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

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...