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grep yum 命令输出中以 - 或加号开头的行

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grep yum 命令输出中以 - 或加号开头的行

我正在运行 yum 查询

 yum group info 'X Window System'

输出如下

yum group info 'X Window System'
Loaded plugins: fastestmirror, langpacks
Loading mirror speeds from cached hostfile
* base: mirror.vanehost.com
* extras: mirror.vanehost.com
* updates: mirror.vanehost.com

 Group: X Window System
 Group-Id: x11
 Description: X Window System Support.
 Mandatory Packages:
 -glx-utils
 -initial-setup-gui
 =mesa-dri-drivers
 =plymouth-system-theme
 =spice-vdagent
 +xorg-x11-drivers
 =xorg-x11-server-Xorg
 =xorg-x11-utils
 =xorg-x11-xauth
 =xorg-x11-xinit
 =xvattr
 Optional Packages:
mesa-libGLES
 tigervnc-server
 wayland-protocols-devel
 xorg-x11-drv-evdev
 xorg-x11-drv-keyboard
 xorg-x11-drv-libinput
 xorg-x11-drv-mouse
 xorg-x11-drv-openchrome

但是当我对此运行 grep 来过滤掉以 - 或 + 开头的行时

yum group info 'X Window System' | grep -E "^[-+]"

我得到一个空白输出。有人可以让我知道我哪里出了问题吗？

答案1

这些行不以+或开头-，而是以空格开头。尝试

grep -E "^[[:blank:]]*[-+]"

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