used like that, because the command needs stdout to go directly to the terminal..)
So try something like:
Code:
.....
whiptail --title Networking --menu "Make your choice" 16 78 5 \
"1)" "Display info" 2>somefile
CHOICE=$(cat somefile)
case $CHOICE in
"1)") ./displayinfo.sh
esac
Last edited by Scrutinizer; 07-13-2014 at 04:39 AM..
Reason: Corrected background to subshell. Thanks Don...
I have no experience with whiptail other than reading the man page, but I think Scrutinizer is close on the solution to your problem. I am, however, a little confused by his implication that commands in a pipeline are run in the background. Pipelines are run in the foreground unless the pipeline is terminated with an & (which runs all commands in a pipeline in the background).
But, it appears from the man page (although not explicitly stated) that standard output from whiptail is supposed to be the terminal. So, the output of whiptail can't be connected to a pipe. The man page also says that the exit status needs to be checked to determine whether a yes/OK, no/cancel, or error or interrupt was detected. My guess (with no testing since my system doesn't have the whiptail command) would be that you want something like:
Code:
#!/bin/bash
clear
whiptail --msgbox "Entering networking sub-menu" 20 78
trap 'rm -f choice$$' EXIT
while whiptail --title Networking --menu "Make your choice" 16 78 5 \
"1)" "Display info" "2)" "Another option" "3)" "something else" 2> choice$$
do read CHOICE < choice$$
case $CHOICE in
("1)") ./displayinfo.sh;;
(*) whiptail --msgbox "To Be Implemented." 20 78;;
esac
done
The 2>file redirects the standard error output from that command to the file named file.
This User Gave Thanks to Don Cragun For This Post:
You could also try this as a way without an intermediate file, using the fact that in a command substitution stderr is directed to the the terminal. So if we flip stdout and stderr then all should be well:
[..] I am, however, a little confused by his implication that commands in a pipeline are run in the background. Pipelines are run in the foreground unless the pipeline is terminated with an & (which runs all commands in a pipeline in the background).
Hi Don. I meant to say subshell instead of background, but even that is not relevant, what is relevant is that its stdout cannot go to the terminal, which it needs control of. I corrected it in my post. Thanks...
Last edited by Scrutinizer; 07-13-2014 at 05:25 AM..
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07-12-2014
