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REPLY
- The default variable for the
read builtin.
RANDOM
- Each time this parameter is referenced, a random integer
is generated. Assigning a value to this variable seeds
the random number generator.
SECONDS
- This variable expands to the number of seconds since the
shell was started. Assignment to this variable resets
the count to the value assigned, and the expanded value
becomes the value assigned plus the number of seconds
since the assignment.
PS3
- The value of this variable is used as the prompt for the
select command.
PS4
- This is the prompt printed before the command line is echoed
when the
-x option is set (see section The Set Builtin).
PWD
- The current working directory as set by the
cd builtin.
OLDPWD
- The previous working directory as set by the
cd builtin.
TMOUT
- If set to a value greater than zero, the value is interpreted as
the number of seconds to wait for input after issuing the primary
prompt.
Bash terminates after that number of seconds if input does
not arrive.
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