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\typeout{msg}
Prints msg on the terminal and in the log file. Commands in msg
that are defined with \newcommand or \renewcommand are replaced by
their definitions before being printed.
LaTeX's usual rules for treating multiple spaces as a single space and
ignoring spaces after a command name apply to msg. A \space command
in msg causes a single space to be printed. A ^^J in msg prints a
newline.
\typein[cmd]{msg}
Prints msg on the terminal and causes LaTeX to stop and wait for you
to type a line of input, ending with return. If the cmd argument is
missing, the typed input is processed as if it had been included in the
input file in place of the \typein command. If the cmd argument is
present, it must be a command name. This command name is then defined
or redefined to be the typed input.
or redefined to be the typed input.