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Here is a list of useful commands that I came up with by looking at my 'history' file. I would not be happy to use a computer platform that didn't support them:
So, there you are the most useful command line tools in the world ever!
du /var/ -h --max-depth=1 lists the size of all subfolders in a specified folder.
First, I can't believe "grep" didn't make this list, and second, I do believe that 'ifdown,ifup,iwconfig,dhclient,iwlist' are all different commands not to be used interchangeably - meaning this list is more like 15 than 11.
If you're on Debian, the first command I suggest is `info coreutils` which will show a quick index of the basic GNU commands, along with `apropos`, and the package manager commands to get what you don't have (apt-*). To speak of a list like this is pretty silly, imho.
Networking commands are often deferred to a gui-config applet - I highly disagree with putting those on the list. And, it certainly isn't one of the "most useful" when you only have to use it a few times.. How often do you have to check dmesg? Also certainly not one of the most useful.
I often use manual page like: man ls, or man -k blabla (behave like apropos command). I think you should add man command in your list.
Sry but i beg to differ. rsync > scp htop > top cd - sudo !!(bang bang)
For serious users, xargs and strace are at the top. lots of other commands more powerful and strace is excellent for troubleshooting.
To go with df -h you have to have du -hs . or du -hs * so you can see the size of the current directory and the files and directories in the current directory respectively. An awesome list I use almost everyone of them daily.
Apache does not need to be run as root, hence the standard www or www-data user :P It's a bit of a security risk to run as root.