Grep and remove lines with a blank field value

up vote
2
down vote

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I was wondering if there's any command to look for blank field values of a text file and remove the entire line.

Example

 Hello:Its Me
 Hello:How are you
 Hello:
 Hello:Bye

And expected output

 Hello:Its Me
 Hello:How are you
 Hello:Bye

edited Dec 13 '17 at 20:57

terdonâ™¦

122k28230403

asked Dec 13 '17 at 16:05

John Wick

112

3

do add your own efforts to solve to question when asking... your previous question didn't get an answer, but somehow you've got it for this one.. :)
â€“Â Sundeep
Dec 13 '17 at 16:21

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up vote
2
down vote

favorite

I was wondering if there's any command to look for blank field values of a text file and remove the entire line.

Example

 Hello:Its Me
 Hello:How are you
 Hello:
 Hello:Bye

And expected output

 Hello:Its Me
 Hello:How are you
 Hello:Bye

edited Dec 13 '17 at 20:57

terdonâ™¦

122k28230403

asked Dec 13 '17 at 16:05

John Wick

112

3

do add your own efforts to solve to question when asking... your previous question didn't get an answer, but somehow you've got it for this one.. :)
â€“Â Sundeep
Dec 13 '17 at 16:21

add a commentÂ |Â

up vote
2
down vote

favorite

I was wondering if there's any command to look for blank field values of a text file and remove the entire line.

Example

 Hello:Its Me
 Hello:How are you
 Hello:
 Hello:Bye

And expected output

 Hello:Its Me
 Hello:How are you
 Hello:Bye

edited Dec 13 '17 at 20:57

terdonâ™¦

122k28230403

asked Dec 13 '17 at 16:05

John Wick

112

I was wondering if there's any command to look for blank field values of a text file and remove the entire line.

Example

 Hello:Its Me
 Hello:How are you
 Hello:
 Hello:Bye

And expected output

 Hello:Its Me
 Hello:How are you
 Hello:Bye

edited Dec 13 '17 at 20:57

terdonâ™¦

122k28230403

asked Dec 13 '17 at 16:05

John Wick

112

edited Dec 13 '17 at 20:57

terdonâ™¦

122k28230403

edited Dec 13 '17 at 20:57

terdonâ™¦

122k28230403

edited Dec 13 '17 at 20:57

terdonâ™¦

122k28230403

asked Dec 13 '17 at 16:05

John Wick

112

asked Dec 13 '17 at 16:05

John Wick

112

asked Dec 13 '17 at 16:05

John Wick

112

3

do add your own efforts to solve to question when asking... your previous question didn't get an answer, but somehow you've got it for this one.. :)
â€“Â Sundeep
Dec 13 '17 at 16:21

add a commentÂ |Â

3

do add your own efforts to solve to question when asking... your previous question didn't get an answer, but somehow you've got it for this one.. :)
â€“Â Sundeep
Dec 13 '17 at 16:21

do add your own efforts to solve to question when asking... your previous question didn't get an answer, but somehow you've got it for this one.. :)
â€“Â Sundeep
Dec 13 '17 at 16:21

add a commentÂ |Â

4 Answers
4

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up vote
5
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Very standard case, the simplest solution with awk would be

awk -F: '$2 != ""' file

and with grep:

grep :. file

edited Dec 13 '17 at 16:15

StÃ©phane Chazelas

282k53520854

answered Dec 13 '17 at 16:10

jimmij

28.9k867100

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up vote
3
down vote

If you mean to skip Hello: lines you can use something like:

awk -F: 'if($2 != "") print ' input_file

answered Dec 13 '17 at 16:08

Romeo Ninov

4,36811625

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At least with GNU awk, and I think with any version of awk, the default action when something evaluates to true is to print. So, if you set the field delimiter to :, to print lines that have a second field, all you need is:

$ awk -F: '$2' file
Hello:Its Me
Hello:How are you
Hello:Bye

However, this will also print cases where the second field is whitespace (a space, or a tab etc), but will not print the line if second field is one or multiple 0s, because awk evaluates this as false.

edited Dec 13 '17 at 23:04

jimmij

28.9k867100

answered Dec 13 '17 at 20:59

terdonâ™¦

122k28230403

add a commentÂ |Â

up vote
0
down vote

Sometimes it is easier to define the remove conditions (grep -v). Example remove when last field is empty:

grep -v ':$' file

answered Dec 14 '17 at 10:17

JJoao

6,7211826

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4 Answers
4

active

oldest

votes

4 Answers
4

active

oldest

votes

up vote
5
down vote

Very standard case, the simplest solution with awk would be

awk -F: '$2 != ""' file

and with grep:

grep :. file

edited Dec 13 '17 at 16:15

StÃ©phane Chazelas

282k53520854

answered Dec 13 '17 at 16:10

jimmij

28.9k867100

add a commentÂ |Â

up vote
5
down vote

Very standard case, the simplest solution with awk would be

awk -F: '$2 != ""' file

and with grep:

grep :. file

edited Dec 13 '17 at 16:15

StÃ©phane Chazelas

282k53520854

answered Dec 13 '17 at 16:10

jimmij

28.9k867100

add a commentÂ |Â

up vote
5
down vote

Very standard case, the simplest solution with awk would be

awk -F: '$2 != ""' file

and with grep:

grep :. file

edited Dec 13 '17 at 16:15

StÃ©phane Chazelas

282k53520854

answered Dec 13 '17 at 16:10

jimmij

28.9k867100

Very standard case, the simplest solution with awk would be

awk -F: '$2 != ""' file

and with grep:

grep :. file

edited Dec 13 '17 at 16:15

StÃ©phane Chazelas

282k53520854

answered Dec 13 '17 at 16:10

jimmij

28.9k867100

edited Dec 13 '17 at 16:15

StÃ©phane Chazelas

282k53520854

edited Dec 13 '17 at 16:15

StÃ©phane Chazelas

282k53520854

edited Dec 13 '17 at 16:15

StÃ©phane Chazelas

282k53520854

answered Dec 13 '17 at 16:10

jimmij

28.9k867100

answered Dec 13 '17 at 16:10

jimmij

28.9k867100

answered Dec 13 '17 at 16:10

jimmij

28.9k867100

add a commentÂ |Â

up vote
3
down vote

If you mean to skip Hello: lines you can use something like:

awk -F: 'if($2 != "") print ' input_file

answered Dec 13 '17 at 16:08

Romeo Ninov

4,36811625

add a commentÂ |Â

up vote
3
down vote

If you mean to skip Hello: lines you can use something like:

awk -F: 'if($2 != "") print ' input_file

answered Dec 13 '17 at 16:08

Romeo Ninov

4,36811625

add a commentÂ |Â

up vote
3
down vote

If you mean to skip Hello: lines you can use something like:

awk -F: 'if($2 != "") print ' input_file

answered Dec 13 '17 at 16:08

Romeo Ninov

4,36811625

If you mean to skip Hello: lines you can use something like:

awk -F: 'if($2 != "") print ' input_file

answered Dec 13 '17 at 16:08

Romeo Ninov

4,36811625

answered Dec 13 '17 at 16:08

Romeo Ninov

4,36811625

answered Dec 13 '17 at 16:08

Romeo Ninov

4,36811625

answered Dec 13 '17 at 16:08

Romeo Ninov

4,36811625

add a commentÂ |Â

up vote
2
down vote

$ awk -F: '$2' file
Hello:Its Me
Hello:How are you
Hello:Bye

edited Dec 13 '17 at 23:04

jimmij

28.9k867100

answered Dec 13 '17 at 20:59

terdonâ™¦

122k28230403

add a commentÂ |Â

up vote
2
down vote

$ awk -F: '$2' file
Hello:Its Me
Hello:How are you
Hello:Bye

edited Dec 13 '17 at 23:04

jimmij

28.9k867100

answered Dec 13 '17 at 20:59

terdonâ™¦

122k28230403

add a commentÂ |Â

up vote
2
down vote

$ awk -F: '$2' file
Hello:Its Me
Hello:How are you
Hello:Bye

edited Dec 13 '17 at 23:04

jimmij

28.9k867100

answered Dec 13 '17 at 20:59

terdonâ™¦

122k28230403

$ awk -F: '$2' file
Hello:Its Me
Hello:How are you
Hello:Bye

edited Dec 13 '17 at 23:04

jimmij

28.9k867100

answered Dec 13 '17 at 20:59

terdonâ™¦

122k28230403

edited Dec 13 '17 at 23:04

jimmij

28.9k867100

edited Dec 13 '17 at 23:04

jimmij

28.9k867100

edited Dec 13 '17 at 23:04

jimmij

28.9k867100

answered Dec 13 '17 at 20:59

terdonâ™¦

122k28230403

answered Dec 13 '17 at 20:59

terdonâ™¦

122k28230403

answered Dec 13 '17 at 20:59

terdonâ™¦

122k28230403

add a commentÂ |Â

up vote
0
down vote

Sometimes it is easier to define the remove conditions (grep -v). Example remove when last field is empty:

grep -v ':$' file

answered Dec 14 '17 at 10:17

JJoao

6,7211826

add a commentÂ |Â

up vote
0
down vote

Sometimes it is easier to define the remove conditions (grep -v). Example remove when last field is empty:

grep -v ':$' file

answered Dec 14 '17 at 10:17

JJoao

6,7211826

add a commentÂ |Â

up vote
0
down vote

Sometimes it is easier to define the remove conditions (grep -v). Example remove when last field is empty:

grep -v ':$' file

answered Dec 14 '17 at 10:17

JJoao

6,7211826

Sometimes it is easier to define the remove conditions (grep -v). Example remove when last field is empty:

grep -v ':$' file

answered Dec 14 '17 at 10:17

JJoao

6,7211826

answered Dec 14 '17 at 10:17

JJoao

6,7211826

answered Dec 14 '17 at 10:17

JJoao

6,7211826

answered Dec 14 '17 at 10:17

JJoao

6,7211826

add a commentÂ |Â

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