Get maximum per column from CSV file, based on date column

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# 1  
Old 06-29-2017
Get maximum per column from CSV file, based on date column

Hello everyone,

I am using ksh on Solaris 10 and I'm gathering data in a CSV file that looks like this:


What is the best approach on getting the maximum for each column, but only for yesterday's date?

Desired output:

Thank you!
# 2  
Old 06-29-2017
I would approach this problem using AWK.
What have you tried?
# 3  
Old 06-30-2017
I'll take yesterday's date with the following. Should be ok, as I don't intend to run the script close to midnight:

YESTERDAY=`TZ=GMT+24 date +%Y%m%d`;

Then I want to pass YESTERDAY to awk, but nothing I tried worked for me so far.

Then I need to calculate the maximum.
The following is not at all elegant but it works.

awk -F, '{if ($1~/20170629/) {print $9}}' file.txt | sort -nr | head -1

I'll need to do a lot more reading to do it all in awk.
# 4  
Old 06-30-2017
awk -F, -vYD=$(date -d"-1day" +%Y%m%d) '$0 ~ "^" YD {for (i=2; i<=NF; i++) if (MAX[i] <= $i) MAX[i] = $i} END {for (i=2; i<=NF; i++) printf "%s%s", MAX[i], (i<NF)?",":ORS}' file

# 5  
Old 07-03-2017
date doesn't like
date -d"-1day"

So I've changed your code to
awk -F, -vYD=20170702 '$0 ~ "^" YD {for (i=2; i<=NF; i++) if (MAX[i] <= $i) MAX[i] = $i} END {for (i=2; i<=NF; i++) printf "%s%s", MAX[i], (i<NF)?",":ORS}' file

And I get the following:
awk: syntax error near line 1
awk: bailing out near line 1

# 6  
Old 07-03-2017
I missed your mentioning Solaris 10 in post#1, so yes, your date doesn't have -d, and:

Originally Posted by Don Cragun
If you are using a Solaris/SunOS system, use /usr/xpg4/bin/awk or nawk instead of awk.
# 7  
Old 07-10-2017
Using awk I don't get any output.

Using /usr/xpg4/bin/awk I get the following:

/usr/xpg4/bin/awk -F, -vYD=20170629 '$0 ~ "^" YD {for (i=2; i<=NF; i++) if (MAX[i] <= $i) MAX[i] = $i} END {for (i=2; i<=NF; i++) printf "%s%s", MAX[i], (i<NF)?",":ORS}' values.txt
Invalid form for variable assignment: $0 ~ "^" YD {for (i=2; i<=NF; i++) if (MAX[i] <= $i) MAX[i] = $i} END {for (i=2; i<=NF; i++) printf "%s%s", MAX[i], (i<NF)?",":ORS}

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