The basic operation of Awk is to scan a sequence of input lines, from any number of files, one after another, searching for lines that are matched by any of the patterns in the program. The precise meaning of “match” depends on the pattern in ques
awk '$3 == 0 { print $1 }' file1 file2
$ awk '$3 == 0 { print $1 }'
awk -f progfile optional list of input files
awk '{ print }' emp.data is same as awk '{ print $0 }' emp.dataAwk counts the number of fields in the current input line and stores the count in a built-in variable called NF
awk '{ print NF, $1, $NF }' emp.data # wNF, the Number of Fields
awk '{ print NR, NF, $1, $NF }' emp.data # prints the number of fields and the first and last fields of each input line.
awk '{ print "total pay of emp is", $1, "is", $2 * $3 }' emp.data # Putting Text in the Output
awk -f first.awk emp.data
awk '{ printf("Total Pay of %s is %f\n"), $1, $3 }' emp.data
awk '{ printf("Total Pay of %s is %.2f\n"), $1, $3 }' emp.data
awk '{ printf("Total Pay of %-8s is %.2f\n", $1, $2 * $3) }' emp.data
awk '{ printf("Total Pay of %-8s is %6.2f\n", $1, $2 * $3) }' emp.data
awk '{ printf("Total Pay of %-8s is %6.2f\n", $1, $2 * $3) }' emp.data | sort -r # Sorting$1 == "Susie"
$2 >= 20
$2 * $3 > 200
$2 >= 20 || $3 >= 20
$2 >= 20 && $3 >= 20
$2 >= 20 ! $3 >= 20
!($2 < 20 && $3 < 20)
React
Typescript
Django
Laravel
Facebook
Microsoft
Google
Alibaba
D3
Tencent