Question

这篇文章是我之前提到的问题的修正案here。

说我有下面的示例文件：

cat sample2.txt
HOST dev@opulex.com
PORT 1066
DATABASE ORACLE_1
SCHEMA DEPT.*;
SCHEMA EMP.*;
DATABASE ORACLE_2
SCHEMA JOB.*;
SCHEMA SALARY.*;
HOST orl@opulex.com
PORT 89
DATABASE MYSQL_1
SCHEMA PURCHASE.*;
DATABASE MYSQL_2
SCHEMA PRICE.*;
SCHEMA PRODUCT.*;

对于上述文件中的内容，我想只打印HOST / PORT / DATABASE / SCHEMA旁边的列，同时假设每行中的最后一列以分号结尾，我想替换缺少的列值以及上一行的列值。

@anubhava帮助我在我的previous post中获得了接近它的内容。

cat sample2.txt | awk 'tolower($0)~/^host|^port|^database|^schema/{printf "%s",$2 OFS;}' | awk -v RS=';' -v ORS=';\n' 'NF' | awk 'NF==1{print c1, c2, c3, $1; next} NF==2{print c1, c2, $1, $2; next} {c1=$1; c2=$2; c3=$3} 1' | sed 's|^[[:blank:]]*||g; s|\;$||g'
    dev@opulex.com 1066 ORACLE_1 DEPT.*
    dev@opulex.com 1066 ORACLE_1 EMP.*
    dev@opulex.com 1066 ORACLE_2 JOB.*
    dev@opulex.com 1066 ORACLE_1 SALARY.*
    orl@opulex.com 89 MYSQL_1 PURCHASE.*
    orl@opulex.com 89 MYSQL_2 PRICE.*
    orl@opulex.com 89 MYSQL_1 PRODUCT.*

但我期待它如下：

dev@opulex.com 1066 ORACLE_1 DEPT.*
dev@opulex.com 1066 ORACLE_1 EMP.*
dev@opulex.com 1066 ORACLE_2 JOB.*
dev@opulex.com 1066 ORACLE_2 SALARY.*
orl@opulex.com 89 MYSQL_1 PURCHASE.*
orl@opulex.com 89 MYSQL_2 PRICE.*
orl@opulex.com 89 MYSQL_2 PRODUCT.*

由于

Answer 1

您可以使用此单一awk 命令获取输出：

awk '{sub(/;$/, "")} $1=="HOST"{host=$2} $1=="PORT"{port=$2} $1=="DATABASE"{db=$2}
      $1=="SCHEMA"{print host, port, db, $2}' sample2.txt

dev@opulex.com 1066 ORACLE_1 DEPT.*
dev@opulex.com 1066 ORACLE_1 EMP.*
dev@opulex.com 1066 ORACLE_2 JOB.*
dev@opulex.com 1066 ORACLE_2 SALARY.*
orl@opulex.com 89 MYSQL_1 PURCHASE.*
orl@opulex.com 89 MYSQL_2 PRICE.*
orl@opulex.com 89 MYSQL_2 PRODUCT.*

<强>解释

sub函数正在从每行删除尾随;
当$1=="HOST"我们将第二列存储在变量host
当$1=="PORT"我们将第二列存储在变量port
当$1=="DATABASE"我们将第二列存储在变量db
当$1=="SCHEMA"打印host, port, db, 2nd column

Answer 2

import SpriteKit

class GameScene: SKScene {
    //global declarations
    let player = SKSpriteNode(imageNamed: "mage")
    let fireball = SKSpriteNode(imageNamed: "fireball")

    override func didMoveToView(view: SKView) {
        /* Setup your scene here */
        createScene()
    }
    override func touchesBegan(touches: Set<NSObject>, withEvent event: UIEvent) {
        /* Called when a touch begins */
        for touch in (touches as! Set<UITouch>) {
            let location = touch.locationInNode(self)
            spawnFireball(location)

        }
    }
    override func update(currentTime: CFTimeInterval) {
        /* Called before each frame is rendered */
        self.enumerateChildNodesWithName("fireball", usingBlock: ({
            (node,error) in
            if (self.fireball.position.x < -self.fireball.size.width/2.0 || self.fireball.position.x > self.size.width+self.fireball.size.width/2.0
                || self.fireball.position.y < -self.fireball.size.height/2.0 || self.fireball.position.y > self.size.height+self.fireball.size.height/2.0) {
                self.fireball.removeFromParent()
                self.fireball.removeAllChildren()
                self.fireball.removeAllActions()
            }
        }))
    }
    func createScene() {
        //player
        player.size = CGSizeMake(100, 100)
        player.position = CGPointMake(self.frame.size.width/2, self.frame.size.height/2 + 50)
        player.zPosition = 2.0
        self.addChild(player)
    }
    func spawnFireball(point: CGPoint) {
        //setup
        fireball.name = "fireball"
        fireball.size = CGSizeMake(100, 50)
        let fireballCenter = CGPointMake(fireball.size.width / 4 * 3, fireball.size.height / 2)
        fireball.position = player.position
        fireball.physicsBody = SKPhysicsBody(circleOfRadius: fireball.size.height/2, center: fireballCenter)
        fireball.physicsBody?.affectedByGravity = false
        //action
        var dx = CGFloat(point.x - player.position.x)
        var dy = CGFloat(point.y - player.position.y)
        let magnitude = sqrt(dx * dx + dy * dy)
        dx /= magnitude
        dy /= magnitude
        let vector = CGVector(dx: 32.0 * dx, dy: 32.0 * dy)

        var rad = atan2(dy,dx)
        fireball.runAction(SKAction.rotateToAngle(rad, duration: 0.0))
        self.addChild(fireball)
        fireball.physicsBody?.applyImpulse(vector)
    }
}

AWK用前一行的列值替换NULL列值（续）

2 个答案: