There are two ways to run
awk: with an explicit program, or with
one or more program files. Here are templates for both of them; items
enclosed in `[...]' in these templates are optional.
Besides traditional one-letter POSIX-style options,
supports GNU long options.
awk [options] -f progfile [
--] file ... awk [options] [
--] 'program' file ...
It is possible to invoke
awk with an empty program:
$ awk '' datafile1 datafile2
Doing so makes little sense though;
awk will simply exit
silently when given an empty program (d.c.). If `--lint' has
been specified on the command line,
gawk will issue a
warning that the program is empty.
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