BASH_ENV absolute path of startup file
CDPATH directories searched by cd
FCEDIT absolute path of history editor
HISTCMD the history number of the current command
HISFILE absolute path of history file
HISTSIZE number of remembered commands
HOME login directory
IFS token delimiters
LINENO current line number in shell script
LINES terminal height
MAIL absolute path of mailbox
MAILCHECK number of seconds to check mail
OLDPWD absolute path of previous directory
OPTARG option set by getopt
OPTIND option's ordinal position set by getopt
OSTYPE the OS on which bash is executing
PATH command search path
PPID process ID of parent
PS1 primary prompt
PS2 secondary prompt
PWD absolute path of current directory
RANDOM random integer
REPLY default variable for read
SECONDS number of seconds since shell started
SHELL absolute pathname of preferred shell
TMOUT seconds to log out after lack of use
UID user ID of the current user
$ process ID of current shell
? Exit status of previous command
# 參數的數目
* 代表所有參數
! PID of the most recently started backgroup job
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