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At least for GNU, it is valid to prefix the signal specification with SIG. cf. https://github.com/coreutils/coreutils/blob/master/src/operand2sig.c#L69 https:/

At least for GNU, it is valid to prefix the signal specification with SIG. cf. https://github.com/coreutils/coreutils/blob/master/src/operand2sig.c#L69 https://github.com/coreutils/coreutils/blob/master/src/opera... Appears to be the case for BSD as well: https://github.com/freebsd/freebsd/blob/master/bin/kill/kill.c#L163 https://github.com/freebsd/freebsd/blob/master/bin/kill/kill...

jwilk 9y ago
The SIG prefix doesn't work in dash (the default shell in Debian). POSIX¹ says: An early proposal also required symbolic signal_names to be recognized with or without the SIG prefix. Historical versions of kill have not written the SIG prefix for the -l option and have not recognized the SIG prefix on signal_names. Since neither applications portability nor ease-of-use would be improved by requiring this extension, it is no longer required. ¹ http://pubs.opengroup.org/onlinepubs/9699919799/utilities/kill.html#tag_20_64_18 http://pubs.opengroup.org/onlinepubs/9699919799/utilities/ki...