## [Bash][1] and shell utils 20 bytes## compgen -b|head -1ドル You can save that in a file with execute permissions (builtins) and run it under bash like this: $ ./builtins 5 . : [ alias bg Outputs the first N bash built ins. If you are running some shell other than bash, you will need the shebang #!/bin/bash line at the start of the file, for +12b [1]: https://www.gnu.org/software/bash/