我查看了ddcutil detect --verbose的输出，并把结果保存到一个变量中。输出将类似于下面这样：

Invalid display  
I2C bus:  /dev/i2c-9  
...
This monitor does not support DDC/CI. (I2C slave address x37 is unresponsive.)  
If the monitor's on screen display has a DDC/CI setting, check it is enabled.  
Monitor Model Id:  HPN-HP_N246v-13578  
Feature definition file HPN-HP_N246v-13578.mccs not found.  

Display 1    
 I2C bus:  /dev/i2c-6  
...
VCP version:         2.2  
Controller mfg:      Mstar  
Firmware version:    1.0  
Monitor uses invalid feature flag in DDC reply packet to indicate unsupported feature.  
Current dynamic sleep adjustment multiplier:  0.00  
Monitor Model Id:  HPN-HP_N246v-13578  
Feature definition file HPN-HP_N246v-13578.mccs not found.  


Invalid display  
I2C bus:  /dev/i2c-9  
...
This monitor does not support DDC/CI. (I2C slave address x37 is unresponsive.)  
If the monitor's on screen display has a DDC/CI setting, check it is enabled.  
Monitor Model Id:  HPN-HP_N246v-13578  
Feature definition file HPN-HP_N246v-13578.mccs not found.  

Display 2  
I2C bus:  /dev/i2c-7  
...
VCP version:         2.1  
Controller mfg:      Novatek  
Firmware version:    0.65  
Monitor uses invalid feature flag in DDC reply packet to indicate unsupported feature.  
Current dynamic sleep adjustment multiplier:  2.00  
Monitor Model Id:  HPN-HP_24o-13179  
Feature definition file HPN-HP_24o-13179.mccs not found.  

Invalid display  
I2C bus:  /dev/i2c-9  
...
This monitor does not support DDC/CI. (I2C slave address x37 is unresponsive.)  
If the monitor's on screen display has a DDC/CI setting, check it is enabled.  
Monitor Model Id:  HPN-HP_N246v-13578  
Feature definition file HPN-HP_N246v-13578.mccs not found.

我想删除位于 "Invalid display" 与下一个空行之间的字符串，如下所示：

Display 1  
I2C bus:  /dev/i2c-6  
...
VCP version:         2.2  
Controller mfg:      Mstar  
Firmware version:    1.0  
Monitor uses invalid feature flag in DDC reply packet to indicate unsupported feature.  
Current dynamic sleep adjustment multiplier:  0.00  
Monitor Model Id:  HPN-HP_N246v-13578  
Feature definition file HPN-HP_N246v-13578.mccs not found.  

Display 2  
I2C bus:  /dev/i2c-7  
...
VCP version:         2.1  
Controller mfg:      Novatek  
Firmware version:    0.65  
Monitor uses invalid feature flag in DDC reply packet to indicate unsupported feature.  
Current dynamic sleep adjustment multiplier:  2.00  
Monitor Model Id:  HPN-HP_24o-13179  
Feature definition file HPN-HP_24o-13179.mccs not found.

我尝试了 sed，但没有成功。有人能指点一下方向吗？非常感谢！

解决方案

您可以使用 d 命令，其中起始使用与 Invalid display 匹配的范围地址，结束处以一个空行为止：

sed '/Invalid display/,/^$/d' <<<"$variable"