R54 is a bugfix release with moderate new features:

• Simplify and improve code and manual page
• Try GCC 5’s new -malign-data=abi
• Allow interrupting builtin cat even on fast devices (LP#1616692)
• Update to Unicode 9.0.0
• Correct English spelling
• Handle set -e-related error propagation in || and && constructs correctly
• Initialise memory for RNG even when not targetting Valgrind
• Shrink binary size
• Improve support for the contemporary pcc compiler
• Fix side effects with lazy evaluation; spotted by ormaaj
• New flags -c (columnise), -l, -N for the print builtin
• Fix English, spelling mistakes, typos in the manpage
• Return 128+SIGALRM if read -t times out, like GNU bash
• Install both manpages from Build.sh
• Document case changes are ASCII-only
• Begin porting to Harvey-OS and APEX (similar to Plan 9 and APE)
• More infrastructure for the OS/2 (EMX, KLIBC) port