bash 为什么 $DISPLAY 有时是 :0 有时是 :1
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Why is $DISPLAY sometimes :0 and sometimes :1
提问by Trong Truong
I'm using xmacro to record keyboard shortcuts, which requires a $DISPLAYto replay on. But, sometimes my $DISPLAYis :0and sometimes :1, so every time that happens I have to change the value manually. Why does it keep changing, and is there a way to set the $DISPLAYvalue to either :0or :1permanently? (I can export DISPLAY=:0in one terminal, but that doesn't change the value of $DISPLAYin new terminals.)
我正在使用 xmacro 记录键盘快捷键，这需要$DISPLAY重播。但是，有时我$DISPLAY是:0有时是:1，所以每次发生这种情况时我都必须手动更改该值。为什么它会不断变化，有没有办法将$DISPLAY值永久设置为:0或:1？（我可以DISPLAY=:0在一个终端中导出，但这不会改变$DISPLAY新终端中的值。）
回答by Aaron Digulla
The number identifies the display ("a collection of monitors that share a keyboard and mouse")
:0is usually the local display (i.e. the main display of the computer when you sit in front of it).
:0通常是本地显示器（即你坐在电脑前的主显示器）。
:1is often used by services like SSH when you enable display forwarding and log into a remote computer.
:1当您启用显示转发并登录到远程计算机时，SSH 等服务通常会使用 SSH。
It can also be modified by startup scripts which try to "fix" it. To find out whether this is happening, run
它也可以通过尝试“修复”它的启动脚本进行修改。要查明是否发生这种情况，请运行
grep DISPLAY ~/.??*
.??*is a trick to get all dot files without ..and .(parent and current folder).
.??*是获取所有没有..和.（父文件夹和当前文件夹）的点文件的技巧。
If that doesn't print anything, check /etc/profile, /etc/bash*and /etc/bash*/*in a similar manner.
如果没有显示任何信息，检查/etc/profile，/etc/bash*并/etc/bash*/*以类似的方式。
I couldn't find a useful manual for xmacro but most X11 application support the option -dor -displayto override $DISPLAY.
我找不到 xmacro 的有用手册，但大多数 X11 应用程序都支持该选项-d或-display覆盖$DISPLAY.
If this doesn't work, create xmacro.shwith this content:
如果这不起作用，请xmacro.sh使用以下内容创建：
#!/bin/bash
export DISPLAY=:0
exec xmacro "$@"
Now invoke the tool with xmacro.shand it should always work.
现在调用该工具，xmacro.sh它应该始终有效。
