How do you remove blank lines in sed?

The d command in sed can be used to delete the empty lines in a file. Here the ^ specifies the start of the line and $ specifies the end of the line. You can redirect the output of above command and write it into a new file.

How do you get rid of blank lines in Python?

Use the list comprehension syntax [line for line in lines if condition] with lines as the previous result and condition as line. strip() != “” to remove any empty lines from lines . Declare an empty string and use a for-loop to iterate over the previous result.

How do you replace blank lines in Unix?

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 I remove blank lines in a text file?

Open TextPad and the file you want to edit. Click Search and then Replace. In the Replace window, in the Find what section, type ^\n (caret, backslash ‘n’) and leave the Replace with section blank, unless you want to replace a blank line with other text. Check the Regular Expression box.

How do I remove the last blank line in Unix?

5 Answers. Try ${/^$/d;} this will only match an empty line if it is the last line of the file. I tried it with sed (GNU sed) 4.2. 2 and got all blank lines deleted not only the empty line if it is the last line of the file.

Which command will delete all the blank lines in the file old txt?

8. Which command will delete all the blank lines in file old. txt? Explanation: None.

What is strip in Python?

strip() is an inbuilt function in Python programming language that returns a copy of the string with both leading and trailing characters removed (based on the string argument passed).

How do you remove lines from a text file in Python?

How to delete a line from a file in Python

1. a_file = open(“sample.txt”, “r”) get list of lines.
2. lines = a_file. readlines()
3. a_file.
4. new_file = open(“sample.txt”, “w”)
5. for line in lines:
6. if line. strip(“\n”) != “line2”: Delete “line2” from new_file.
7. new_file. write(line)
8. new_file.

How do I remove the first blank line in Unix?

remove only the first blank line sed

1. Do you need to use sed? awk ‘a||$0;!$0{a=1}’ – Kevin. May 11 ’13 at 13:56.
2. @Kevin, $0 resolve to false if the line is empty or resolves to a numerical 0 (like 00 or 0.0 or 0e12 …). Use $0 != “” instead.
3. @StephaneChazelas Right, not enough coffee. awk ‘a||NF;!NF{a=1}’ – Kevin.

How do you grep an empty line?

To match empty lines, use the pattern ‘ ^$ ‘. To match blank lines, use the pattern ‘ ^[[:blank:]]*$ ‘. To match no lines at all, use the command ‘ grep -f /dev/null ‘.

How do I delete all empty lines with sed command?

I need to delete all empty lines but could not figure out sed command for the same. 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. You can also match a word or a pattern to delete. For example

How to delete all empty lines from a file in Linux?

A. sed is a stream editor and perfect for these kind of work. You need to use d command under sed which is act as the delete function. sed ‘/^$/d’ . echo LINE | sed ‘/^$/d’. echo $VAR | sed ‘/^$/d’. So to delete all empty lines from a file called /tmp/data.txt, enter:

How to remove blank lines from carriage return in SED?

to remove blank lines whether or not the carriage return is there. Show activity on this post. The command you are trying is correct, just use -E flag with it. -E flag makes sed catch extended regular expressions. More info here Show activity on this post. Show activity on this post. This works in awk as well. Show activity on this post.

How do I remove spaces between newlines and newlines in Python?

The strip () in the last part s.strip (” “).strip () and s.strip () is what actually removes the spaces in newlines and newlines. Technically lines with spaces should NOT be considered empty, but it all depends on the use case and what your trying to achieve.