gNU Bourne-Again SHell (GNU Bourne-Again SHell)
Сигналы (Signals)
When bash is interactive, in the absence of any traps, it ignores
SIGTERM (so that kill 0 does not kill an interactive shell), and
SIGINT is caught and handled (so that the wait builtin is
interruptible). In all cases, bash ignores SIGQUIT. If job
control is in effect, bash ignores SIGTTIN, SIGTTOU, and SIGTSTP.
Non-builtin commands run by bash have signal handlers set to the
values inherited by the shell from its parent. When job control
is not in effect, asynchronous commands ignore SIGINT and SIGQUIT
in addition to these inherited handlers. Commands run as a
result of command substitution ignore the keyboard-generated job
control signals SIGTTIN, SIGTTOU, and SIGTSTP.
The shell exits by default upon receipt of a SIGHUP. Before
exiting, an interactive shell resends the SIGHUP to all jobs,
running or stopped. Stopped jobs are sent SIGCONT to ensure that
they receive the SIGHUP. To prevent the shell from sending the
signal to a particular job, it should be removed from the jobs
table with the disown builtin (see SHELL BUILTIN COMMANDS below)
or marked to not receive SIGHUP using disown -h.
If the huponexit shell option has been set with shopt, bash sends
a SIGHUP to all jobs when an interactive login shell exits.
If bash is waiting for a command to complete and receives a
signal for which a trap has been set, the trap will not be
executed until the command completes. When bash is waiting for
an asynchronous command via the wait builtin, the reception of a
signal for which a trap has been set will cause the wait builtin
to return immediately with an exit status greater than 128,
immediately after which the trap is executed.
