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Source Listing: Linux Dictionary (v0.16)

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Term: $BASH environment variable
ID: 12439
Category: Linux/Unix
Date Added: 07/26/14
Definition: Expands to the full pathname used to invoke this instance of bash. From Rute-Users-Guide

Term: $BASH_VERSION environment variable
ID: 12440
Category: Linux/Unix
Date Added: 07/26/14
Definition: Expands to the version number of this instance of bash. From Rute-Users-Guide

Term: $CDPATH environment variable
ID: 12441
Category: Linux/Unix
Date Added: 07/26/14
Definition: The search path for the cd command. This is a colon-separated list of directories in which the shell looks for destination directories specified by the cd command. A sample value is ``.:~:/usr''. From Rute-Users-Guide

Term: $ENV environment variable
ID: 12442
Category: Linux/Unix
Date Added: 07/26/14
Definition: If this parameter is set when bash is executing a shell script, its value is interpreted as a filename containing commands to initialize the shell, as in .bashrc. The value of ENV is subjected to parameter expansion, command substitution, and arithmetic expansion before being interpreted as a pathname. PATH is not used to search for the resultant pathname. From Rute-Users-Guide

Term: $FIGNORE environment variable
ID: 12443
Category: Linux/Unix
Date Added: 07/26/14
Definition: A colon-separated list of suffixes to ignore when performing filename completion (see READLINE below). A filename whose suffix matches one of the entries in FIGNORE is excluded from the list of matched filenames. A sample value is ``.o:~''. From Rute-Users-Guide

Term: $HISTCMD environment variable
ID: 12444
Category: Linux/Unix
Date Added: 07/26/14
Definition: The history number, or index in the history list, of the current command. If HISTCMD is unset, it loses its special properties, even if it is subsequently reset. From Rute-Users-Guide

Term: $HISTCONTROL environment variable
ID: 12445
Category: Linux/Unix
Date Added: 07/26/14
Definition: If set to a value of ignorespace, lines which begin with a space character are not entered on the history list. If set to a value of ignoredups, lines matching the last history line are not entered. A value of ignoreboth combines the two options. If unset, or if set to any other value than those above, all lines read by the parser are saved on the history list. From Rute-Users-Guide

Term: $HISTFILE environment variable
ID: 12446
Category: Linux/Unix
Date Added: 07/26/14
Definition: The name of the file in which command history is saved. (See HISTORY below.) The default value is ~/.bash_history. If unset, the command history is not saved when an interactive shell exits. From Rute-Users-Guide

Term: $HISTFILESIZE environment variable
ID: 12447
Category: Linux/Unix
Date Added: 07/26/14
Definition: The maximum number of lines contained in the history file. When this variable is assigned a value, the history file is truncated, if necessary, to contain no more than that number of lines. The default value is 500. From Rute-Users-Guide

Term: $HISTSIZE environment variable
ID: 12448
Category: Linux/Unix
Date Added: 07/26/14
Definition: The number of commands to remember in the command history (see HISTORY below). The default value is 500. From Rute-Users-Guide

Term: $HOME environment variable
ID: 12449
Category: Linux/Unix
Date Added: 07/26/14
Definition: The home directory of the current user; the default argument for the cd builtin command. From Rute-Users-Guide

Term: $HOSTFILE
ID: 12450
Category: Linux/Unix
Date Added: 07/26/14
Definition: Contains the name of a file in the same format as /etc/hosts that should be read when the shell needs to complete a hostname. The file may be changed interactively; the next time hostname completion is attempted bash adds the contents of the new file to the already existing database. From Rute-Users-Guide

Term: $HOSTTYPE
ID: 12451
Category: Linux/Unix
Date Added: 07/26/14
Definition: Automatically set to a string that uniquely describes the type of machine on which bash is executing. The default is system-dependent. From Rute-Users-Guide

Term: $IFS
ID: 12452
Category: Linux/Unix
Date Added: 07/26/14
Definition: In UNIX, the $IFS variable separates commands. It is usually conigured to be the semicolon (;) and newline characters. However, it can be reconfigured to be other characters as well. Data-driven attacks will sometimes seek to reset the IFS variable (e.g. IFS=x), then cause execution within the data field wihtout having to insert shell metacharacters. Tidbit: On Linux, the $FF variable may also be used like $IFS. From Hacking-Lexicon

Term: $IFS
ID: 12453
Category: Linux/Unix
Date Added: 07/26/14
Definition: The Internal Field Separator that is used for word splitting after expansion and to split lines into words with the read builtin command. The default value is ``<space><tab><newline>''. From Rute-Users-Guide

Term: $IGNOREEOF
ID: 12454
Category: Linux/Unix
Date Added: 07/26/14
Definition: Controls the action of the shell on receipt of an EOF character as the sole input. If set, the value is the number of consecutive EOF characters typed as the first characters on an input line before bash exits. If the variable exists but does not have a numeric value, or has no value, the default value is 10. If it does not exist, EOF signifies the end of input to the shell. This is only in effect for interactive shells. From Rute-Users-Guide

Term: $INPUTRC environment variable
ID: 12455
Category: Linux/Unix
Date Added: 07/26/14
Definition: The filename for the readline startup file, overriding the default of ~/.inputrc (see READLINE below). From Rute-Users-Guide

Term: $LINENO
ID: 12456
Category: Linux/Unix
Date Added: 07/26/14
Definition: Each time this parameter is referenced, the shell substitutes a decimal number representing the current sequential line number (starting with 1) within a script or function. When not in a script or function, the value substituted is not guaranteed to be meaningful. When in a function, the value is not the number of the source line that the command appears on (that information has been lost by the time the function is executed), but is an approximation of the number of simple commands executed in the current function. If LINENO is unset, it loses its special properties, even if it is subsequently reset. From Rute-Users-Guide

Term: $MAIL
ID: 12457
Category: Linux/Unix
Date Added: 07/26/14
Definition: 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. From Rute-Users-Guide

Term: $MAILCHECK
ID: 12458
Category: Linux/Unix
Date Added: 07/26/14
Definition: Specifies how often (in seconds) bash checks for mail. The default is 60 seconds. When it is time to check for mail, the shell does so before prompting. If this variable is unset, the shell disables mail checking. From Rute-Users-Guide

Term: $MAILPATH
ID: 12459
Category: Linux/Unix
Date Added: 07/26/14
Definition: A colon-separated list of pathnames to be checked for mail. The message to be printed may be specified by separating the pathname from the message with a `?'. $_ stands for the name of the current mailfile. Example: MAILPATH='/usr/spool/mail/bfox?You have mail:~/shell-mail?$_ has mail!' Bash supplies a default value for this variable, but the location of the user mail files that it uses is system dependent (e.g., /usr/spool/mail/$USER). From Rute-Users-Guide

Term: $MAIL_WARNING
ID: 12460
Category: Linux/Unix
Date Added: 07/26/14
Definition: If set, and a file that bash is checking for mail has been accessed since the last time it was checked, the message ``The mail in mailfile has been read'' is printed. From Rute-Users-Guide

Term: $OLDPWD
ID: 12461
Category: Linux/Unix
Date Added: 07/26/14
Definition: The previous working directory as set by the cd command. From Rute-Users-Guide

Term: $OSTYPE
ID: 12462
Category: Linux/Unix
Date Added: 07/26/14
Definition: Automatically set to a string that describes the operating system on which bash is executing. The default is system-dependent. From Rute-Users-Guide

Term: $PATH
ID: 12463
Category: Linux/Unix
Date Added: 07/26/14
Definition: The search path for commands. It is a colon-separated list of directories in which the shell looks for commands (see COMMAND EXECUTION below). The default path is system-dependent, and is set by the administrator who installs bash. A common value is ``/usr/gnu/bin:/usr/local/bin:/usr/ucb:/bin:/usr/bin:.''. From Rute-Users-Guide

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