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Awk: print lines with one of multiple pattern in the same field (column)


 
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# 1  
Old 01-20-2014
Linux Awk: print lines with one of multiple pattern in the same field (column)

Hi all,

I am new to using awk and am quickly discovering what a powerful pattern-recognition tool it is. However, I have what seems like a fairly basic task that I just can't figure out how to perform in one line. I want awk to find and print all the lines in which one of multiple patterns (e.g. "A" or "B") appears in a column.

I've gotten this far:
Code:
awk '$3 == "A" {print $0}' file.txt > newfile.txt
awk '$3 == "B" {print $0}' file.txt >> newfile.txt

but I really want to be able to specify in one step "A" OR "B"...

Many thanks!

Last edited by Franklin52; 01-21-2014 at 03:16 AM.. Reason: Please use code tags
# 2  
Old 01-20-2014
It should be as follows:
Code:
awk '$3=="A";$3=="B" {print $0}' file.txt

Regards,
Srikanth

Last edited by Franklin52; 01-21-2014 at 03:17 AM.. Reason: Code tags
This User Gave Thanks to srikanth38 For This Post:
# 3  
Old 01-20-2014
If you are looking for pattern match and not for a strict comparison, use ~ operator:
Code:
awk '$3 ~ /A/ || $3 ~ /B/' file.txt


Last edited by Yoda; 01-20-2014 at 12:29 PM.. Reason: correction
This User Gave Thanks to Yoda For This Post:
# 4  
Old 01-20-2014
Code:
$ awk '$3 ~ /A|B/' file

This User Gave Thanks to Akshay Hegde For This Post:
# 5  
Old 01-20-2014
Code:
awk '$3=="A" || $3=="B"  {print $0}'  file.txt

This User Gave Thanks to blackrageous For This Post:
# 6  
Old 01-20-2014
Quote:
Originally Posted by Yoda
If you are looking for pattern match and not for a strict comparison, use ~ operator:
Code:
awk '$3 ~ A || $3 ~ B' file.txt


Code:
$ cat <<test | awk '$1 ~ /A|B/'
A
C
B
BB
D
test
A
B
BB

$ cat <<test | awk '$1 ~ A || $1 ~ B' # Variable  ???
A
C
B
BB
D
test

A
C
B
BB
D

$ cat <<test | awk '$1 ~ /A/ || $1 ~ /B/'
A
C
B
BB
D
test

A
B
BB

$ cat <<test | awk '$1 ~ A || $1 ~ B' A=A B=B
A
C
B
BB
D
test

A
B
BB

$ cat <<test | awk '$1 ~ "A" || $1 ~ "B"'
A
C
B
BB
D
test

A
B
BB

# 7  
Old 01-20-2014
Hello,

with strict match:

Code:
awk -vs1="A" -vs2="B" '$3==s1 || $3==s2 {print}' file_name

with non-strict match:

Code:
awk -vs1="A" -vs2="B" '$3~s1 || $3~s2 {print}' file_name

Thanks,
R. Singh
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