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Shell Programming and Scripting

Logical AND operation with egrep

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# 8  
Old 09-01-2009
Its not like 'grep' will not work with csv file. It will work with all kind of text file, even with binary files.

But in case of CSV you might be having a separator, so don't forget to include separator in the pattern match.

If the colon is separator then,
Code:
egrep str1:str2:str3

# 9  
Old 09-02-2009
If you want to find ALL combinations of str1 str2 str3 in a line from a CSV file, there is no easy regex solution. Either you pipe successive egrep's like in the joeyg's example or you can use awk.

To find all lines containing Joe and Linda in any order:
Code:
$ cat > test.file
Joe,Linda,Bobby,Terry
Kim,Rhonda,Steve,Joe
Linda,Joe,Bob,Terry

$ awk -F"," '{flag=0;for (i=1;i<=NF;i++) if($i ~ /Joe|Linda/) flag++} flag==2 {print}' test.file
Joe,Linda,Bobby,Terry
Linda,Joe,Bob,Terry

Now, imagine we are after lines with Bob and Joe, the above awk snippet will logically return:
Code:
$ awk -F"," '{flag=0;for (i=1;i<=NF;i++) if($i ~ /Joe|Bob/) flag++} flag==2 {print}' test.file
Joe,Linda,Bobby,Terry
Linda,Joe,Bob,Terry

As awk use POSIX regex we can use the ^ and $ metacharacters:
Code:
$ awk -F"," '{flag=0;for (i=1;i<=NF;i++) if($i ~ /^(Joe|Bob)$/) flag++} flag==2 {print}' test.file
Linda,Joe,Bob,Terry

# 10  
Old 09-02-2009
Quote:
Originally Posted by ripat
If you want to find ALL combinations of str1 str2 str3 in a line from a CSV file, there is no easy regex solution.
What about this?

Code:
awk '/str1/ && /str2/ && /str3/' file

# 11  
Old 09-02-2009
Quote:
Originally Posted by Franklin52
What about this?

Code:
awk '/str1/ && /str2/ && /str3/' file

[EMBARASSED]
Well, it's so much... better! And so obvious.
[/EMBARASSED]
# 12  
Old 09-02-2009
My string is coming through web application in a variable
like
VARIABLE="str1 str2 str3"

i need to use this variable in search.

This is not working when i am using my variable

awk '/$VARIABLE/' file Smilie
Last edited by sam25; 09-02-2009 at 12:08 PM..
# 13  
Old 09-02-2009
perhaps this ...

Code:
awk -v n=$variable '/n/' file

# 14  
Old 09-02-2009
not working error coming

$awk -v n=$key '/n/' file.csv
awk: Cannot find or open file /n/.
The source line number is 1.
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