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从缩进输出中提取行

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从缩进输出中提取行

我想在 shell 命令中解析下面的输出（来自 ddcutil）：

Model: MQ780
MCCS version: 2.1
Commands:
   Op Code: 01 (VCP Request)
   Op Code: 02 (VCP Response)
   Op Code: 03 (VCP Set)
   Op Code: 0C (Save Settings)
   Op Code: E3 (Capabilities Reply)
   Op Code: F3 (Capabilities Request)
VCP Features:
   Feature: 02 (New control value)
   Feature: 04 (Restore factory defaults)
   Feature: 05 (Restore factory brightness/contrast defaults)
   Feature: 08 (Restore color defaults)
   Feature: 10 (Brightness)
   Feature: 12 (Contrast)
   Feature: 14 (Select color preset)
      Values:
         05: 6500 K
         08: 9300 K
         0b: User 1
   Feature: 16 (Video gain: Red)
   Feature: 18 (Video gain: Green)
   Feature: 1A (Video gain: Blue)
   Feature: 52 (Active control)
   Feature: 60 (Input Source)
      Values:
         11: HDMI-1
         12: HDMI-2
         0f: DisplayPort-1
         10: DisplayPort-2
   Feature: AC (Horizontal frequency)
   Feature: AE (Vertical frequency)
   Feature: B2 (Flat panel sub-pixel layout)
   Feature: B6 (Display technology type)
   Feature: C0 (Display usage time)
   Feature: C6 (Application enable key)
   Feature: C8 (Display controller type)
   Feature: C9 (Display firmware level)
   Feature: D6 (Power mode)
      Values:
         01: DPM: On,  DPMS: Off
         04: DPM: Off, DPMS: Off

我正在尝试提取“Feature：60”值，以便我可以将它们通过管道传输到另一个脚本：

11: HDMI-1
12: HDMI-2
0f: DisplayPort-1
10: DisplayPort-2

有没有一种优雅的方法来做到这一点？我想出了下面的正则表达式，但我认为一定有更好的方法：

$ sudo ddcutil capabilities | pcregrep -M -o2 "(?s)(Feature: 60.*?Values:)(.*?)(Feature)"

如果输出是 json 格式，我可以使用jq，并且我认为有yqyaml，但我无法让它接受它作为 yaml。

答案1

#!/bin/perl
while(<>) {
   if (/Feature: 60/) {
     while(<>) {
       last if (/Feature/);
       next if (/Values/);
       print $_, "\n";
     }
   }
}

简单的 ：）

答案2

使用任何 awk （并cat file代替 来sudo ddcutil capabilities演示答案）：

$ cat file |
  awk '$1=="Feature:"{f=($2 == "60"); next} $1=="Values:"{next} f{$1=$1; print}'
11: HDMI-1
12: HDMI-2
0f: DisplayPort-1
10: DisplayPort-2

请注意，如果您的输入中存在或类似的情况，并且我们使用或类似的部分比较，请使用完整字符串比较$2 == "60"来避免错误匹配。Feature: 607/Feature: 60/

答案3

使用sed

$ sudo ddcutil capabilities | sed -En '/Feature: 60/{n;/Values:/{:a;n;/Feature:/,/Feature:/!s/^[ \t]+//gp;ba}}'
11: HDMI-1
12: HDMI-2
0f: DisplayPort-1
10: DisplayPort-2

答案4

使用awk：

sudo ddcutil capabilities | awk '
    /Feature: 60/{ f=1; next }
    f { if (NF==2) print $1, $2; else if ($1=="Feature:") exit }'

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