带有export命令的shell脚本和通过crontab的notify-send不工作。导出的变量由命令设置 [英] Shell script with export command and notify-send via crontab not working. Exported variable is set by a command

问题描述

我想通过cron执行的shell脚本向gnome桌面发送通知气泡。

为了能够与桌面通信环境 DBUS_SESSION_BUS_ADDRESS env变量需要在脚本中设置。我试图通过下面的代码实现这一点不工作。

 ＃！/ usr / bin / env sh 
 export DISPLAY =：0 
 dbus = $（env | grep DBUS_SESSION_BUS_ADDRESS | sed'/ DBUS_SESSION_BUS_ADDRESS = //'）
 export DBUS_SESSION_BUS_ADDRESS = $ dbus 
 [...] 
 notify-send -u criticalBlahBlubb
  

  export DBUS_SESSION_BUS_ADDRESS ='unix：abstract = / tmp / dbus-HjnsLUTTrn，guid = 17c8962443279ebbe24dcd66536278dd'
  
我做错了什么？
解决方案
  env 从 cron 运行的脚本只在我的框中设置了以下变量。
  SHELL = / bin / sh USER = clement PATH = / usr / bin：/ bin PWD = / home / clement HOME = / home / clement SHLVL = 2 LOGNAME = clement _ = / usr / bin / env 
  
，因此 grep  
 $ b 
  $（env | grep DBUS_SESSION_BUS_ADDRESS | sed's / DBUS_SESSION_BUS_ADDRESS = //'）
  
没有给出任何输出。以下内容应该有效。
 ＃！/ bin / bash 
 PID = $（pgrep gnome-session）
 dbus = $（grep -z DBUS_SESSION_BUS_ADDRESS / proc / $ PID / environ | cut -d = -f2-）
 export DBUS_SESSION_BUS_ADDRESS = $ dbus 
 notify-send -u criticalBlahBlubb 
  
 
I'd like to send a notification bubble to the gnome desktop from a shell script that is executed by cron.

To make it able to communicate with the desktop environment DBUS_SESSION_BUS_ADDRESS env variable needs to be set within the script. I'm trying to achieve this by the following code which isn't working.
#!/usr/bin/env sh
export DISPLAY=:0
dbus=$(env | grep DBUS_SESSION_BUS_ADDRESS | sed 's/DBUS_SESSION_BUS_ADDRESS=//')
export DBUS_SESSION_BUS_ADDRESS=$dbus
[...]
notify-send -u critical "Blah" "Blubb"
When hardcoded it works fine
export DBUS_SESSION_BUS_ADDRESS='unix:abstract=/tmp/dbus-HjnsLUTTrn,guid=17c8962443279ebbe24dcd66536278dd'
Problem is, the dbus session address changes so hardcoding isn't an option.

What am I doing wrong?
解决方案
env when invoked from a script run by cron, only had the following variables set in my box.
SHELL=/bin/sh USER=clement PATH=/usr/bin:/bin PWD=/home/clement HOME=/home/clement SHLVL=2 LOGNAME=clement _=/usr/bin/env
and so grep in 
$(env | grep DBUS_SESSION_BUS_ADDRESS | sed 's/DBUS_SESSION_BUS_ADDRESS=//')
didn't give any output. The following should work.
#!/bin/bash
PID=$(pgrep gnome-session)
dbus=$(grep -z DBUS_SESSION_BUS_ADDRESS /proc/$PID/environ|cut -d= -f2-)
export DBUS_SESSION_BUS_ADDRESS=$dbus
notify-send -u critical "Blah" "Blubb"


                        
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