How the AWK works when 2 files are interchanged in a script while comparing

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In the below awk script, when the file names are interchanged I could see 2 different result. I'm curious to know here how awk writes output to the console with different result in each case

File 1:

abc bca cdb

abc few bre

bbc bba cdb

cbc frw bte

File 2:

abc bca cdb

gbc fiw bpe

bbc bca cdb

cbc frw bte

Script :

awk 'FNR==NR a[$1$2$3]++;next;!(($1$2$3) in a)' **file1 file2**

Output :

gbc fiw bpe

bbc bca cdb

Script:

awk 'FNR==NR a[$1$2$3]++;next;!(($1$2$3) in a)' **file2 file1**

Output:

abc few bre

bbc bba cdb

edited Jul 18 at 14:26

Jesse_b

10.1k22658

asked Jul 18 at 13:14

Varun Gowda

add a commentÂ |Â

up vote
-2
down vote

favorite

In the below awk script, when the file names are interchanged I could see 2 different result. I'm curious to know here how awk writes output to the console with different result in each case

File 1:

abc bca cdb

abc few bre

bbc bba cdb

cbc frw bte

File 2:

abc bca cdb

gbc fiw bpe

bbc bca cdb

cbc frw bte

Script :

awk 'FNR==NR a[$1$2$3]++;next;!(($1$2$3) in a)' **file1 file2**

Output :

gbc fiw bpe

bbc bca cdb

Script:

awk 'FNR==NR a[$1$2$3]++;next;!(($1$2$3) in a)' **file2 file1**

Output:

abc few bre

bbc bba cdb

edited Jul 18 at 14:26

Jesse_b

10.1k22658

asked Jul 18 at 13:14

Varun Gowda

add a commentÂ |Â

up vote
-2
down vote

favorite

In the below awk script, when the file names are interchanged I could see 2 different result. I'm curious to know here how awk writes output to the console with different result in each case

File 1:

abc bca cdb

abc few bre

bbc bba cdb

cbc frw bte

File 2:

abc bca cdb

gbc fiw bpe

bbc bca cdb

cbc frw bte

Script :

awk 'FNR==NR a[$1$2$3]++;next;!(($1$2$3) in a)' **file1 file2**

Output :

gbc fiw bpe

bbc bca cdb

Script:

awk 'FNR==NR a[$1$2$3]++;next;!(($1$2$3) in a)' **file2 file1**

Output:

abc few bre

bbc bba cdb

edited Jul 18 at 14:26

Jesse_b

10.1k22658

asked Jul 18 at 13:14

Varun Gowda

In the below awk script, when the file names are interchanged I could see 2 different result. I'm curious to know here how awk writes output to the console with different result in each case

File 1:

abc bca cdb

abc few bre

bbc bba cdb

cbc frw bte

File 2:

abc bca cdb

gbc fiw bpe

bbc bca cdb

cbc frw bte

Script :

awk 'FNR==NR a[$1$2$3]++;next;!(($1$2$3) in a)' **file1 file2**

Output :

gbc fiw bpe

bbc bca cdb

Script:

awk 'FNR==NR a[$1$2$3]++;next;!(($1$2$3) in a)' **file2 file1**

Output:

abc few bre

bbc bba cdb

edited Jul 18 at 14:26

Jesse_b

10.1k22658

asked Jul 18 at 13:14

Varun Gowda

edited Jul 18 at 14:26

Jesse_b

10.1k22658

edited Jul 18 at 14:26

Jesse_b

10.1k22658

edited Jul 18 at 14:26

Jesse_b

10.1k22658

asked Jul 18 at 13:14

Varun Gowda

asked Jul 18 at 13:14

Varun Gowda

asked Jul 18 at 13:14

Varun Gowda

add a commentÂ |Â

1 Answer
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The first command gives you the lines in file2 that can't be found in file1 while the second command gives you the lines in file1 that can't be found in file2.

For the given data, the code is equivalent to

awk 'FNR==NR a[$0]++; next !($0 in a)'

where a is an array that has been keyed with the lines from the first file. The condition at the end says "print this line (from the second file) if it's not found in the first file".

answered Jul 18 at 15:02

Kusalananda

101k13199312

Thanks for the info...
â€“Â Varun Gowda
Jul 18 at 17:42

add a commentÂ |Â

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1 Answer
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active

oldest

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1 Answer
1

active

oldest

votes

up vote
0
down vote

accepted

The first command gives you the lines in file2 that can't be found in file1 while the second command gives you the lines in file1 that can't be found in file2.

For the given data, the code is equivalent to

awk 'FNR==NR a[$0]++; next !($0 in a)'

where a is an array that has been keyed with the lines from the first file. The condition at the end says "print this line (from the second file) if it's not found in the first file".

answered Jul 18 at 15:02

Kusalananda

101k13199312

Thanks for the info...
â€“Â Varun Gowda
Jul 18 at 17:42

add a commentÂ |Â

up vote
0
down vote

accepted

The first command gives you the lines in file2 that can't be found in file1 while the second command gives you the lines in file1 that can't be found in file2.

For the given data, the code is equivalent to

awk 'FNR==NR a[$0]++; next !($0 in a)'

where a is an array that has been keyed with the lines from the first file. The condition at the end says "print this line (from the second file) if it's not found in the first file".

answered Jul 18 at 15:02

Kusalananda

101k13199312

Thanks for the info...
â€“Â Varun Gowda
Jul 18 at 17:42

add a commentÂ |Â

up vote
0
down vote

accepted

The first command gives you the lines in file2 that can't be found in file1 while the second command gives you the lines in file1 that can't be found in file2.

For the given data, the code is equivalent to

awk 'FNR==NR a[$0]++; next !($0 in a)'

where a is an array that has been keyed with the lines from the first file. The condition at the end says "print this line (from the second file) if it's not found in the first file".

answered Jul 18 at 15:02

Kusalananda

101k13199312

The first command gives you the lines in file2 that can't be found in file1 while the second command gives you the lines in file1 that can't be found in file2.

For the given data, the code is equivalent to

awk 'FNR==NR a[$0]++; next !($0 in a)'

where a is an array that has been keyed with the lines from the first file. The condition at the end says "print this line (from the second file) if it's not found in the first file".

answered Jul 18 at 15:02

Kusalananda

101k13199312

answered Jul 18 at 15:02

Kusalananda

101k13199312

answered Jul 18 at 15:02

Kusalananda

101k13199312

answered Jul 18 at 15:02

Kusalananda

101k13199312

Thanks for the info...
â€“Â Varun Gowda
Jul 18 at 17:42

add a commentÂ |Â

Thanks for the info...
â€“Â Varun Gowda
Jul 18 at 17:42

Thanks for the info...
â€“Â Varun Gowda
Jul 18 at 17:42

add a commentÂ |Â

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