How to remove blank lines in a file in Linux

1. How do we delete all blank lines in a file in Linux?
2. How will you remove all empty lines in a file using grep?
3. How do I remove blank lines in a text file?
4. How do you delete all blank lines including those that contain whitespace from a file using awk?
5. How do I remove the first blank line in Unix?
6. How do you remove a line in Unix?
7. How do I use grep to search for blank lines in a file?
8. How do I count the number of blank lines in a file in Unix?
9. How do you put a space between lines in shell script?
10. How do I remove the space between lines in notepad?
11. How do I remove blank lines in Editplus?

How do we delete all blank lines in a 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 will you remove all empty lines in a file using grep?

So the command grep -v will print all the lines that do not match this pattern (No characters between ^ and $). This way, empty blank lines are eliminated. Do lines in the file have whitespace characters? \S means match non-blank characters.

How do I remove blank lines in a text file?

Open Notepad++ and the file you want to edit. In the file menu, click Search and then Replace. In the Replace box, in the Find what section, type ^\r\n (five characters: caret, backslash 'r', and backslash 'n'). Leave the Replace with section blank unless you want to replace a blank line with other text.

How do you delete all blank lines including those that contain whitespace from a file using awk?

The output printed by a working solution looks like: This is the first non-blank line. Some data comes here ----- 1 2 3 ----- Data End. This is the last non-blank line.
...
6. Remove Trailing Blank Lines Only

1. 6.1. Using tac. The tac command is a member of the GNU Coreutils package. ...
2. 6.2. Using sed. ...
3. 6.3. Using awk.

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;! $0a=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. Test for NF for non-blank lines. – ...
3. @StephaneChazelas Right, not enough coffee. awk 'a||NF;!

How do you remove a line in Unix?

Deleting a Line

1. Press the Esc key to go to normal mode.
2. Place the cursor on the line you want to delete.
3. Type dd and hit Enter to remove the line.

How do I use grep to search for blank lines in a file?

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 count the number of blank lines in a file in Unix?

I cat file; apply grep with -v (exclude from enumerated) and [^$] (final line, contents “null”). Then I pipe for wc , parameter -l (just count lines). Done.

How do you put a space between lines in shell script?

The G command appends a newline and the hold space to the end of the pattern space. Since, by default, the hold space is empty, this has the effect of just adding an extra newline at the end of each line.

How do I remove the space between lines in notepad?

1. Edit >> Blank Operations >> Trim Leading and Trailing Spaces (to remove black tabs and spaces in empty lines)
2. Ctrl + H to get replace window and replace pattern: ^\r\n with nothing (select regular expression)

How do I remove blank lines in Editplus?

Enter this regular expression in it: ^[ \t]*\n, "regular expression" on the merger, you can delete it. Or directly in the menu "Edit" -> Delete -> Delete blank lines, you can delete all blank lines.