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    <p>Another possible (system-admin) way, avoiding database and SQL queries plus a whole lot of requirements in runtime processes and hardware resources.</p> <p><strong>Update 20/04</strong> Added more code and simplified approach:-</p> <ol> <li><a href="https://stackoverflow.com/questions/6819601/convert-datetime-in-to-epoch-using-awk-piped-data">Convert the timestamp</a> to seconds (from Epoch) and use UNIX <code>sort</code>, using email and this new field (that is: <code>sort -k2 -k4 -n -t, &lt; converted_input_file &gt; output_file</code>)</li> <li>Initialize 3 variable, <code>EMAIL</code>, <code>PREV_TIME</code> and <code>COUNT</code></li> <li>Interate over each line, if new email is encountered, add "1,0 day". Update <code>PREV_TIME=timestamp</code>, <code>COUNT=1</code>, <code>EMAIL=new_email</code></li> <li>Next line: 3 possible scenario <ul> <li>a) if same email, different timestamp: calculate days, increment COUNT=1, update PREV_TIME, add "Count, Difference_in_days"</li> <li>b) If same email, same timestamp: increment COUNT, add "COUNT, 0 day"</li> <li>c) If new email, start from 3.</li> </ul></li> </ol> <p>Alternative to 1. is to add a new field TIMESTAMP and remove it upon printing out the line.</p> <p>Note: If 1.5GB is too huge to sort at a go, split it into smaller chuck, using email as the split point. You can run these chunks in parallel on different machine</p> <pre><code>/usr/bin/gawk -F'","' ' { split("JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC", month, " "); for (i=1; i&lt;=12; i++) mdigit[month[i]]=i; print $0 "," mktime(substr($4,6,4) " " mdigit[substr($4,3,3)] " " substr($4,1,2) " 00 00 00" )}' &lt; input.txt | /usr/bin/sort -k2 -k7 -n -t, &gt; output_file.txt </code></pre> <p>output_file.txt:</p> <blockquote> <p>"DF","00000000@11111.COM","FLTINT1000130394756","26JUL2010","B2C","6799.2",1280102400 "DF","0001HARISH@GMAIL.COM","NF252022031180","09DEC2010","B2C","3439",1291852800 "DF","0001HARISH@GMAIL.COM","NF251742087846","12DEC2010","B2C","1000",1292112000 "DF","0001HARISH@GMAIL.COM","NF251352240086","22DEC2010","B2C","4006",1292976000<br> ...</p> </blockquote> <p>You pipe the output to Perl, Python or AWK script to process step 2. through 4.</p>
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    1. PONeed to compare very large files around 1.5GB in python
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    1. COThis [gawk script](https://github.com/alkhoo/scripts/blob/master/epoch_gawk.sh) performs the COUNT and DAYS calculation on my sorted output
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    2. COIt worked out thanks man :)! I have applied split according to , only [root@amanka Desktop]# gawk 'BEGIN{ OFS = ","; COUNT = 0; PREV_TIME=0; EMAIL=0; while(( getline line<"aven.csv") > 0 ) { split(line, a , ",") if (EMAIL != a[2]) { EMAIL = a[2]; COUNT = 1; PREV_TIME = a[7]; print line, "1,0 day" } else { if (PREV_TIME == a[7]) { COUNT = COUNT + 1; print line, COUNT, "0 day"; } else { DAYS = ((a[7] - PREV_TIME)/(60*60*24)); PREV_TIME = a[7]; COUNT = COUNT + 1; print line, COUNT, DAYS " days"; } } } }'
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    3. COYou're welcome. I'd be curious to know 1) How much memory did gawk+sort use? and 2) How much time it took on the 1.5gb file?
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