awk - Grep specific part of string from another file -


i want grep first 3 digits of numbers in 1.txt first 3 digits after zeros in 2.txt.

cat 1.txt

 23456  12345  6789

cat 2.txt

 20000023485 xxx888  20000012356 xxx888  20000067234 xxx234

expected output

 20000023485 xxx888  20000012356 xxx888 

awk 'fnr==nr {a[substr($1,0,3)];next}              {match($1, /0+/);              if(substr($1, rstart+rlength,3) in a)print}' 1.txt 2.txt

{a[substr($1,0,3)];next} - stores first 3 characters in associative array.

match($1, /0+/);if(substr($1, rstart+rlength,3) in a) matches 3 charaacters after series of zeroes , checks whether these 3 characters present in associative array created earlier , prints whole line if match found.


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