$ curl cheat.sh/
# ksh
# Korn Shell, a Bash-compatible command-line interpreter.
# See also: `histexpand`.
# More information: <http://kornshell.com>.

# Start an interactive shell session:
ksh

# Execute specific [c]ommands:
ksh -c "echo 'ksh is executed'"

# Execute a specific script:
ksh path/to/script.ksh

# Check a specific script for syntax errors without executing it:
ksh -n path/to/script.ksh

# Execute a specific script, printing each command in the script before executing it:
ksh -x path/to/script.ksh

$
Follow @igor_chubin cheat.sh tldr