gawk -i inplace ...
By default, each named file on the command line is replaced with a new file of the same name whose contents are the results of running the AWK program. If the user supplies an AWK variable named inplace::suffix in a BEGIN rule or on the command line, then the inplace extension concatenates that suffix onto the original filename and uses the result as a filename for renaming the original.
For backwards compatibility, the variable will also check INPLACE_SUFFIX (in the awk namespace) for the suffix to use if inplace::suffix is not set.
One can disable inplace editing selectively by placing inplace::enable=0 on the command line prior to files that should be processed normally. One can reenable inplace editing by placing inplace::enable=1 prior to files that should be subject to inplace editing.
If the program dies prematurely, as might happen if an unhandled signal is received, a temporary file may be left behind.
gawk -i inplace 'script' files ...
gawk -i inplace -f scriptfile files ...
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