How to remove empty/blank lines in a file in Unix? The Next CEO of Stack OverflowUseful...
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How to remove empty/blank lines in a file in Unix?
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How do I remove empty/blank (including spaces only) lines in a file in Unix/Linux using the command line?
contents of file.txt
Line:Text
1:<blank>
2:AAA
3:<blank>
4:BBB
5:<blank>
6:<space><space><space>CCC
7:<space><space>
8:DDD
output desired
1:AAA
2:BBB
3:<space><space><space>CCC
4:DDD
linux unix command-line-interface text parsing
edited May 5 '15 at 17:04
kenorb
3,1733042
asked Mar 28 '11 at 22:14
Michael Ellick AngMichael Ellick Ang
5242514
add a comment |
How do I remove empty/blank (including spaces only) lines in a file in Unix/Linux using the command line?
contents of file.txt
Line:Text
1:<blank>
2:AAA
3:<blank>
4:BBB
5:<blank>
6:<space><space><space>CCC
7:<space><space>
8:DDD
output desired
1:AAA
2:BBB
3:<space><space><space>CCC
4:DDD
linux unix command-line-interface text parsing
edited May 5 '15 at 17:04
kenorb
3,1733042
asked Mar 28 '11 at 22:14
Michael Ellick AngMichael Ellick Ang
5242514
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?
– kenorb
May 5 '15 at 16:11
same question and same answer given over here but with much more votes
– Trevor Boyd Smith
Feb 21 '18 at 19:18
add a comment |
How do I remove empty/blank (including spaces only) lines in a file in Unix/Linux using the command line?
contents of file.txt
Line:Text
1:<blank>
2:AAA
3:<blank>
4:BBB
5:<blank>
6:<space><space><space>CCC
7:<space><space>
8:DDD
output desired
1:AAA
2:BBB
3:<space><space><space>CCC
4:DDD
linux unix command-line-interface text parsing
edited May 5 '15 at 17:04
kenorb
3,1733042
asked Mar 28 '11 at 22:14
Michael Ellick AngMichael Ellick Ang
5242514
How do I remove empty/blank (including spaces only) lines in a file in Unix/Linux using the command line?
contents of file.txt
Line:Text
1:<blank>
2:AAA
3:<blank>
4:BBB
5:<blank>
6:<space><space><space>CCC
7:<space><space>
8:DDD
output desired
1:AAA
2:BBB
3:<space><space><space>CCC
4:DDD
linux unix command-line-interface text parsing
linux unix command-line-interface text parsing
edited May 5 '15 at 17:04
kenorb
3,1733042
asked Mar 28 '11 at 22:14
Michael Ellick AngMichael Ellick Ang
5242514
edited May 5 '15 at 17:04
kenorb
3,1733042
asked Mar 28 '11 at 22:14
Michael Ellick AngMichael Ellick Ang
5242514
edited May 5 '15 at 17:04
kenorb
3,1733042
edited May 5 '15 at 17:04
kenorb
3,1733042
edited May 5 '15 at 17:04
kenorb
3,1733042
3,1733042
asked Mar 28 '11 at 22:14
Michael Ellick AngMichael Ellick Ang
5242514
asked Mar 28 '11 at 22:14
Michael Ellick AngMichael Ellick Ang
5242514
asked Mar 28 '11 at 22:14
Michael Ellick AngMichael Ellick Ang
5242514
5242514
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?
– kenorb
May 5 '15 at 16:11
same question and same answer given over here but with much more votes
– Trevor Boyd Smith
Feb 21 '18 at 19:18
add a comment |
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?
– kenorb
May 5 '15 at 16:11
same question and same answer given over here but with much more votes
– Trevor Boyd Smith
Feb 21 '18 at 19:18
1
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?
– kenorb
May 5 '15 at 16:11
For awk, see: Remove blank lines in awk, or using grep, in general, see: How to remove blank lines from a file in shell?
– kenorb
May 5 '15 at 16:11
same question and same answer given over here but with much more votes
– Trevor Boyd Smith
Feb 21 '18 at 19:18
same question and same answer given over here but with much more votes
– Trevor Boyd Smith
Feb 21 '18 at 19:18
add a comment |
7 Answers
7
active
oldest
votes
This sed line should do the trick:
sed -i '/^$/d' file.txt
The -i means it will edit the file in-place.
edited 12 mins ago
Eddie C.
395211
answered Mar 28 '11 at 22:19
Martijn HeemelsMartijn Heemels
5,89152757
9
It actually needs to be "/^ *$/d" to remove lines that only contain spaces.
– Sean Reifschneider
Mar 28 '11 at 23:36
1
@SeanReifschneider That requirement was not in the question when this answer was written?
– kasperd
Apr 18 '16 at 10:02
3
@SeanReifschneider Would "/^s*$/d" not be better as it would include tabs? Whilst it's not mentioned in the original post, it seems a stronger option to me.
– mrswadge
Sep 20 '17 at 12:57
adding thes*is the same solution given by stackoverflow question
– Trevor Boyd Smith
Feb 21 '18 at 19:17
add a comment |
sed '/^$/d' file.txt
d is the sed command to delete a line. ^$ is a regular expression matching only a blank line, a line start followed by a line end.
answered Mar 28 '11 at 22:18
Kamil KisielKamil Kisiel
10k73765
+1 for the explanation
– Alex Raj Kaliamoorthy
Feb 17 '18 at 10:26
add a comment |
Simple solution by using grep (GNU or BSD) command:
grep . file
Similar with ripgrep (suitable for much larger files):
rg -N . file
answered May 5 '15 at 16:12
kenorbkenorb
3,1733042
2
grep .seems to be the simplest solution.
– Leo
Mar 21 '18 at 21:36
add a comment |
You can use the -v option with grep to remove the matching empty lines.
Like this
grep -Ev "^$" file.txt
answered Mar 28 '11 at 22:20
jdabneyjdabney
1813
3
I don't believe you need the-E, at least not with GNU grep, but apart from that I'm so pleased to see this done with grep! It's what I reach for in preference to sed, every time; in-line filters seem to me to be better than in-line editors.
– MadHatter
Mar 28 '11 at 22:45
If you want to skip the commented and blank lines, especially while dealing with conf files usegrep -Ev '^#|^$' file.txt
– Govind Kailas
Mar 7 at 4:11
add a comment |
To remove empty lines, you could squeeze new line repeats with tr:
cat file.txt | tr -s 'n' 'n'
answered Jul 26 '17 at 10:35
siddhadevsiddhadev
16111
add a comment |
Here is an awk solution:
awk NF file
With Awk, NF only set on non-blank lines. When this condition match, Awk default action is to print the whole line.
answered Jun 8 '18 at 16:48
Steven PennySteven Penny
1
add a comment |
Ex/Vim
Here is the method using ex editor (part of Vim):
ex -s +'v/S/d' -cwq test.txt
For multiple files (edit in-place):
ex -s +'bufdo!v/S/d' -cxa *.txt
Note: The :bufdo command is not POSIX.
Without modifying the file (just print on the standard output):
cat test.txt | ex -s +'v/S/d' +%p +q! /dev/stdin
answered Apr 12 '18 at 21:24
kenorbkenorb
3,1733042
add a comment |
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7 Answers
7
active
oldest
votes
7 Answers
7
active
oldest
votes
active
oldest
votes
active
oldest
votes
This sed line should do the trick:
sed -i '/^$/d' file.txt
The -i means it will edit the file in-place.
edited 12 mins ago
Eddie C.
395211
answered Mar 28 '11 at 22:19
Martijn HeemelsMartijn Heemels
5,89152757
9
It actually needs to be "/^ *$/d" to remove lines that only contain spaces.
– Sean Reifschneider
Mar 28 '11 at 23:36
1
@SeanReifschneider That requirement was not in the question when this answer was written?
– kasperd
Apr 18 '16 at 10:02
3
@SeanReifschneider Would "/^s*$/d" not be better as it would include tabs? Whilst it's not mentioned in the original post, it seems a stronger option to me.
– mrswadge
Sep 20 '17 at 12:57
adding thes*is the same solution given by stackoverflow question
– Trevor Boyd Smith
Feb 21 '18 at 19:17
add a comment |
This sed line should do the trick:
sed -i '/^$/d' file.txt
The -i means it will edit the file in-place.
edited 12 mins ago
Eddie C.
395211
answered Mar 28 '11 at 22:19
Martijn HeemelsMartijn Heemels
5,89152757
9
It actually needs to be "/^ *$/d" to remove lines that only contain spaces.
– Sean Reifschneider
Mar 28 '11 at 23:36
1
@SeanReifschneider That requirement was not in the question when this answer was written?
– kasperd
Apr 18 '16 at 10:02
3
@SeanReifschneider Would "/^s*$/d" not be better as it would include tabs? Whilst it's not mentioned in the original post, it seems a stronger option to me.
– mrswadge
Sep 20 '17 at 12:57
adding thes*is the same solution given by stackoverflow question
– Trevor Boyd Smith
Feb 21 '18 at 19:17
add a comment |
This sed line should do the trick:
sed -i '/^$/d' file.txt
The -i means it will edit the file in-place.
edited 12 mins ago
Eddie C.
395211
answered Mar 28 '11 at 22:19
Martijn HeemelsMartijn Heemels
5,89152757
This sed line should do the trick:
sed -i '/^$/d' file.txt
The -i means it will edit the file in-place.
edited 12 mins ago
Eddie C.
395211
answered Mar 28 '11 at 22:19
Martijn HeemelsMartijn Heemels
5,89152757
edited 12 mins ago
Eddie C.
395211
edited 12 mins ago
Eddie C.
395211
edited 12 mins ago
Eddie C.
395211
395211
answered Mar 28 '11 at 22:19
Martijn HeemelsMartijn Heemels
5,89152757
answered Mar 28 '11 at 22:19
Martijn HeemelsMartijn Heemels
5,89152757
answered Mar 28 '11 at 22:19
Martijn HeemelsMartijn Heemels
5,89152757
5,89152757
9
It actually needs to be "/^ *$/d" to remove lines that only contain spaces.
– Sean Reifschneider
Mar 28 '11 at 23:36
1
@SeanReifschneider That requirement was not in the question when this answer was written?
– kasperd
Apr 18 '16 at 10:02
3
@SeanReifschneider Would "/^s*$/d" not be better as it would include tabs? Whilst it's not mentioned in the original post, it seems a stronger option to me.
– mrswadge
Sep 20 '17 at 12:57
adding thes*is the same solution given by stackoverflow question
– Trevor Boyd Smith
Feb 21 '18 at 19:17
add a comment |
9
It actually needs to be "/^ *$/d" to remove lines that only contain spaces.
– Sean Reifschneider
Mar 28 '11 at 23:36
1
@SeanReifschneider That requirement was not in the question when this answer was written?
– kasperd
Apr 18 '16 at 10:02
3
@SeanReifschneider Would "/^s*$/d" not be better as it would include tabs? Whilst it's not mentioned in the original post, it seems a stronger option to me.
– mrswadge
Sep 20 '17 at 12:57
adding thes*is the same solution given by stackoverflow question
– Trevor Boyd Smith
Feb 21 '18 at 19:17
9
9
It actually needs to be "/^ *$/d" to remove lines that only contain spaces.
– Sean Reifschneider
Mar 28 '11 at 23:36
It actually needs to be "/^ *$/d" to remove lines that only contain spaces.
– Sean Reifschneider
Mar 28 '11 at 23:36
1
1
@SeanReifschneider That requirement was not in the question when this answer was written?
– kasperd
Apr 18 '16 at 10:02
@SeanReifschneider That requirement was not in the question when this answer was written?
– kasperd
Apr 18 '16 at 10:02
3
3
@SeanReifschneider Would "/^s*$/d" not be better as it would include tabs? Whilst it's not mentioned in the original post, it seems a stronger option to me.
– mrswadge
Sep 20 '17 at 12:57
@SeanReifschneider Would "/^s*$/d" not be better as it would include tabs? Whilst it's not mentioned in the original post, it seems a stronger option to me.
– mrswadge
Sep 20 '17 at 12:57
adding the
s* is the same solution given by stackoverflow question– Trevor Boyd Smith
Feb 21 '18 at 19:17
adding the
s* is the same solution given by stackoverflow question– Trevor Boyd Smith
Feb 21 '18 at 19:17
add a comment |
sed '/^$/d' file.txt
d is the sed command to delete a line. ^$ is a regular expression matching only a blank line, a line start followed by a line end.
answered Mar 28 '11 at 22:18
Kamil KisielKamil Kisiel
10k73765
+1 for the explanation
– Alex Raj Kaliamoorthy
Feb 17 '18 at 10:26
add a comment |
sed '/^$/d' file.txt
d is the sed command to delete a line. ^$ is a regular expression matching only a blank line, a line start followed by a line end.
answered Mar 28 '11 at 22:18
Kamil KisielKamil Kisiel
10k73765
+1 for the explanation
– Alex Raj Kaliamoorthy
Feb 17 '18 at 10:26
add a comment |
sed '/^$/d' file.txt
d is the sed command to delete a line. ^$ is a regular expression matching only a blank line, a line start followed by a line end.
answered Mar 28 '11 at 22:18
Kamil KisielKamil Kisiel
10k73765
sed '/^$/d' file.txt
d is the sed command to delete a line. ^$ is a regular expression matching only a blank line, a line start followed by a line end.
answered Mar 28 '11 at 22:18
Kamil KisielKamil Kisiel
10k73765
answered Mar 28 '11 at 22:18
Kamil KisielKamil Kisiel
10k73765
answered Mar 28 '11 at 22:18
Kamil KisielKamil Kisiel
10k73765
answered Mar 28 '11 at 22:18
Kamil KisielKamil Kisiel
10k73765
10k73765
+1 for the explanation
– Alex Raj Kaliamoorthy
Feb 17 '18 at 10:26
add a comment |
+1 for the explanation
– Alex Raj Kaliamoorthy
Feb 17 '18 at 10:26
+1 for the explanation
– Alex Raj Kaliamoorthy
Feb 17 '18 at 10:26
+1 for the explanation
– Alex Raj Kaliamoorthy
Feb 17 '18 at 10:26
add a comment |
Simple solution by using grep (GNU or BSD) command:
grep . file
Similar with ripgrep (suitable for much larger files):
rg -N . file
answered May 5 '15 at 16:12
kenorbkenorb
3,1733042
2
grep .seems to be the simplest solution.
– Leo
Mar 21 '18 at 21:36
add a comment |
Simple solution by using grep (GNU or BSD) command:
grep . file
Similar with ripgrep (suitable for much larger files):
rg -N . file
answered May 5 '15 at 16:12
kenorbkenorb
3,1733042
2
grep .seems to be the simplest solution.
– Leo
Mar 21 '18 at 21:36
add a comment |
Simple solution by using grep (GNU or BSD) command:
grep . file
Similar with ripgrep (suitable for much larger files):
rg -N . file
answered May 5 '15 at 16:12
kenorbkenorb
3,1733042
Simple solution by using grep (GNU or BSD) command:
grep . file
Similar with ripgrep (suitable for much larger files):
rg -N . file
answered May 5 '15 at 16:12
kenorbkenorb
3,1733042
edited Jan 18 at 14:36
answered May 5 '15 at 16:12
kenorbkenorb
3,1733042
answered May 5 '15 at 16:12
kenorbkenorb
3,1733042
answered May 5 '15 at 16:12
kenorbkenorb
3,1733042
3,1733042
2
grep .seems to be the simplest solution.
– Leo
Mar 21 '18 at 21:36
add a comment |
2
grep .seems to be the simplest solution.
– Leo
Mar 21 '18 at 21:36
2
2
grep . seems to be the simplest solution.– Leo
Mar 21 '18 at 21:36
grep . seems to be the simplest solution.– Leo
Mar 21 '18 at 21:36
add a comment |
You can use the -v option with grep to remove the matching empty lines.
Like this
grep -Ev "^$" file.txt
answered Mar 28 '11 at 22:20
jdabneyjdabney
1813
3
I don't believe you need the-E, at least not with GNU grep, but apart from that I'm so pleased to see this done with grep! It's what I reach for in preference to sed, every time; in-line filters seem to me to be better than in-line editors.
– MadHatter
Mar 28 '11 at 22:45
If you want to skip the commented and blank lines, especially while dealing with conf files usegrep -Ev '^#|^$' file.txt
– Govind Kailas
Mar 7 at 4:11
add a comment |
You can use the -v option with grep to remove the matching empty lines.
Like this
grep -Ev "^$" file.txt
answered Mar 28 '11 at 22:20
jdabneyjdabney
1813
3
I don't believe you need the-E, at least not with GNU grep, but apart from that I'm so pleased to see this done with grep! It's what I reach for in preference to sed, every time; in-line filters seem to me to be better than in-line editors.
– MadHatter
Mar 28 '11 at 22:45
If you want to skip the commented and blank lines, especially while dealing with conf files usegrep -Ev '^#|^$' file.txt
– Govind Kailas
Mar 7 at 4:11
add a comment |
You can use the -v option with grep to remove the matching empty lines.
Like this
grep -Ev "^$" file.txt
answered Mar 28 '11 at 22:20
jdabneyjdabney
1813
You can use the -v option with grep to remove the matching empty lines.
Like this
grep -Ev "^$" file.txt
answered Mar 28 '11 at 22:20
jdabneyjdabney
1813
answered Mar 28 '11 at 22:20
jdabneyjdabney
1813
answered Mar 28 '11 at 22:20
jdabneyjdabney
1813
answered Mar 28 '11 at 22:20
jdabneyjdabney
1813
1813
3
I don't believe you need the-E, at least not with GNU grep, but apart from that I'm so pleased to see this done with grep! It's what I reach for in preference to sed, every time; in-line filters seem to me to be better than in-line editors.
– MadHatter
Mar 28 '11 at 22:45
If you want to skip the commented and blank lines, especially while dealing with conf files usegrep -Ev '^#|^$' file.txt
– Govind Kailas
Mar 7 at 4:11
add a comment |
3
I don't believe you need the-E, at least not with GNU grep, but apart from that I'm so pleased to see this done with grep! It's what I reach for in preference to sed, every time; in-line filters seem to me to be better than in-line editors.
– MadHatter
Mar 28 '11 at 22:45
If you want to skip the commented and blank lines, especially while dealing with conf files usegrep -Ev '^#|^$' file.txt
– Govind Kailas
Mar 7 at 4:11
3
3
I don't believe you need the
-E, at least not with GNU grep, but apart from that I'm so pleased to see this done with grep! It's what I reach for in preference to sed, every time; in-line filters seem to me to be better than in-line editors.– MadHatter
Mar 28 '11 at 22:45
I don't believe you need the
-E, at least not with GNU grep, but apart from that I'm so pleased to see this done with grep! It's what I reach for in preference to sed, every time; in-line filters seem to me to be better than in-line editors.– MadHatter
Mar 28 '11 at 22:45
If you want to skip the commented and blank lines, especially while dealing with conf files use
grep -Ev '^#|^$' file.txt– Govind Kailas
Mar 7 at 4:11
If you want to skip the commented and blank lines, especially while dealing with conf files use
grep -Ev '^#|^$' file.txt– Govind Kailas
Mar 7 at 4:11
add a comment |
To remove empty lines, you could squeeze new line repeats with tr:
cat file.txt | tr -s 'n' 'n'
answered Jul 26 '17 at 10:35
siddhadevsiddhadev
16111
add a comment |
To remove empty lines, you could squeeze new line repeats with tr:
cat file.txt | tr -s 'n' 'n'
answered Jul 26 '17 at 10:35
siddhadevsiddhadev
16111
add a comment |
To remove empty lines, you could squeeze new line repeats with tr:
cat file.txt | tr -s 'n' 'n'
answered Jul 26 '17 at 10:35
siddhadevsiddhadev
16111
To remove empty lines, you could squeeze new line repeats with tr:
cat file.txt | tr -s 'n' 'n'
answered Jul 26 '17 at 10:35
siddhadevsiddhadev
16111
answered Jul 26 '17 at 10:35
siddhadevsiddhadev
16111
answered Jul 26 '17 at 10:35
siddhadevsiddhadev
16111
answered Jul 26 '17 at 10:35
siddhadevsiddhadev
16111
16111
add a comment |
add a comment |
Here is an awk solution:
awk NF file
With Awk, NF only set on non-blank lines. When this condition match, Awk default action is to print the whole line.
answered Jun 8 '18 at 16:48
Steven PennySteven Penny
1
add a comment |
Here is an awk solution:
awk NF file
With Awk, NF only set on non-blank lines. When this condition match, Awk default action is to print the whole line.
answered Jun 8 '18 at 16:48
Steven PennySteven Penny
1
add a comment |
Here is an awk solution:
awk NF file
With Awk, NF only set on non-blank lines. When this condition match, Awk default action is to print the whole line.
answered Jun 8 '18 at 16:48
Steven PennySteven Penny
1
Here is an awk solution:
awk NF file
With Awk, NF only set on non-blank lines. When this condition match, Awk default action is to print the whole line.
answered Jun 8 '18 at 16:48
Steven PennySteven Penny
1
answered Jun 8 '18 at 16:48
Steven PennySteven Penny
1
answered Jun 8 '18 at 16:48
Steven PennySteven Penny
1
answered Jun 8 '18 at 16:48
Steven PennySteven Penny
1
1
add a comment |
add a comment |
Ex/Vim
Here is the method using ex editor (part of Vim):
ex -s +'v/S/d' -cwq test.txt
For multiple files (edit in-place):
ex -s +'bufdo!v/S/d' -cxa *.txt
Note: The :bufdo command is not POSIX.
Without modifying the file (just print on the standard output):
cat test.txt | ex -s +'v/S/d' +%p +q! /dev/stdin
answered Apr 12 '18 at 21:24
kenorbkenorb
3,1733042
add a comment |
Ex/Vim
Here is the method using ex editor (part of Vim):
ex -s +'v/S/d' -cwq test.txt
For multiple files (edit in-place):
ex -s +'bufdo!v/S/d' -cxa *.txt
Note: The :bufdo command is not POSIX.
Without modifying the file (just print on the standard output):
cat test.txt | ex -s +'v/S/d' +%p +q! /dev/stdin
answered Apr 12 '18 at 21:24
kenorbkenorb
3,1733042
add a comment |
Ex/Vim
Here is the method using ex editor (part of Vim):
ex -s +'v/S/d' -cwq test.txt
For multiple files (edit in-place):
ex -s +'bufdo!v/S/d' -cxa *.txt
Note: The :bufdo command is not POSIX.
Without modifying the file (just print on the standard output):
cat test.txt | ex -s +'v/S/d' +%p +q! /dev/stdin
answered Apr 12 '18 at 21:24
kenorbkenorb
3,1733042
Ex/Vim
Here is the method using ex editor (part of Vim):
ex -s +'v/S/d' -cwq test.txt
For multiple files (edit in-place):
ex -s +'bufdo!v/S/d' -cxa *.txt
Note: The :bufdo command is not POSIX.
Without modifying the file (just print on the standard output):
cat test.txt | ex -s +'v/S/d' +%p +q! /dev/stdin
answered Apr 12 '18 at 21:24
kenorbkenorb
3,1733042
answered Apr 12 '18 at 21:24
kenorbkenorb
3,1733042
answered Apr 12 '18 at 21:24
kenorbkenorb
3,1733042
answered Apr 12 '18 at 21:24
kenorbkenorb
3,1733042
3,1733042
add a comment |
add a comment |
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For awk, see: Remove blank lines in awk, or using grep, in general, see: How to remove blank lines from a file in shell?
– kenorb
May 5 '15 at 16:11
same question and same answer given over here but with much more votes
– Trevor Boyd Smith
Feb 21 '18 at 19:18