awk<\/p>\n
\u2022fields
\n$0\twhole line
\n$1\t1st field
\n$2\t2nd field
\nNF\tnumber of fields
\nNR\tnumber of records<\/p>\n
\u2022pattern operators
\n==
\n!=
\n<\n<=\n>=
\n?:<\/p>\n
\u2022Punctuation
\n{}
\n$
\n~\tcontains
\n!~\tnot contain
\n,\tseparate things in “print”
\n;\tseparate statements
\n\/\/\tused around regular expression
\n()\tgrouping<\/p>\n
\u2022they are same
\nawk ‘$1 > $2’
\nawk ‘$1 > $2{print}’
\nawk ‘$1 > $2{print $0}’<\/p>\n
\u00a7samples
\n\u2022Print second field then first
\nawk ‘{print $2,$1}’ file<\/p>\n
\u2022Checks for matching string:
\nawk ‘$1==”foo”{print $2}’ file<\/p>\n
\u2022Search all lines that contain foo*.bar
\nawk ‘\/foo*.bar\/{print $1,$3}’ file<\/p>\n
\u2022foo occurs in second field
\nawk ‘$2~\/foo\/{print $3,$1}’ file<\/p>\n
\u2022foo not occur in second field
\nawk ‘$2!~\/foo\/{print $3,$1}’ file<\/p>\n
\u2022Prints all lines between and including lines that contain foo and bar
\nawk ‘\/foo\/,\/bar\/’ file<\/p>\n
\u2022Prints running total of 5th column
\nls -l | awk ‘{print x+=$5,$0}’<\/p>\n
\u00a7BEGIN and END
\n\u2022awk ‘BEGIN{print “fee”} $1==”foo” {print “fi”} END {print “foo fum”}’ filename<\/p>\n
\u00a7awk variables
\n\u2022Field separater
\nawk -F: ‘{print $1,$3}’ \/etc\/passwd<\/p>\n
\u2022Delete 10th field from each line
\nawk ‘{$10=””; print}’ filename<\/p>\n
\u2022C like for, while, do-while, if awk \u2022fields $0 whole line $1 1st field $2 2nd field NF number of fields NR number of records \u2022pattern operators == != < = ?: \u2022Punctuation {} $ ~ contains !~ not contain , separate things in “print” ; … Continue reading
\nawk ‘{for(i=1;i