# use cat
cat - concatenate and print files (POSIX)

cat [-cu] [-n|r] [file...]
Options:
 -c      Compress, do not display empty lines.
 -u      Unbuffered, for interactive use.
 -n      Print line numbers without restarting.
 -r      Print line numbers restarting count for each file.
 -w      End of line wait of 100ms for each -w given.