Linux Signals
A scannable reference for every standard POSIX/Linux process signal — SIGHUP through SIGSYS — showing each signal’s number, its default action (Term, Core, Ign, Stop, Cont), whether it can be caught, what raises it and the matching shell exit code (128+N). In your browser, free.
Every standard POSIX/Linux process signal, explained. Everything runs in your browser from a built-in reference — nothing is sent to the server.
| Signal | No. | Default action | Catchable | Description | Exit code |
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About Linux Signals
The Linux Signals reference lists every standard POSIX/Linux process signal, from SIGHUP through SIGSYS, in one scannable table. Each row shows the signal’s number, its default action — Terminate, Core dump, Ignore, Stop or Continue — whether a process can catch it, what typically raises it, and the shell exit code (128 + N) you see when a process dies from it.
That exit-code column closes the loop developers hit daily: a container that exits with 137 was killed by SIGKILL (9), a crash with 139 was a segmentation fault from SIGSEGV (11), and a clean shutdown at 143 came from SIGTERM (15). Search works by name, number, exit code or meaning, so you can start from whichever clue you have.
Two footnotes cover the parts references usually skip: the real-time signals SIGRTMIN through SIGRTMAX, which have no predefined meaning and are delivered in guaranteed order, and the architecture caveat — a few signal numbers differ on Alpha, MIPS and SPARC, which is why scripts should use symbolic names. Everything runs in your browser.
How to use Linux Signals
- Search for a signal by name (SIGKILL), number (9), shell exit code (137) or a keyword like “segmentation”.
- Read the row: number, default action, whether it can be caught, and what raises it.
- Use the exit-code column to translate a 128+N shell status back to the signal that killed the process.
- Copy the signal name or exit code with the row’s copy buttons.
- Check the notes on real-time signals and per-architecture numbering if you are writing portable scripts.