Or you can launch it to all users on a given computer if you don't know the username. Enable verbose mode (/V) and wait for a callback (/W) to get a callback when the user closes it:
msg * /V /W /SERVER:WKST-123 This is a test message
Restart Remote Machine (With Warning)
This script is better kept out in a public place and called with the a remote command utility to loop through a list of hostnames. You can just replace the %1 to hardcode a host if you want though.
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@echo off
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REM shutdown -m \\%1 /a
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echo Start Checking %1
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ping -n 1 -l 100 %1
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IF %ERRORLEVEL%==1 GOTO BAD
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shutdown -r -f -m \\%1 -t 300 -d up:125:1 -c "Please SAVE Your work. In 5 minutes, this machine will reboot for a policy updates (Msg time: %time%)"
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GOTO GOOD
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:BAD
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ECHO %1,Failed,%date%,%time% >> BadPCs.txt
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GOTO EXIT
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:GOOD
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ECHO %1,Good,%date%,%time% >> GoodPCs.txt
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GOTO EXIT
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:EXIT
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echo Stop Checking %1
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Comment / Uncomment Lines
When you need to comment out or uncomment out a line, sed makes it pretty easy. Just change the word pattern to something identifiable:
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sed -i '/pattern/s/^/#/g' apache2.conf # comment
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sed -i '/pattern/s/^#//g' apache2.conf # uncomment