* NEWS: Add mention. * cli/cli-cmds.c (init_cli_cmds): Remove xdb_commands condition on adding "!" command, always add it. * cli/cli-decode.c (find_command_name_length): Recognize "!" as a command of length one. doc/ * gdb.texinfo (Shell Commands): Document "!". testsuite/ * gdb.base/shell.exp: New file.