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How do I delete all blank lines in a buffer?

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4

1

Emacs 26.1

In buffer

1


2


3


4

I use command "delete-blank-lines". But it NOT delete ALL BLANK LINES. It's delete ONLY ONE BLANK LINE.

Why?

I need to delete ALL BLANK LINES.
The result must be like this:

1
2
3
4

text-editing

share|improve this question

edited 1 hour ago

Tyler

12.2k12354

asked 3 hours ago

AlexeiAlexei

759212

• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  
  Are you saying you used delete-blank-lines once? If you look at the help for the function, it will tell you it deletes the surrounding blank lines, that is the blank lines around point, not all blank lines in the buffer.
  
  – Willy Lee
  2 hours ago
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  What @WillyLee said.
  
  – Drew
  1 min ago
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Possible duplicate of how do I quickly remove lines from emacs buffer
  
  – Drew
  15 secs ago
  

  
  
  
  

add a comment | 

4

1

Emacs 26.1

In buffer

1


2


3


4

I use command "delete-blank-lines". But it NOT delete ALL BLANK LINES. It's delete ONLY ONE BLANK LINE.

Why?

I need to delete ALL BLANK LINES.
The result must be like this:

1
2
3
4

text-editing

share|improve this question

edited 1 hour ago

Tyler

12.2k12354

asked 3 hours ago

AlexeiAlexei

759212

• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  
  Are you saying you used delete-blank-lines once? If you look at the help for the function, it will tell you it deletes the surrounding blank lines, that is the blank lines around point, not all blank lines in the buffer.
  
  – Willy Lee
  2 hours ago
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  What @WillyLee said.
  
  – Drew
  1 min ago
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Possible duplicate of how do I quickly remove lines from emacs buffer
  
  – Drew
  15 secs ago
  

  
  
  
  

add a comment | 

Emacs 26.1

In buffer

1


2


3


4

I use command "delete-blank-lines". But it NOT delete ALL BLANK LINES. It's delete ONLY ONE BLANK LINE.

Why?

I need to delete ALL BLANK LINES.
The result must be like this:

1
2
3
4

text-editing

share|improve this question

edited 1 hour ago

Tyler

12.2k12354

asked 3 hours ago

AlexeiAlexei

759212

1


2


3


4

1
2
3
4

share|improve this question

edited 1 hour ago

Tyler

12.2k12354

asked 3 hours ago

AlexeiAlexei

759212

share|improve this question

edited 1 hour ago

Tyler

12.2k12354

asked 3 hours ago

AlexeiAlexei

759212

edited 1 hour ago

Tyler

12.2k12354

edited 1 hour ago

Tyler

12.2k12354

asked 3 hours ago

AlexeiAlexei

759212

asked 3 hours ago

AlexeiAlexei

759212

1 Answer
1

active

oldest

votes

5

From MasteringEmacs.com By Mickey Petersen:

This is a frequent question so I figured I’d mention the solution here:

You want to remove all empty (blank) lines from a buffer. How do you do it? Well, it’s super easy.

Mark what you want to change (or use C-x h to mark the whole buffer) and run this:

M-x flush-lines RET ^$ RET

And you’re done. So what does that mean? Well, M-x flush-lines will flush (remove) lines that match a regular expression, and ^$ contain the meta-characters ^ for beginning of string and $ for end of string. Ergo, if the two meta-characters are next to eachother, it must be a blank line.

We can also generalize it further and remove lines that may have whitespace (only!) characters:

M-x flush-lines RET ^s-*$ RET

In this case s- is the syntax class (type C-h s to see your buffer’s syntax table) for whitespace characters. The * meta-character, in case you are not a regexp person, means zero or more of the preceding character.

share|improve this answer

answered 1 hour ago

manandearthmanandearth

1,1851419

add a comment | 

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5

From MasteringEmacs.com By Mickey Petersen:

This is a frequent question so I figured I’d mention the solution here:

You want to remove all empty (blank) lines from a buffer. How do you do it? Well, it’s super easy.

Mark what you want to change (or use C-x h to mark the whole buffer) and run this:

M-x flush-lines RET ^$ RET

And you’re done. So what does that mean? Well, M-x flush-lines will flush (remove) lines that match a regular expression, and ^$ contain the meta-characters ^ for beginning of string and $ for end of string. Ergo, if the two meta-characters are next to eachother, it must be a blank line.

We can also generalize it further and remove lines that may have whitespace (only!) characters:

M-x flush-lines RET ^s-*$ RET

In this case s- is the syntax class (type C-h s to see your buffer’s syntax table) for whitespace characters. The * meta-character, in case you are not a regexp person, means zero or more of the preceding character.

share|improve this answer

answered 1 hour ago

manandearthmanandearth

1,1851419

add a comment | 

5

From MasteringEmacs.com By Mickey Petersen:

This is a frequent question so I figured I’d mention the solution here:

You want to remove all empty (blank) lines from a buffer. How do you do it? Well, it’s super easy.

Mark what you want to change (or use C-x h to mark the whole buffer) and run this:

M-x flush-lines RET ^$ RET

And you’re done. So what does that mean? Well, M-x flush-lines will flush (remove) lines that match a regular expression, and ^$ contain the meta-characters ^ for beginning of string and $ for end of string. Ergo, if the two meta-characters are next to eachother, it must be a blank line.

We can also generalize it further and remove lines that may have whitespace (only!) characters:

M-x flush-lines RET ^s-*$ RET

In this case s- is the syntax class (type C-h s to see your buffer’s syntax table) for whitespace characters. The * meta-character, in case you are not a regexp person, means zero or more of the preceding character.

share|improve this answer

answered 1 hour ago

manandearthmanandearth

1,1851419

add a comment | 

From MasteringEmacs.com By Mickey Petersen:

This is a frequent question so I figured I’d mention the solution here:

You want to remove all empty (blank) lines from a buffer. How do you do it? Well, it’s super easy.

Mark what you want to change (or use C-x h to mark the whole buffer) and run this:

M-x flush-lines RET ^$ RET

And you’re done. So what does that mean? Well, M-x flush-lines will flush (remove) lines that match a regular expression, and ^$ contain the meta-characters ^ for beginning of string and $ for end of string. Ergo, if the two meta-characters are next to eachother, it must be a blank line.

We can also generalize it further and remove lines that may have whitespace (only!) characters:

M-x flush-lines RET ^s-*$ RET

In this case s- is the syntax class (type C-h s to see your buffer’s syntax table) for whitespace characters. The * meta-character, in case you are not a regexp person, means zero or more of the preceding character.

share|improve this answer

answered 1 hour ago

manandearthmanandearth

1,1851419

share|improve this answer

answered 1 hour ago

manandearthmanandearth

1,1851419

answered 1 hour ago

manandearthmanandearth

1,1851419

answered 1 hour ago

manandearthmanandearth

1,1851419