bash scripting: how to get item name on a radiolist using dialog

Question

I need to make a radiolist in bash script using dialog interface, for example if I have the following list:

dialog --backtitle "OS information" \
--radiolist "Select OS:" 10 40 3 \
 1 "Linux 7.2" off \
 2 "Solaris 9" on \
 3 "HPUX 11i" off

I need when the user chooses an option and presses "ok", my script could read the item's name and not the item's number.

It is possible?

Thanks!

jordanm · Accepted Answer · 2014-07-16 14:45:39Z

4

You can put your expected results in an array:

array=(Linux Solaris HPUX)
var=$(dialog --backtitle "OS infomration" \
--radiolist "Select OS:" 10 40 3 \
 1 "Linux 7.2" off \
 2 "Solaris 9" on \
 3 "HPUX 11i" off >/dev/tty 2>&1 )

printf '\n\nYou chose: %s\n' "${array[var - 1]}"

edited Jul 16, 2014 at 14:45

answered Jan 9, 2012 at 20:55

jordanm

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4 Comments

Ivan Over a year ago

I thought something similar, but there isn't a direct solution? Like for example when you use an inpunt box, where the inserted value is stored on stderr?

jordanm Over a year ago

There might be, but I do not know of one. This might be your closest solution. Someone else may chime in with an answer.

synthesizerpatel Over a year ago

This is the answer I was looking for - one caveat, the redirection syntax is backwards (common script error), it should be >/dev/tty 2>&1 I think? gnu.org/software/bash/manual/bashref.html#Redirections

jordanm Over a year ago

@synthesizerpatel - you are right, stderr wouldn't have gone to the tty. Post edited.

ANDuser · Accepted Answer · 2022-07-07 09:38:22Z

0

in Termux app >/dev/tty 2>&1 is not working, but 3>&1 1>&2 2>&3 3>&- is working perfectly.

which means: 3>&1 opens a new file descriptor which points to stdout, 1>&2 redirects stdout to stderr, 2>&3 points stderr to stdout and 3>&- deletes the files descriptor 3 after the command has been executed.

taken from:BASH: Dialog input in a variable

sooo....

array=(Linux Solaris HPUX)
var=$(dialog --backtitle "OS infomration" \
 --radiolist "Select OS:" 10 40 3 \
 1 "Linux 7.2" off \
 2 "Solaris 9" on \
 3 "HPUX 11i" off 3>&1 1>&2 2>&3 3>&- )
printf '\n\nYou chose: %s\n' "${array[$var - 1]}"

answered Jul 7, 2022 at 9:38

ANDuser

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Comments

ANDuser · Accepted Answer · 2022-07-07 13:50:28Z

man dialog

 --stdout
              Direct output to the standard output.  This option is provided
              for compatibility with Xdialog, however using it in portable
              scripts is not recommended, since curses normally writes its
              screen updates to the standard output.  If you use this option,
              dialog attempts to reopen the terminal so it can write to the
              display.  Depending on the platform and your environment, that
              may fail.

therefore:

array=(Linux Solaris HPUX)

opt=$( dialog --stdout \
 --backtitle "OS infomration" \
 --radiolist "Select OS:" 10 40 3 \
 1 "Linux 7.2" off \
 2 "Solaris 9" on \
 3 "HPUX 11i" off )

printf '\n\nYou chose: %s\n' "${array[var - 1]}"

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