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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.
IFS
- A list of characters that separate fields; used when the shell splits
words as part of expansion.
PATH
- A colon-separated list of directories in which the shell looks for
commands.
HOME
- The current user's home directory.
CDPATH
- A colon-separated list of directories used as a search path for
the
cd command.
MAILPATH
- A colon-separated list of files which the shell periodically checks
for new mail. You can
also specify what message is printed by separating the file name from
the message with a `?'. When used in the text of the message,
$_ stands for the name of the current mailfile.
PS1
- The primary prompt string.
PS2
- The secondary prompt string.
OPTIND
- The index of the last option processed by the
getopts builtin.
OPTARG
- The value of the last option argument processed by the
getopts builtin.
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