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Grabbing strings with awk

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# 1  
Old 01-04-2013
Hammer & Screwdriver Grabbing strings with awk
Hello everyone,
I am doing some sort of analysis for some data about organic solvents, and I have a problem with writing a command to do this:

Here's a sample of my file:

Code:
 
1     ethanol
2     methanol
3     methanol/ethanol
4     ethanol/methanol
5     ethanol/DMF
6     ethyl ether/methanol
7     ethanol methanol
8     methanol ethanol
9     ethanol-Methanol
10   methanol-Ethanol
11   methanol-DMF
12   ethyl ether/Methanol
13   DMF
14   chloroform

This is a tab separated file, I am trying to generate a new file that contains combinations of ethanol and anything else using "awk".
also, I am trying to generate another file that contains exactly the other way around, everything but ethanol.

Please note that the word "Methanol" contains "ethanol" inside it as a string.
Also, the separation is not regular, sometimes a slash and sometimes a space.
Do you know what command i should use to get over this problem?

I am currently using this command :
Code:
 
awk 'BEGIN{IGNORECASE=1} $2 ~ /ethanol/' filepath

but this is giving me methanol as well. I am looking for combinations containing ethanol in one file, and everything else in another file.

Cheers,
# 2  
Old 01-04-2013
Try:
Code:
grep -i '[/ \t-]ethanol' infile

Code:
grep -i '[[:blank:]/-]ethanol' infile

Last edited by Scrutinizer; 01-04-2013 at 10:45 AM..
# 3  
Old 01-04-2013
Try:
Code:
perl -ne 'print if /\bethanol\b/i' file

# 4  
Old 01-04-2013
Probably other solutions...
Now, this solution does eliminate the / characters...

Code:
$ cat sample40.txt
1     ethanol
2     methanol
3     methanol/ethanol
4     ethanol/methanol
5     ethanol/DMF
6     ethyl ether/methanol
7     ethanol methanol
8     methanol ethanol
9     ethanol-Methanol
10   methanol-Ethanol
11   methanol-DMF
12   ethyl ether/Methanol
13   DMF
14   chloroform

$ tr "/" "\t" <sample40.txt | awk 'BEGIN{IGNORECASE=1} ($2 ~/ethanol/ && $2 !~/methanol/) || ($3 ~/ethanol/ && $3 !~/methanol/)'
1     ethanol
3     methanol  ethanol
4     ethanol   methanol
5     ethanol   DMF
7     ethanol methanol
8     methanol ethanol

This User Gave Thanks to joeyg For This Post:
Error404
# 5  
Old 01-04-2013
try also:
Code:
awk 'BEGIN{IGNORECASE=1} $2 ~ /^ethanol/' filepath

# 6  
Old 01-04-2013
Quote:
Originally Posted by joeyg
Now, this solution does eliminate the / characters...

Code:
$ cat sample40.txt
1     ethanol
2     methanol
3     methanol/ethanol
4     ethanol/methanol
5     ethanol/DMF
6     ethyl ether/methanol
7     ethanol methanol
8     methanol ethanol
9     ethanol-Methanol
10   methanol-Ethanol
11   methanol-DMF
12   ethyl ether/Methanol
13   DMF
14   chloroform
 
$ tr "/" "\t" <sample40.txt | awk 'BEGIN{IGNORECASE=1} ($2 ~/ethanol/ && $2 !~/methanol/) || ($3 ~/ethanol/ && $3 !~/methanol/)'
1     ethanol
3     methanol  ethanol
4     ethanol   methanol
5     ethanol   DMF
7     ethanol methanol
8     methanol ethanol

Thanks for the command dude. I honestly don't understand what it means but, it worked out for me! ( i mean the first part [[ tr"/" "\t" ]])
It would be very kind if you tell me what you did up there!

Thank you!
# 7  
Old 01-04-2013
tr "/" "\t" translates all the forward slash / to horizontal tab \t

For further reference on tr command check the manual here
This User Gave Thanks to Yoda For This Post:
Error404
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