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Unix programming reference

Please explain me:

$ cd /usr/local/bin

changes to directory /usr/local/bin

.

then to change to a directory /usr/home/amrood

from the current directory use the relative path:

$ cd ../../home/amrood

(these are double dots in a relative path, I don't understand)

amuses

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3 answers


Double dots in a unix file link mean "go up one directory". Therefore, if you are in /usr/local/bin

, ../..

it is that you are basically removing bin

and local

from your current path. (You move "up" two folders.) Then home

and are added amrood

, so you are in /usr/home/amrood

.



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You are viewing one node of the tree with each one ..

. First /usr/local

, then /usr

). So you're in the directory usr

, which means you can go to home/amrood

. To shorten this, you can do ../../home/amrood

.



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From, /usr/local/bin

you can use an absolute path:

$ cd /usr/home/amrood

Or a relative path:

$ cd ../../home/amrood

But no /usr/home/user

. To get into the user's current directory, you must use the shortcut ~

:

$ cd ~
$ pwd    # /home/user

The double dot means "go to the parent directory".

So, for example, from the user's starting point:

$ pwd     # /home/user
$ cd ..
$ pwd     # /home
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