Urgent: Help on grep the nearest value using bash script
 

Hi,

I have a list of data in text files with :-
ColA ColB ColC ColD ColE ColF
12 122 2280 30 0.012987 1.776
13 118 2280 30 0.012987 1.954
14 115 2620 30 0.011321 2.131
15 113 2654 30 0.011177 2.309
16 145 1882 25 0.013110 2.487
17 112 2817 30 0.010537 2.664
18 126 2833 30 0.010479 2.842
19 111 2833 30 0.010479 3.020
16 145 1882 25 0.013110 2.487
17 112 2817 30 0.010537 2.664

How could I grep the nearest number to <=3.000 using bash script?

Means in the end i would like to isolate numbers in ColF which last seen the value <= 3.000 which is

18 126 2833 30 0.010479 2.842


Please help. Thanks.

Re: Urgent: Help on grep the nearest value using bash script
 

Hey there,

This was bugging me all last night, and I finally figured out what my problem was ;)

This should do the trick for you:

awk 'BEGIN {var=3; highest=0}{ j = $NF;if ( j < var && j > highest ) { highest=j} } END {print highest}' YourInputFile

That gave me

2.842

from the text you pasted in this post. There's probably a more elegant solution out there, but this'll do the trick for now :)

Best wishes :)

, Mike

Re: Urgent: Help on grep the nearest value using bash script
 

Actually, oops, you can change the

j < var

part to

j <= var

just noticed that :)

awk 'BEGIN {var=3; highest=0}{ j = $NF;if ( j <= var && j > highest ) { highest=j} } END {print highest}' YourInputFile

, Mike

Re: Urgent: Help on grep the nearest value using bash script
 

awk '$NF <=3 {a[NR]=$NF;c[a[NR]]=$0}

END{

 n=asort(a,b)

 print c[b[n]] 

}' file

output:

# ./test.sh

18 126 2833 30 0.010479 2.842

Re: Urgent: Help on grep the nearest value using bash script
 

I knew there was a better answer out there :)

GhostDog74, you are an awk master! If you don't mind me posting this here, could you point me to a good awk tutorial on the web. I'd like to better understand a lot of programmatical aspects of it.

Thanks in advance and good stuff :)

Cheers,

Mike

Re: Urgent: Help on grep the nearest value using bash script
 

no i am not. there are many who are better:)


this is where i learn AWK/SED. Also grymoire is worth a look

Re: Urgent: Help on grep the nearest value using bash script
 

Cool,

Thank you very much :) I'll definitely check out these links (already adding them to my favorites).

You're very humble and come up with some excellent answers. I'm sure I'll see more in the future and I look forward to it :)

Thanks, again!

, Mike