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| 2 |   Special Variables <a class="group-link" href="chap-special-var.html">special-var</a>
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| 3 | 
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| 4 | 
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| 5 |   [POSIX Special] $@  $*  $#     $?  $-     $$  $!   $0  $9
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| 6 |   [Shell Vars]    IFS             X LANG       X GLOBIGNORE
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| 7 |   [Shell Options] SHELLOPTS       X BASHOPTS
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| 8 |   [Other Env]     HOME              PATH
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| 9 |   [Other Special] BASH_REMATCH     @PIPESTATUS
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| 10 |   [Platform]      HOSTNAME          OSTYPE
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| 11 |   [Call Stack]    @BASH_SOURCE     @FUNCNAME    @BASH_LINENO   
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| 12 |                 X @BASH_ARGV     X @BASH_ARGC
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| 13 |   [Tracing]       LINENO
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| 14 |   [Process State] UID               EUID         PPID       X BASHPID
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| 15 | X [Process Stack] BASH_SUBSHELL     SHLVL
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| 16 | X [Shell State]   BASH_CMDS        @DIRSTACK
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| 17 |   [Completion]   @COMP_WORDS        COMP_CWORD    COMP_LINE   COMP_POINT
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| 18 |                   COMP_WORDBREAKS  @COMPREPLY   X COMP_KEY
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| 19 |                 X COMP_TYPE         COMP_ARGV
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| 20 |   [History]       HISTFILE
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| 21 |   [cd]            PWD               OLDPWD      X CDPATH
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| 22 |   [getopts]       OPTIND            OPTARG      X OPTERR
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| 23 |   [read]          REPLY
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| 24 |   [Functions]   X RANDOM            SECONDS
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