On 7/16/17 6:59 PM, Quentin L'Hours wrote: > Hello, > > bash: 4.4.12(1)-release > stty: 8.25 (GNU version) > > When running this small script: > >> trap 'stty echo; exit 0' INT >> stty -echo >> read -d a > > and hitting Ctrl-c > > stty should be restored in the trap, but doesn't (the trap code is executed > though). > This also seems to happen with read -s and -n options.
This is pretty easy to explain. The read builtin takes great care to restore the terminal settings it changes before the shell exits. This was prompted by several bug reports over time, the last of which (the one that finally resulted in the change) is: http://lists.gnu.org/archive/html/bug-bash/2014-12/msg00151.html If the shell exits as the result of a signal, even if it exits out of a trap handler, the read builtin restores the terminal attributes that were in effect when it was invoked. Chet -- ``The lyf so short, the craft so long to lerne.'' - Chaucer ``Ars longa, vita brevis'' - Hippocrates Chet Ramey, UTech, CWRU c...@case.edu http://cnswww.cns.cwru.edu/~chet/
