Compare two files line by line and show only difference from file 2

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up vote
2
down vote

favorite

I want to compare two files line by line without sorting and show only difference from file2.

file 1.txt:

one
two
three
four
five
six
seven
eight
nine
ten

file 2.txt:

one
five
three
four
five
twelve
seven
eight
hundred
ten

Then output should be

five 
twelve
hundred

I do not want to sort files.

command-line text-processing

share|improve this question

edited 1 hour ago

muru

130k19275470

asked 3 hours ago

Vishal Patel

111

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Vishal Patel is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
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• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  Read man comm
  – waltinator
  2 hours ago
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  comm will complain that order is not sorted.
  – Kristopher Ives
  2 hours ago
  

  
  
  
  

add a comment | 

up vote
2
down vote

favorite

I want to compare two files line by line without sorting and show only difference from file2.

file 1.txt:

one
two
three
four
five
six
seven
eight
nine
ten

file 2.txt:

one
five
three
four
five
twelve
seven
eight
hundred
ten

Then output should be

five 
twelve
hundred

I do not want to sort files.

command-line text-processing

share|improve this question

edited 1 hour ago

muru

130k19275470

asked 3 hours ago

Vishal Patel

111

New contributor

Vishal Patel is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.

• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  Read man comm
  – waltinator
  2 hours ago
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  comm will complain that order is not sorted.
  – Kristopher Ives
  2 hours ago
  

  
  
  
  

add a comment | 

up vote
2
down vote

favorite

up vote
2
down vote

favorite

I want to compare two files line by line without sorting and show only difference from file2.

file 1.txt:

one
two
three
four
five
six
seven
eight
nine
ten

file 2.txt:

one
five
three
four
five
twelve
seven
eight
hundred
ten

Then output should be

five 
twelve
hundred

I do not want to sort files.

command-line text-processing

share|improve this question

edited 1 hour ago

muru

130k19275470

asked 3 hours ago

Vishal Patel

111

New contributor

Vishal Patel is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.

I want to compare two files line by line without sorting and show only difference from file2.

file 1.txt:

one
two
three
four
five
six
seven
eight
nine
ten

file 2.txt:

one
five
three
four
five
twelve
seven
eight
hundred
ten

Then output should be

five 
twelve
hundred

I do not want to sort files.

command-line text-processing

command-line text-processing

share|improve this question

edited 1 hour ago

muru

130k19275470

asked 3 hours ago

Vishal Patel

111

New contributor

Vishal Patel is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.

share|improve this question

edited 1 hour ago

muru

130k19275470

asked 3 hours ago

Vishal Patel

111

New contributor

Vishal Patel is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.

share|improve this question

share|improve this question

edited 1 hour ago

muru

130k19275470

edited 1 hour ago

muru

130k19275470

edited 1 hour ago

muru

130k19275470

130k19275470

asked 3 hours ago

Vishal Patel

111

New contributor

Vishal Patel is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.

asked 3 hours ago

Vishal Patel

111

asked 3 hours ago

Vishal Patel

111

111

New contributor

Vishal Patel is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.

New contributor

Vishal Patel is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.

Vishal Patel is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.

• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  Read man comm
  – waltinator
  2 hours ago
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  comm will complain that order is not sorted.
  – Kristopher Ives
  2 hours ago
  

  
  
  
  

add a comment | 

• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  Read man comm
  – waltinator
  2 hours ago
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  comm will complain that order is not sorted.
  – Kristopher Ives
  2 hours ago
  

  
  
  
  

1

1

Read man comm
– waltinator
2 hours ago

Read man comm
– waltinator
2 hours ago

comm will complain that order is not sorted.
– Kristopher Ives
2 hours ago

comm will complain that order is not sorted.
– Kristopher Ives
2 hours ago

add a comment | 

3 Answers
3

active

oldest

votes

up vote
1
down vote

Doing line-by-line comparison using awk, you could do:

awk ' getline x<"file2" $0!=x print x' file1

• 
  getline x<"file2" reads the entire line from file2 and holds into x variable.


• 
  print x when line from file1 differ with line in file2.

Or same but shorter:

awk ' getline x<"file1" $0!=x' file2

share|improve this answer

answered 1 hour ago

αғsнιη

23.5k2193153

add a comment | 

up vote
0
down vote

You cannot do this without sorting your data. Even if you never explicitly run the sort command, any solution will involving indexing or sorting the data and taking O(n) time or memory to do it. For example, a solution which goes through the files and keeps track of which lines are seen or not seen will take O(n) memory and a solution which sorts the files first will take O(n) time.

share|improve this answer

answered 2 hours ago

Kristopher Ives

1,371613

add a comment | 

up vote
0
down vote

You can as well use diff for that task:

diff --old-line-format="" --unchanged-line-format="" 1.txt 2.txt 

Gives the following output:

five
twelve
hundred

share|improve this answer

edited 33 mins ago

answered 1 hour ago

Videonauth

22.5k116897

• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  You can omit grep and do it with diff file1 file2 | awk '/>/print $2', also you could do it all with diff --old-line-format="" --unchanged-line-format="" file1 file2, so it will not print those lines. see --LTYPE-line-format=LFMT section of man diff for details.
  – Î±Ò“sнιη
  41 mins ago
  
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  I sat here a while fiddling with diff and wasn't able to make it work with diff alone, will definitively change ma answer accordingly, Thank you
  – Videonauth
  31 mins ago
  

  
  
  
  

add a comment | 

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3 Answers
3

active

oldest

votes

3 Answers
3

active

oldest

votes

active

oldest

votes

active

oldest

votes

up vote
1
down vote

Doing line-by-line comparison using awk, you could do:

awk ' getline x<"file2" $0!=x print x' file1

• 
  getline x<"file2" reads the entire line from file2 and holds into x variable.


• 
  print x when line from file1 differ with line in file2.

Or same but shorter:

awk ' getline x<"file1" $0!=x' file2

share|improve this answer

answered 1 hour ago

αғsнιη

23.5k2193153

add a comment | 

up vote
1
down vote

Doing line-by-line comparison using awk, you could do:

awk ' getline x<"file2" $0!=x print x' file1

• 
  getline x<"file2" reads the entire line from file2 and holds into x variable.


• 
  print x when line from file1 differ with line in file2.

Or same but shorter:

awk ' getline x<"file1" $0!=x' file2

share|improve this answer

answered 1 hour ago

αғsнιη

23.5k2193153

add a comment | 

up vote
1
down vote

up vote
1
down vote

Doing line-by-line comparison using awk, you could do:

awk ' getline x<"file2" $0!=x print x' file1

• 
  getline x<"file2" reads the entire line from file2 and holds into x variable.


• 
  print x when line from file1 differ with line in file2.

Or same but shorter:

awk ' getline x<"file1" $0!=x' file2

share|improve this answer

answered 1 hour ago

αғsнιη

23.5k2193153

Doing line-by-line comparison using awk, you could do:

awk ' getline x<"file2" $0!=x print x' file1

• 
  getline x<"file2" reads the entire line from file2 and holds into x variable.


• 
  print x when line from file1 differ with line in file2.

Or same but shorter:

awk ' getline x<"file1" $0!=x' file2

share|improve this answer

answered 1 hour ago

αғsнιη

23.5k2193153

share|improve this answer

share|improve this answer

answered 1 hour ago

αғsнιη

23.5k2193153

answered 1 hour ago

αғsнιη

23.5k2193153

answered 1 hour ago

αғsнιη

23.5k2193153

23.5k2193153

add a comment | 

add a comment | 

up vote
0
down vote

You cannot do this without sorting your data. Even if you never explicitly run the sort command, any solution will involving indexing or sorting the data and taking O(n) time or memory to do it. For example, a solution which goes through the files and keeps track of which lines are seen or not seen will take O(n) memory and a solution which sorts the files first will take O(n) time.

share|improve this answer

answered 2 hours ago

Kristopher Ives

1,371613

add a comment | 

up vote
0
down vote

You cannot do this without sorting your data. Even if you never explicitly run the sort command, any solution will involving indexing or sorting the data and taking O(n) time or memory to do it. For example, a solution which goes through the files and keeps track of which lines are seen or not seen will take O(n) memory and a solution which sorts the files first will take O(n) time.

share|improve this answer

answered 2 hours ago

Kristopher Ives

1,371613

add a comment | 

up vote
0
down vote

up vote
0
down vote

You cannot do this without sorting your data. Even if you never explicitly run the sort command, any solution will involving indexing or sorting the data and taking O(n) time or memory to do it. For example, a solution which goes through the files and keeps track of which lines are seen or not seen will take O(n) memory and a solution which sorts the files first will take O(n) time.

share|improve this answer

answered 2 hours ago

Kristopher Ives

1,371613

You cannot do this without sorting your data. Even if you never explicitly run the sort command, any solution will involving indexing or sorting the data and taking O(n) time or memory to do it. For example, a solution which goes through the files and keeps track of which lines are seen or not seen will take O(n) memory and a solution which sorts the files first will take O(n) time.

share|improve this answer

answered 2 hours ago

Kristopher Ives

1,371613

share|improve this answer

share|improve this answer

answered 2 hours ago

Kristopher Ives

1,371613

answered 2 hours ago

Kristopher Ives

1,371613

answered 2 hours ago

Kristopher Ives

1,371613

1,371613

add a comment | 

add a comment | 

up vote
0
down vote

You can as well use diff for that task:

diff --old-line-format="" --unchanged-line-format="" 1.txt 2.txt 

Gives the following output:

five
twelve
hundred

share|improve this answer

edited 33 mins ago

answered 1 hour ago

Videonauth

22.5k116897

• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  You can omit grep and do it with diff file1 file2 | awk '/>/print $2', also you could do it all with diff --old-line-format="" --unchanged-line-format="" file1 file2, so it will not print those lines. see --LTYPE-line-format=LFMT section of man diff for details.
  – Î±Ò“sнιη
  41 mins ago
  
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  I sat here a while fiddling with diff and wasn't able to make it work with diff alone, will definitively change ma answer accordingly, Thank you
  – Videonauth
  31 mins ago
  

  
  
  
  

add a comment | 

up vote
0
down vote

You can as well use diff for that task:

diff --old-line-format="" --unchanged-line-format="" 1.txt 2.txt 

Gives the following output:

five
twelve
hundred

share|improve this answer

edited 33 mins ago

answered 1 hour ago

Videonauth

22.5k116897

• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  You can omit grep and do it with diff file1 file2 | awk '/>/print $2', also you could do it all with diff --old-line-format="" --unchanged-line-format="" file1 file2, so it will not print those lines. see --LTYPE-line-format=LFMT section of man diff for details.
  – Î±Ò“sнιη
  41 mins ago
  
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  I sat here a while fiddling with diff and wasn't able to make it work with diff alone, will definitively change ma answer accordingly, Thank you
  – Videonauth
  31 mins ago
  

  
  
  
  

add a comment | 

up vote
0
down vote

up vote
0
down vote

You can as well use diff for that task:

diff --old-line-format="" --unchanged-line-format="" 1.txt 2.txt 

Gives the following output:

five
twelve
hundred

share|improve this answer

edited 33 mins ago

answered 1 hour ago

Videonauth

22.5k116897

You can as well use diff for that task:

diff --old-line-format="" --unchanged-line-format="" 1.txt 2.txt 

Gives the following output:

five
twelve
hundred

share|improve this answer

edited 33 mins ago

answered 1 hour ago

Videonauth

22.5k116897

share|improve this answer

share|improve this answer

edited 33 mins ago

edited 33 mins ago

edited 33 mins ago

answered 1 hour ago

Videonauth

22.5k116897

answered 1 hour ago

Videonauth

22.5k116897

answered 1 hour ago

Videonauth

22.5k116897

22.5k116897

• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  You can omit grep and do it with diff file1 file2 | awk '/>/print $2', also you could do it all with diff --old-line-format="" --unchanged-line-format="" file1 file2, so it will not print those lines. see --LTYPE-line-format=LFMT section of man diff for details.
  – Î±Ò“sнιη
  41 mins ago
  
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  I sat here a while fiddling with diff and wasn't able to make it work with diff alone, will definitively change ma answer accordingly, Thank you
  – Videonauth
  31 mins ago
  

  
  
  
  

add a comment | 

• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  You can omit grep and do it with diff file1 file2 | awk '/>/print $2', also you could do it all with diff --old-line-format="" --unchanged-line-format="" file1 file2, so it will not print those lines. see --LTYPE-line-format=LFMT section of man diff for details.
  – Î±Ò“sнιη
  41 mins ago
  
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  I sat here a while fiddling with diff and wasn't able to make it work with diff alone, will definitively change ma answer accordingly, Thank you
  – Videonauth
  31 mins ago
  

  
  
  
  

1

1

You can omit grep and do it with diff file1 file2 | awk '/>/print $2', also you could do it all with diff --old-line-format="" --unchanged-line-format="" file1 file2, so it will not print those lines. see --LTYPE-line-format=LFMT section of man diff for details.
– Î±Ò“sнιη
41 mins ago

You can omit grep and do it with diff file1 file2 | awk '/>/print $2', also you could do it all with diff --old-line-format="" --unchanged-line-format="" file1 file2, so it will not print those lines. see --LTYPE-line-format=LFMT section of man diff for details.
– Î±Ò“sнιη
41 mins ago

I sat here a while fiddling with diff and wasn't able to make it work with diff alone, will definitively change ma answer accordingly, Thank you
– Videonauth
31 mins ago

I sat here a while fiddling with diff and wasn't able to make it work with diff alone, will definitively change ma answer accordingly, Thank you
– Videonauth
31 mins ago

add a comment | 

Vishal Patel is a new contributor. Be nice, and check out our Code of Conduct.

 

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