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[root@priti ]$ cat stats_2022102118.log | awk -F';' '{ for(i=1; i<=NF; i++){ if ($i ~ /^creq_recv=/) { print $i}}}' creq_recv=0 creq_recv=0 creq_recv=0 creq_recv=0cat. If you don't wanttail -fto watch the file, just give the file to awk directly:awk -F';' '{...}' stats_2022102118.log. But, really, thegrepapproach is simpler.|;ingrep -oP '(?=^|;)creq_recv=[^;]+'does not make sense,creq_recvwill never start with;, it will always start withc. ITYM(?<=instead of(?=