awk - Compare two files and print Available and NotFound -Continuation: -

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would compare second field f11.txt , first field f22.txt print match cases "available" , non match cases "notfound" if field $4 (file f11.txt) null, if field $4 (file f11.txt) not null print lines of f11.txt is.

inputs:  f11.txt a,10,zzz b,20,zzz,yyy c,50,zzz  f22.txt 10,yyy 20,yyy 30,yyy 40,yyy

have tried below command, sat help.

awk -f "," 'nr==fnr{a[$1]=$0;next}{print $0 "," (a[$2]?"available":"notfound")  }' f22.txt f11.txt

got below output 

a,10,zzz,available b,20,zzz,yyy,available c,50,zzz,notfound

where b,20,zzz,yyy match case don’t want override "available" $4 not null (empty)

expected output:

a,10,zzz,avilable b,20,zzz,yyy c,50,zzz,notfound

i believe script below want

begin {     fs=ofs="," }  nr==fnr {     a[$1]=$0     next }  !$4 {     $4 = (a[$2] ? "available" : "notfound") }  1

updated script explicitely check empty fourth field (to allow longer lines empty fourth field. updated again replace empty fourth field instead of appending field.


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