Confusion about basic bashscript loop - until/done

Question

I have a bash script I'm working on to help with an installer. why doesn't this work?

function fn_myFunc(){
        local MYVAR=0
        until ["$MYVAR" -ne 0]; do
                whiptail --yesno "Yes or No?" --no-button "No" --yes-button "Yes" 10 70
                MYVAR=$?
                echo $MYVAR
        done
}

This code loops infinitely, even though if Yes is selected, the echo $MYVAR prints out 0 and it prints 1 if no is selected.

score 1 · Accepted Answer · answered Nov 26 '14 at 14:12

1

It should also report

-bash: [: missing `]'

or

-bash: [0: command not found

Insert whitespace where needed. In bash, [[ ... ]] conditions are generally easier to use than [ ... ].

answered Nov 26 '14 at 14:12

choroba

47,233

Where would that go? How do enable errors like that? – USERID_UNK Nov 26 '14 at 14:14
@USERID_UNK: I see it in the terminal, it goes to the standard error. – choroba Nov 26 '14 at 14:14
is there a link you could suggest for where to learn what the difference between [] and [[]] is in bash? – USERID_UNK Nov 26 '14 at 14:16
@USERID_UNK: man bash of course, maybe also Bash Hackers or Advanced Bash Scripting Guide. – choroba Nov 26 '14 at 14:19
oh for future readers, I found this: http://stackoverflow.com/questions/3427872/whats-the-difference-between-and-in-bash – USERID_UNK Nov 26 '14 at 14:23

Confusion about basic bashscript loop - until/done

1 Answers1