Login or Register to Ask a Question and Join Our Community


Shell Programming and Scripting

Awk product of nth field

Login to Discuss or Reply to this Discussion in Our Community

 
Thread Tools Search this Thread
Top Forums Shell Programming and Scripting Awk product of nth field
# 1  
Old 09-12-2012
Awk product of nth field
How do I do the product of nth filed just like sum. For sum I know like
Code:
awk '{ sum += $12 } END {printf "%.2f\n", sum}'

works as initial sum = 0.

But for product how do initialize the variable to 1?
Last edited by Franklin52; 09-13-2012 at 05:23 AM.. Reason: Please use code tags for data and code samples
# 2  
Old 09-12-2012
This should work for most awk versions:

Code:
awk '{ p *= $1 } END{ print p }' p=1 input-file


For gnu awk, and other recent versions, an alternative:

Code:
awk -v p=1 '{ p *= $1 } END{ print p }'  input-file

---------- Post updated at 19:51 ---------- Previous update was at 19:51 ----------

Of course you can use printf() as you did in your example instead of print.
This User Gave Thanks to agama For This Post:
madhavb
# 3  
Old 09-12-2012
This works for LinuxMint (i.e. Ubuntu, i.e. Debian, ...):

Code:
awk 'BEGIN{ p=1 } { p *= $1 } END{ print p }' input_filename

and personally I find it neater to read...
Login or Register to Ask a Question

Previous Thread | Next Thread

10 More Discussions You Might Find Interesting

1. Shell Programming and Scripting

Printing string from last field of the nth line of file to start (or end) of each line (awk I think)

My file (the output of an experiment) starts off looking like this, _____________________________________________________________ Subjects incorporated to date: 001 Data file started on machine PKSHS260-05CP ********************************************************************** Subject 1,... (9 Replies)
Discussion started by: samonl
9 Replies

2. UNIX for Beginners Questions & Answers

Use strings from nth field from one file to match strings in entire line in another file, awk

I cannot seem to get what should be a simple awk one-liner to work correctly and cannot figure out why. I would like to use patterns from a specific field in one file as regex to search for matching strings in the entire line ($0) of another file. I would like to output the lines of File2 which... (1 Reply)
Discussion started by: jvoot
1 Replies

3. Shell Programming and Scripting

Replace a value of Nth field of nth row

Using Awk, how can I achieve the following? I have set of record numbers, for which, I have to replace the nth field with some values, say spaces. Eg: Set of Records : 4,9,10,55,89,etc I have to change the 8th field of all the above set of records to spaces (10 spaces). Its a delimited... (1 Reply)
Discussion started by: deepakwins
1 Replies

4. Shell Programming and Scripting

awk - printing nth field based on parameter

I have a need to print nth field based on the parameter passed. Suppose I have 3 fields in a file, passing 1 to the function should print 1st field and so on. I have attempted below function but this throws an error due to incorrect awk syntax. function calcmaxlen { FIELDMAXLEN=0 ... (5 Replies)
Discussion started by: krishmaths
5 Replies

5. UNIX for Dummies Questions & Answers

Print Nth to last field

Hey, I'm sure this is answered somewhere but my Googling has turned up nothing. I have a file with data in the following format: <desription of event> at <time and date>The desription of the event is variable length and hence when the list is displayed it is hard to easily see the date (and... (8 Replies)
Discussion started by: RECrerar
8 Replies

6. UNIX for Dummies Questions & Answers

change field separator only from nth field until NF

Hi ! input: 111|222|333|aaa|bbb|ccc 999|888|777|nnn|kkk 444|666|555|eee|ttt|ooo|ppp With awk, I am trying to change the FS "|" to "; " only from the 4th field until the end (the number of fields vary between records). In order to get: 111|222|333|aaa; bbb; ccc 999|888|777|nnn; kkk... (1 Reply)
Discussion started by: beca123456
1 Replies

7. Shell Programming and Scripting

Using AWK to find top Nth values in Nth column

I have an awk script to find the maximum value of the 2nd column of a 2 column datafile, but I need to find the top 5 maximum values of the 2nd column. Here is the script that works for the maximum value. awk 'BEGIN { subjectmax=$1 ; max=0} $2 >= max {subjectmax=$1 ; max=$2} END {print... (3 Replies)
Discussion started by: ncwxpanther
3 Replies

8. Shell Programming and Scripting

How to Print from nth field to mth fields using awk

Hi, Is there any short method to print from a particular field till another filed using awk? Example File: File1 ==== 1|2|acv|vbc|......|100|342 2|3|afg|nhj|.......|100|346 Expected output: File2 ==== acv|vbc|.....|100 afg|nhj|.....|100 (8 Replies)
Discussion started by: machomaddy
8 Replies

9. Shell Programming and Scripting

how to find the nth field value in delimiter file in unix using awk

Hi All, I wanted to find 200th field value in delimiter file using awk.? awk '{print $200}' inputfile I am getting error message :- awk: The field 200 must be in the range 0 to 199. The source line number is 1. The error context is {print >>> $200 <<< } using... (4 Replies)
Discussion started by: Jairaj
4 Replies

10. Shell Programming and Scripting

awk substitute variable value in nth field

I have a large csv file that looks like this: The 3rd field is a unix time stamp that I want to convert to human readable. I wrote a bash script with this code: IFS=$',' cat $1 | while read ID user DATE text flags read; do echo -e "$ID,$user,$(date -d @$DATE),$text,$flags,$read... (3 Replies)
Discussion started by: stumpyuk
3 Replies
Login or Register to Ask a Question