How do I delete a sed matching line?

To begin with, if you want to delete a line containing the keyword, you would run sed as shown below. Similarly, you could run the sed command with option -n and negated p , (! p) command. To delete lines containing multiple keywords, for example to delete lines with the keyword green or lines with keyword violet.

How do I remove blank lines from a text file in Linux?

Simple solution is by using grep (GNU or BSD) command as below.

1. Remove blank lines (not including lines with spaces). grep . file.txt.
2. Remove completely blank lines (including lines with spaces). grep “\S” file.txt.

How do you use a new line character in sed?

Fast answer

1. :a create a label ‘a’
2. N append the next line to the pattern space.
3. $! if not the last line, ba branch (go to) label ‘a’
4. s substitute, /\n/ regex for new line, / / by a space, /g global match (as many times as it can)

What is new line in SED?

By default, every line ends with \n when creating a file. The `sed` command can easily split on \n and replace the newline with any character. Another delimiter can be used in place of \n, but only when GNU sed is used. When the \n is missing in the last line of the file, GNU sed can avoid printing \n.

How do I get rid of the new line character in a text file?

You can remove the newline character at the end of file using following easy way:

1. head -c -1 file. From man head : -c, –bytes=[-]K print the first K bytes of each file; with the leading ‘-‘, print all but the last K bytes of each file.
2. truncate -s -1 file.

How do you delete new line in bash?

4 Answers. If you are using bash , you can use Parameter Expansion: dt=${dt//$’\n’/} # Remove all newlines. dt=${dt\%$’\n’} # Remove a trailing newline.

How do you remove blank lines in Java?

Try this: String text = “line 1\n\nline 3\n\n\nline 5”; String adjusted = text. replaceAll(“(? m)^[ \t]*\r?\