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This article is part of Unix Sed Tutorial series. In previous articles, we discussed about sed print operation , sed delete operation and sed find and replace.
In this article, let us review how to extract part of one file and write it to another file using sed.
Sed provides “w” command to write the pattern space data to a new file.
Sed creates or truncates the given filename before reads the first input line and it writes all the matches to a file without closing and re-opening the file.
Sed reads a line and place it in a pattern buffer and writes the pattern buffer to the given output file according to the supplied commands.
Let us first create thegeekstuff.txt file that will be used in all the examples mentioned below.
Let us review some examples of write command in sed.
1. Write 1st line of the file
In this example, 1 (address) refers the first line of the input and w writes the pattern buffer to the output file “output.txt”
2. Write first & last line of the file
In this example, 1 and $ refers first and last line respectively.
3. Write the lines matches with the pattern Storage or Sysadmin
In this example sed command writes the lines which matches the pattern “Storage” or “Sysadmin”.
4. Write the lines from which the pattern matches to till end of the file
In this example, /Storage/,$ represents line matches from Storage to end of the file.
5. Write the lines which matches pattern and next two lines from match
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In this example, the send command writes the line matches for “Storage” and two lines next to that.