awk 例子
awk [-F|-f|-v] ‘BEGIN{} //{command1; command2} END{}’ file
匹配
input file R00,R01,R02,R03
output file a:R00,R01
output file b:R02,R03
awk -F, 'BEGIN{OFS=","} {if (NF<3) {print $0} else if(/R0[0-1]/){print $0}} '
awk -F, '/4/ {print $0}'
awk -F, '$1~/4/ {print $0}'