1) Print the contents of the PATH environment variable.
$ echo $PATH
$ echo $PATH | tr ':' '\n' # translates colons to newlines
2) What files exist in some of the directories found in the PATH environment variable?
$ ls -l /bin # try some of these
$ ls -l /usr/bin
$ ls -l /usr/local/bin
$ ls -l /opt/apps/tacc/bin
3) Find an environment variable that stores your username.
$ env | grep "train332"
4) Store Webster’s dictionary in an environment variable called DICTIONARY.
$ echo $DICTIONARY # nothing here yet
$ export DICTIONARY="$HOME/IntroToLinuxHPC/Lab01/websters.txt"
$ echo $DICTIONARY
/home1/0003/train332/IntroToLinuxHPC/Lab01/websters.txt
$ head $DICTIONARY
A
a
aa
aal
...