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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.
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.
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.
close() to close open file, pipe, and coprocess redirections.
For coprocesses, it is possible to close only one direction of the
communications.