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Chapter 7
kali >
export PS1='C:\w> 'Bog'liq linuxbasicsforhackers76
Chapter 7
kali >
export PS1='C:\w> '
kali >
cd /tmp
C:/tmp>
Listing 7-2: Changing the prompt and showing the current directory
Having your prompt show your current directory can be generally
useful, particularly to a beginner, so it’s something to consider when you
change your
PS1
variable.
Changing Your PATH
One of the most important variables in your environment is your
PATH
vari-
able, which controls where on your system your shell will look for commands
you enter, such as
grep
,
ls
, and
echo
. Most commands are located in the sbin
or bin subdirectory, like /usr/local/sbin or /usr/local/bin. If the bash shell
doesn’t find the command in one of the directories in your
PATH
variable, it
will return the error
command not found
, even if that command does exist in a
directory not in your
PATH
.
You can find out which directories are stored in your
PATH
variable by
using
echo
on its contents, like so:
kali >
echo $PATH
/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin
These are the directories where your terminal will search for any com-
mand. When you enter
ls
, for example, the system knows to look in each
of these directories for the
ls
command, and when it finds
ls
, the system
executes it.
Each directory is separated by a colon (
:
). Don’t forget to add the
$
content symbol to
PATH
. When we put a
$
before a variable, we are asking the
system for the content of the variable.
Adding to the PATH Variable
You can probably see why it’s important to know what is in your PATH vari-
able: if you downloaded and installed a new tool—let’s say
newhackingtool
—
into the /root/newhackingtool directory, you could only use commands from
that tool when you’re in that directory because that directory is not in the
PATH
variable. Every time you wanted to use that tool, you would first have to
navigate to /root/newhackingtool, which is a bit inconvenient if you want to
use the tool often.
To be able to use this new tool from any directory, you need to add the
directory holding this tool to your
PATH
variable.
To add newhackingtool to your
PATH
variable, enter the following:
kali >
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