07. Writing to file(s)

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.


1) Write to first line

$ sed -n '1w output.txt'

2) Write first and last line

$ sed -n -e '1w output.txt' -e '$w output.txt' oneOS.txt

3) Write lines that match a specific pattern

$ sed -n '/pattern/w output.txt' oneOS.txt

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