There is one more flag that wasn't covered that is used with substitution command, the
w. This is used to write the outputs to a file.
# sed script /all/w all.txt /One/w one.txt /the/w the.txt ... # Up to ten output files in one script
Within each instance of sed, you can include up to ten output files. Note the single space between the
w flag and the output file name.
You can output a list of files depending on the last digit.
$ sed -n '1w output.txt'
$ sed -n -e '1w output.txt' -e '$w output.txt' oneOS.txt
$ sed -n '/pattern/w output.txt' oneOS.txt
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