Compare two file

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# 1  
Old 11-11-2013
Compare two file

Dear All,

Could someone please help me in comparing two files,
for example I have two file

file A
2999976 0.0275469
3000001 0.0362459
3000026 0.0362459
3000051 0.0362459

file B
2999976 0.0205469
3000003 0.0362459
3000022 0.0128716
3000051 0.0009189

I would like to write to file all the lines of file A, and where it founds the same first column in file B I would like to report the difference, for example

file output
2999976 0.0275469 - 0.0205469 = 0.0070000
3000001 0.0362459
3000026 0.0362459
3000051 0.0362459 - 0.0009189 = 0,035327

Moreover, if some values are below 0, just delete the entire row from the output file.

Many many thanks,
# 2  
Old 11-11-2013
awk 'NR==FNR{a[$1]=$2;next}$1 in a{$0=$0" - "a[$1]" = "($2-a[$1])}1' FileB FileA

This User Gave Thanks to bartus11 For This Post:
# 3  
Old 11-11-2013
Not in the exact format, but does the job:
join -a1 fileA fileB | awk '{if($3 != ""){print $0, $2-$3}else{print}}'

This User Gave Thanks to balajesuri For This Post:
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