Shell – the extended version of the “sl” command

commandshell

Recently I've been discussing Unix humor with a friend and we got to the topic of the sl command. I got the sources, compiled, installed on our development machine, and… got rather disappointed. The "official version" shows just the engine, with option to expand it to two cars.

I remember a version from a machine I had a couple years ago, that had a road crossing with barriers, a very long train, and dozens of options.

Where can I find that extended version?

Best Answer

When I installed sl in my ubuntu box (apt-get install sl) I got the binary /usr/games/sl-h too. This is the version you are looking for. You can probably get the sources from the ubuntu packages pages (take a look here: http://nl.archive.ubuntu.com/ubuntu/pool/universe/s/sl/ ).

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Shell – the purpose of -e in sed command

From the man page:

-e script, --expression=script

    add the script to the commands to be executed

So you can use multiple -e options to build up a script out of many parts.

$ sed -e "s/foo/bar/" -e "/FOO/d"

Would first replace foo with bar and then delete every line containing FOO.

The point of the “yes” command

yes can be used to send an affirmative (or negative; e.g. yes n) response to any command that would otherwise request one, thereby causing the command to run non-interactively.

The yes command in conjunction with the head command can be used to generate large volume files for means of testing.

It can also be used to test how well a system handles high loads, as using yes results in 100% processor usage, for systems with a single processor (for a multiprocessor system, a process must be run for each processor). This, for example, can be useful for investigating whether a system's cooling system will be effective when the processor is running at 100%.

In 2006, the yes command received publicity for being a means to test whether or not a user's MacBook is affected by the Intermittent Shutdown Syndrome. By running the yes command twice via Terminal under Mac OS X, users were able to max out their computer's CPU, and thus see if the failure was heat related

via wikipedia: http://en.wikipedia.org/wiki/Yes_(Unix)

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