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There's two things to remember:
Commands, including scripts, keep their environment for the duration of the command running
Commands inherit environment from...
I've had the same problem within virtual! Ubuntu client too. Sometime ubuntu fix the connection suddenly or it works fine if i change the network connection from virtual network connettion...
$-
means 'current flags'.echo $-
returns "himBH". Those are all defaults. && return
actually does what it says...
You need to enter these lines in a Terminal, which you can open by pressing CtrlAltT.
You can also paste them with...
With Character Map, you can select a large range of non-standard and international characters (including math symbol which you need) to put in your...