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into - copy into a file without destroying it
into [ -f ] outfile
Into copies its standard input into the specified outfile, but
doesn't actually modify the file until it gets EOF. This is useful in a pipeline
for putting stuff back in the "same place." The outfile is not overwritten
if that would make it zero length, unless the -f option is given. That option
also forces overwriting of the outfile even if it is not directly writable
(as long as the directory is writable).
pipe(2)
For efficiency
reasons, the directory containing the outfile must be writable by the invoker.
The original outfile's owner is not preserved.
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