Keep only the closet match of timestamped row (include headers) from file1 to precede file2 row/s Post: 302979415

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Top Forums UNIX for Beginners Questions & Answers Keep only the closet match of timestamped row (include headers) from file1 to precede file2 row/s Post 302979415 by stomp on Sunday 14th of August 2016 10:21:03 AM

08-14-2016

Registered User

Here another possibillity, a bit more stream oriented ...

Code:

perl -MTime::Local -pe '
BEGIN{$fc=1}
s#(([0-9]{4})/([0-9]{2})/([0-9]{2}) ([0-9]{2}):([0-9]{2}):([0-9]{2}))#timelocal($7,$6,$5,$4,$3,$2).",$fc,$1"#e; 
$fc++ if eof;' FILE1 FILE2 | \
\
sort -n | \
\
awk -F, 'FNR<3{print $0;next} 
SRC_OLD==1 && SRC_OLD!=$2 {print LINE_OLD} 
$2==2 {print $0} {SRC_OLD=$2;LINE_OLD=$0}' | \
\
awk -F, 'BEGIN{OFS="\n"} 
FNR==1{H2=$0;next} 
FNR==2{H1=$0;next}  
{FID=$2;sub(/^([^,]+,){2}/,"")} 
FID==1{print H1,$0,H2;next} 
{print}'

Explanation of the steps:

Use Perl to add timestamps as epoch and filenumber at beginning of each line
sort lines using epoch and file nr (Headers stay first, If The Headers change this may break)
remove duplicate file1 lines and keep only the newest
detect the headers and insert them before and after every file1 line and print out the data without the additional fields

...and a bit optimized too(no need to have 2 awk calls)...

Code:

perl -MTime::Local -pe '
BEGIN{$fc=1}
s#(([0-9]{4})/([0-9]{2})/([0-9]{2}) ([0-9]{2}):([0-9]{2}):([0-9]{2}))#timelocal($7,$6,$5,$4,$3,$2).",$fc,$1"#e;
$fc++ if eof;' FILE1 FILE2 | \
\
sort -n  | \
\
awk -F, 'BEGIN{OFS="\n"}
FNR==1{H2=$0;next}
FNR==2{H1=$0;next}
{FID=$2;sub(/^([^,]+,){2}/,"")}
FID_OLD==1 && FID!=1 {print H1,LINE_OLD,H2}
FID==2 {print $0}
{FID_OLD=FID;LINE_OLD=$0}'

Last edited by stomp; 08-14-2016 at 12:50 PM.. Reason: Compacted Code + separated the different steps

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