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Redirecting stdout output to whiptail menu box

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Old 08-11-2018
Redirecting stdout output to whiptail menu box
As a result of whiptail menu option I am getting a data from a file.

Naturally it is output to terminal as stdour.



I like to redirect the output back to the menu.

It can be done with single input of line of text , see attached.


I just cannot see where or how the sample attached

"swaps the stdout and stderr."









Quote:
A way to get free-form input from the user is via an input box. This displays a dialog with two buttons labelled Ok and Cancel.
COLOR=$(whiptail --inputbox "What is your favorite Color?"
8 78 Blue --title "Example Dialog" 3>&1 1>&2 2>&3)
# A trick to swap stdout and stderr. # Again, you can pack this inside if, but it seems
really long for some 80-col terminal users. exitstatus=$? if [ $exitstatus = 0 ]; then echo "User selected Ok and entered " $COLOR else echo "User selected Cancel." fi echo "(Exit status was $exitstatus)"

Addendum

I am not sure what happen with the quite , it was part text part code Here it is agan as code



Code:

COLOR=$(whiptail --inputbox "What is your favorite Color?" 8 78 Blue --title "Example Dialog" 3>&1 1>&2 2>&3)                                                                         # A trick to swap stdout and stderr. # Again, you can pack this inside if, but it seems really long for some 80-col terminal users. exitstatus=$? if [ $exitstatus = 0 ]; then     echo "User selected Ok and entered " $COLOR else     echo "User selected Cancel." fi  echo "(Exit status was $exitstatus)"

------ Post updated at 10:32 PM ------

I found answer here

BASH Programming - Introduction HOW-TO: All about redirection

------ Post updated 08-11-18 at 12:30 PM ------

OK, I jumped the gun.

I do understand the principle of redirecting , read "the book".

Unfortunately the book numbers the descriptors 0 thru 2 and the code I am using goes 1 thru 3 .

So which way is up ?



Or can I just use names such as "stdout" instead?



Code:
#file descriptors 0, 1 and 2 also known as 
 204 # 0 standard input (stdin), 
 205 # 1 standard output (stdout) 
 206 # 2 and standard error (stderr). 
 207 #or ? 
 208 # 1 stdin 
 209 # 2 stdout 
 210 # 3 error 
 211 foobar=$(whiptail --inputbox "REDIRECT TEST Enter some text" 10 30\
 212  3>&1 1>&2 2>&3)
 213 # error to input  
 214 # input to output 
 215 # output to error

Last edited by annacreek; 08-10-2018 at 11:24 PM..
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