Output Summary (The GNU Awk User’s Guide)

The print statement prints comma-separated expressions. Each expression is separated by the value of OFS and terminated by the value of ORS. OFMT provides the conversion format for numeric values for the print statement.
The printf statement provides finer-grained control over output, with format-control letters for different data types and various flags that modify the behavior of the format-control letters.
Output from both print and printf may be redirected to files, pipes, and coprocesses.
gawk provides special file names for access to standard input, output, and error, and for network communications.
Use close() to close open file, pipe, and coprocess redirections. For coprocesses, it is possible to close only one direction of the communications.
Normally errors with print or printf are fatal. gawk lets you make output errors be nonfatal either for all files or on a per-file basis. You must then check for errors after every relevant output statement.