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Bash uses certain shell variables in the same way as the Bourne shell.
In some cases, Bash assigns a default value to the variable.
CDPATH
-
A colon-separated list of directories used as a search path for
the
cd builtin command.
HOME
-
The current user's home directory; the default for the
cd builtin
command.
The value of this variable is also used by tilde expansion
(see section Tilde Expansion).
IFS
-
A list of characters that separate fields; used when the shell splits
words as part of expansion.
MAIL
-
If this parameter is set to a filename and the
MAILPATH variable
is not set, Bash informs the user of the arrival of mail in
the specified file.
MAILPATH
-
A colon-separated list of filenames which the shell periodically checks
for new mail.
Each list entry can specify the message that is printed when new mail
arrives in the mail file by separating the file name from the message with
a `?'.
When used in the text of the message,
$_ expands to the name of
the current mail file.
OPTARG
-
The value of the last option argument processed by the
getopts builtin.
OPTIND
-
The index of the last option argument processed by the
getopts builtin.
PATH
-
A colon-separated list of directories in which the shell looks for
commands.
PS1
-
The primary prompt string. The default value is `\s-\v\$ '.
PS2
-
The secondary prompt string. The default value is `> '.
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