Category Listing: Linux/Unix
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| Term: | $BASH environment variable |
| ID: | 12439 |
| Source: | Linux Dictionary (v0.16) |
| 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 |
| Source: | Linux Dictionary (v0.16) |
| 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 |
| Source: | Linux Dictionary (v0.16) |
| 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 |
| Source: | Linux Dictionary (v0.16) |
| 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 |
| Source: | Linux Dictionary (v0.16) |
| 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 |
| Source: | Linux Dictionary (v0.16) |
| 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 |
| Source: | Linux Dictionary (v0.16) |
| 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 |
| Source: | Linux Dictionary (v0.16) |
| 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 |
| Source: | Linux Dictionary (v0.16) |
| 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 |
| Source: | Linux Dictionary (v0.16) |
| 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 |
| Source: | Linux Dictionary (v0.16) |
| 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 |
| Source: | Linux Dictionary (v0.16) |
| 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 |
| Source: | Linux Dictionary (v0.16) |
| 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 |
| Source: | Linux Dictionary (v0.16) |
| 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 |
| Source: | Linux Dictionary (v0.16) |
| 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 |
| Source: | Linux Dictionary (v0.16) |
| 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 |
| Source: | Linux Dictionary (v0.16) |
| 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 |
| Source: | Linux Dictionary (v0.16) |
| 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: | |
| ID: | 12457 |
| Source: | Linux Dictionary (v0.16) |
| 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 |
| Source: | Linux Dictionary (v0.16) |
| 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 |
| Source: | Linux Dictionary (v0.16) |
| 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 |
| Source: | Linux Dictionary (v0.16) |
| 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 |
| Source: | Linux Dictionary (v0.16) |
| Date Added: | 07/26/14 |
| Definition: | The previous working directory as set by the cd command. From Rute-Users-Guide |
| Term: | $OSTYPE |
| ID: | 12462 |
| Source: | Linux Dictionary (v0.16) |
| 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 |
| Source: | Linux Dictionary (v0.16) |
| 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 |