Package: expect Version: 5.45.4-2+b1 unbuffer(1) ignores errors from programs that were killed by a signal:
$ perl -e 'use POSIX; raise(SIGABRT)' Aborted $ echo $? 134 $ unbuffer perl -e 'use POSIX; raise(SIGABRT)' $ echo $? 0 -- System Information: Architecture: i386 Versions of packages expect depends on: ii tcl8.6 8.6.12+dfsg-1+b1 ii libc6 2.35-4 ii libtcl8.6 8.6.12+dfsg-1+b1 ii tcl-expect 5.45.4-2+b1 -- Jakub Wilk