Effective Shell is an ebook on shell scripting principles1.
unix-shell-script-tactics is a shell style guide that lays out common script patterns.
ShellCheck is a linter for shell scripts.
dylanaraps/pure-sh-bible - A collection of pure POSIX sh alternatives to external processes.
Appending multiple lines to a file
tee -a FILE << EOF > /dev/null
echo "line 1"
echo "line 2"
EOF
Start custom scripts with ‘,’
If you create custom scripts in a PATH’d bin directory, prepend them with a , to keep them separate from the standard binaries and also allow easy access via tab completion2.
Get path relative to script path
script_root = $(dirname $(realpath $0))