log - print text and log files

yosys> help log

log string

Print the given string to the screen and/or the log file. This is useful for TCL
scripts, because the TCL command "puts" only goes to stdout but not to
logfiles.

-stdout

Print the output to stdout too. This is useful when all Yosys is
executed with a script and the -q (quiet operation) argument to notify
the user.

-stderr

Print the output to stderr too.

-nolog

Don't use the internal log() command. Use either -stdout or -stderr,
otherwise no output will be generated at all.

-n

do not append a newline