Hack and / - Lightning Hacks—the Command Next Door

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Even old commands (and old sysadmins) can learn new tricks.
Hear Your Pings

The problem with powerful server hardware is that it always takes a little time to reboot. Often when I have to reboot a server, I want to know the moment it comes back up, because I want to log back in and finish some work. Usually when I reboot a machine, I start a ping process, so I can watch to see when it is available. The problem is that servers seem to take just long enough to come back up that I end up getting distracted in another window on my desktop and don't see the ping replies. My solution to this is to make ping audible:

$ ping -a 10.0.1.7

When you pass the -a command to ping, it generates an audible bell for every ping reply. I get to hear a few system beeps as the server goes down, and then I hear only silence. If I do become distracted and the server comes back, I immediately start hearing this annoying system beep in my ear and know the server is ready.

Kyle Rankin is a Systems Architect in the San Francisco Bay Area and the author of a number of books, including The Official Ubuntu Server Book, Knoppix Hacks and Ubuntu Hacks. He is currently the president of the North Bay Linux Users' Group.

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Kyle Rankin is a director of engineering operations in the San Francisco Bay Area, the author of a number of books including DevOps Troubleshooting and The Official Ubuntu Server Book, and is a columnist for Linux Journal.

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ps -ef | grep -v blah etc...

Yves@sollerS's picture

This, is why pgrep was written:

$ pgrep -fl cron

great tricks

ben's picture

Im passing this around at the office tomorrow. These are key areas I deal with every day.