awk 中的条件语句

是的， ...

# If the second field is "3" print it
$ echo "2 3" | awk '{if ($2 == 3) print $2}'
3

# If the second field is "3" print it
$ echo "2 3" | awk '($2 == 3) {print $2}'
3

# If the second field is "3" print it
$ echo "2 3" | awk '$2==3{print $2}'
3

# If a match for "3" is in a line print the first field of this line
$ echo "2 3" | awk '/3/{print $1}'
2

# If the second field is "3" assign the value of "4" to the variable var then print it
$ echo "2 3" | awk '$2==3{var=4; print var}'
4

# If the second field is "3" assign the value of "yes" to the variable var or otherwise assign "no" to it and print it
$ echo "2 3" | awk 'var = $2 == 3 ? "yes" : "no" {print var}'
yes

# If the second field is "2" assign the value of "yes" to the variable var or otherwise assign "no" to it and print it
$ echo "2 3" | awk 'var=$2==2?"yes":"no"{print var}'
no

# Same as the above but utilizing the conditional expression with the ternary operator ‘?:’  in a function
$ echo "2 3" | awk 'function myfunc(field){var = field == 2 ? "yes" : "no"}; myfunc($2); {print var}'
no