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I would like sed to remove empty lines from a file. I used this command:

cat file | sed '; ^$ ; d'

and was given the following error:

 sed: -e expression #1, char 3: unknown command: `^'

Why is this happening? Isn't sed supposed to interpret ^ as "the beginning of the line"? If so, why am I getting this error message?

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    You didn't give sed a command, like 's' for search & replace – Jeff Schaller Jan 6 '17 at 0:45
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The (more) correct way is

cat file | sed '/^$/d'

But I am sure people will have lots of answers to the way of deleting empty lines.

  • What about this command makes it "more correct"? – lowtex Jan 6 '17 at 0:57
  • It works? At least for me ;-) – ojs Jan 6 '17 at 0:59
  • When you use semicolons then you are telling sed that there are multiple commands to execute, so sed is expecting a seperate command, like d, inbetween each semicolon. – ojs Jan 6 '17 at 1:02

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