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| 1 | #!/bin/sh | |
| 2 | ||
| 3 | # Nothing up my sleeve... | |
| 4 | unset ANSWER | |
| 5 | ||
| 6 | - | # dupe stdout (fd 1) to a new fd, which we call TERM_OUT (redirection) |
| 6 | + | # dupe stdout (fd 1) to fd 4 (using redirection) |
| 7 | - | # change the shell's idea of what stdout is to be TERM_OUT (exec) |
| 7 | + | # change the shell's idea of what stdout is to be fd 4 (exec) |
| 8 | - | exec {TERM_OUT}>&1
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| 8 | + | exec 4>&1 |
| 9 | ||
| 10 | # set-up a command substitution | |
| 11 | # the command is a subshell expression, with redirection applied | |
| 12 | - | # the redirection dupes stdout again, calling the new fd $OOB here |
| 12 | + | # the redirection dupes stdout again, on to fd 3 |
| 13 | # the subshell itself invokves dialog(1) | |
| 14 | # we apply redirection to this to put dialog's output back on the terminal | |
| 15 | - | # and we tell dialog to send its results to the $OOB fd we opened earlier |
| 15 | + | # and we tell dialog to send its results to the fd 3 we opened earlier |
| 16 | - | # OOB = out-of-band |
| 16 | + | ANSWER=$( ( dialog --output-fd 3 --inputbox 'Speak Friend and enter' 0 0 > /dev/fd/4 ) 3>&1 ) |
| 17 | - | ANSWER=$( ( dialog --output-fd $OOB --inputbox 'Speak Friend and enter' 0 0 > /dev/fd/$TERM_OUT ) {OOB}>&1 )
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| 17 | + | |
| 18 | # Ta-da! | |
| 19 | echo ANSWER=\<$ANSWER\> |
