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How to delete all empty lines in SED?
How do I delete all empty lines with sed under Linux or Unix-like systems? sed is a stream editor and perfect for this kind of work. You need to use d command under sed which act as the delete function. Sed Delete Empty Line Syntax. The syntax is as follows to delete empty lines using sed: sed ‘/^$/d’ echo “LINE” | sed ‘/^$/d’
How to delete empty lines in Linux file?
Conclusion. In short, use any one of the following sed syntax to remove all empty lines from a text file under Linux, macOS, *BSD and Unix-like systems: sed ‘/^ [ [:space:]]*$/d’ input > output. sed ‘/^\\s*$/d’ in > out. sed ‘/^$/d’ input > output. sed -n ‘/^\\s*$/!p’ in.txt > out.txt. See more sed examples from our page:
Can you start two SED processes in a pipeline?
If you’re worried about starting two sed processes in a pipeline for performance reasons, you probably shouldn’t be, it’s still very efficient. But based on your comment that you want to do in-place editing, you can still do that with distinct commands ( sed commands rather than invocations of sed itself).
Can a sed command be used as a semicolon?
But based on your comment that you want to do in-place editing, you can still do that with distinct commands ( sed commands rather than invocations of sed itself). You can either use multiple -e arguments or separate commands with a semicolon, something like (just one of these, not both):
How to delete lines that start with specified character?
Delete lines that begin with specified character ^ is to specify the starting of the line. Above sed command removes all the lines that start with character ‘u’. 11. Delete lines that end with specified character $ is to indicate the end of the line. The above command deletes all the lines that end with character ‘x’. 12.
How to remove blank lines from file in shell?
1 For awk, see: Remove blank lines in awk, or using grep, in general, see: How to remove blank lines from a file in shell?– kenorbMay 5 ’15 at 16:07 Add a comment | 15 Answers 15