This is usually /bin/bash.
BASH_VERSION A number representing the current version of the bash command.
EUID This is the effective user ID number of the current user. It is assigned when the shell
starts, based on the user??™s entry in the /etc/passwd file.
FCEDIT If set, this variable indicates the text editor used by the fc command to edit history
commands. If this variable isn??™t set, the vi command is used.
HISTFILE The location of your history file. It is typically located at $HOME/.bash_history.
HISTFILESIZE The number of history entries that can be stored. After this number is reached, the
oldest commands are discarded. The default value is 1000.
HISTCMD This returns the number of the current command in the history list.
HOME This is your home directory. It is your current working directory each time you log in
or type the cd command with any options.
HOSTTYPE A value that describes the computer architecture on which the Linux system is
running. For Intel-compatible PCs, the value is i386, i486, i586, i686, or something
like i386-linux. For AMD 64-bit machines, the value is x86_64.
MAIL This is the location of your mailbox file. The file is typically your username in the
/var/spool/mail directory.
OLDPWD The directory that was the working directory before you changed to the current
working directory.
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