A collection of dos and don’ts for writing bash scripts: <https://github.com/azet/community_bash_style_guide>. Some tips are not bash-specific, but are about external commands usable with any shell: e.g. awk, sed, grep, pgrep, xargs. Also some builtins should be available with any POSIX-compliant shell, e.g. getopts, printf. Most surprising bit of information: that someone has written a “ctypes” (foreign-function interface) addon for bash <https://github.com/taviso/ctypes.sh>.