<div>
The script inherits the variables from the environment, you are setting the TESTING variable in the bash profile.<br />
<br />
In the script you can use variables by using $VARIABLE_NAME or ${VARIABLE_NAME} in your case $TESTING or ${TESTING}<br />
<br />
By doing: cd $TESTING/penguins in the script it is in fact doing: cd /home/programming/penguins<wbr /><br />
<br />
So looks OK to me ;)
</div>


The script inherits the variables from the environment, you are setting the TESTING variable in the bash profile.

In the script you can use variables by using $VARIABLE_NAME or ${VARIABLE_NAME} in your case $TESTING or ${TESTING}

By doing: cd $TESTING/penguins in the script it is in fact doing: cd /home/programming/penguins

So looks OK to me ;)

<div>
in my case, i am using the script to make sure they can only type in certain commands. Otherwise, i agree, it would be dangerous.
</div>


in my case, i am using the script to make sure they can only type in certain commands. Otherwise, i agree, it would be dangerous.

<div>
<div class="content wysiwyg-content">
in a bash script, the user keys in a command with arguments<br />
some of the arguments are variables defined in the bash profile<br />
i need to run the command they enter<br />
How does the script get the information and then does the whole command?<br />
<br />
in the bash profile<br />
&nbsp; export TESTING=/home/programming<br />
<br />
in the script, the user keys in: cd $TESTING/penguins<br />
<br />
the script needs to: cd /home/programming/penguins<wbr /><br />
<br />
I am running RedHat EL 6.4
</div>
</div>


in a bash script, the user keys in a command with arguments
some of the arguments are variables defined in the bash profile
i need to run the command they enter
How does the script get the information and then does the whole command?

in the bash profile
  export TESTING=/home/programming

in the script, the user keys in: cd $TESTING/penguins

the script needs to: cd /home/programming/penguins

I am running RedHat EL 6.4

bash script to expand variables

Linux is a UNIX-like open source operating system with hundreds of distinct distributions, including: Fedora, openSUSE, Ubuntu, Debian, Slackware, Gentoo, CentOS, and Arch Linux. Linux is generally associated with web and database servers, but has become popular in many niche industries and applications.

Linux

A Linux distribution is an operating system made as a software collection based on the Linux kernel and, often, on a package management system and are available for a variety of systems. A typical Linux distribution comprises a Linux kernel, GNU tools and libraries, additional software, documentation, a window system (the most common being the X Window System), a window manager, and a desktop environment. Most Linux systems are open-source software made available both as compiled binaries and in source code form, allowing modifications to the original software. Over three hundred distributions are in active development, including commercially backed distributions (such as Fedora, openSUSE and Ubuntu) and community-driven distributions (such as Debian, Slackware, Gentoo and Arch Linux).