Exploring Linux Filesystems

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~ metacharacter

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a metacharacter used to represent a users home directory

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absolute pathname

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the full pathname to a certain file or directory, starting from the root directory.

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binary data file

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a file that contains machine language (1 0) and stores information (such as common functions and graphics) used by binary complied programs.

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cat COMMAND

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a linux command used to display the entire contents of a text file to the screen.

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cd COMMAND

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a Linux command used to change the current directory in the directory tree.

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command mode

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one of the two modes in vi; it allows users to perform any available text editing task that is not related to inserting text into the document.

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directory

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a special file on the file system used to organize other files into a logical tree structure.

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egrep COMMAND

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a variant of the grep command, used to search file patterns using extended regular expressions.

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Emacs (editor MACroS) editor

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a popular and widespread text editor more conducive to word processing than vi. Developed by Richard Stallman.

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executable programs

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a file that can be executed by the linux operating system to run in memory as a process and perform a useful function.

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fgrep COMMAND

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a variant of the grep command that does not allow the use of regular expression.

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file COMMAND

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a linux command that displays the file type of a pacific filename.

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filename

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the user friendly identifier given to a file.

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filename extension

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at the end of a filename, a dot followed by a series of identifiers that denote the file type; the file name extension .txt denotes a text file.

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gedit editor

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a common text editor used within GUI environments.

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grep COMMAND

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a linux command that searches files for patterns of characters using regular expression metacharacters. Short for "global regular expression print".

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head COMMAND

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a linux command that displays the first set of lines of a text file.

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home directory

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a directory on the filesystem set aside for users to store personal files and information.

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insert mode

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one of the two modes in vi; it allows users to insert text into document but does not allow any other functionality.

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lass COMMAND

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a linux command used to display a text file page by page on the terminal screen.

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linked file

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the file that represents the same data as other files.

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ll COMMAND

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an alias for the ls -l command; it give a long file listing.

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log file

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a file that contains past system events

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ls COMMAND

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a linux command used to list the files in a given directory

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more COMMAND

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a linux command used to display a text file page by page and line by line on the terminal screen.

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named pipe file

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a temporary copnnection that sends information from one command or process in memory to another.

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nano editor

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a user friendly terminal text editor that uses Ctrl key combinations to perform basic functions.

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od COMMAND

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a linux command used to display the content of a local file in octal format.

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parent directory

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the directory that is one level closer to the root directory in the directory tree relative to your current directory.

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pwd COMMAND

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a linux command used to display the current directory in the directory tree.

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regular expressions

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the special metacharacters used to match patterns of text with text files.

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relative pathnames

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the pathname of a target directory relative to your current directory in the tree.

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socket file

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a named pipe connecting proccesses on two different computers

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special device file

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a file used to identify hardware devices such as hard disk and serial ports.

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string COMMAND

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a linux command used to search for and display text characters in a binary file.

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subdirectory

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a directory that resides within another directory in the directory tree.

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tab-completion feature

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a feature of the BASH shell that fills in the remaining characters of a unique filename or directory name.

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tac COMMAND

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a linux command that displays a file on the screen, beginning with the last line of the file and ending with the first line of the file.

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tail COMMAND

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a linux command used to display lines of text at the end of a file.

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text file

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a file that stores information in a readable text format.

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text tool

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the program that allows for the creation, modification, and searching of text files.

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vi editor

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a powerful-command line text editor available to most UNIX and LINUX systems

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wildcard metacharacters

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the metacharacters used to match certain characters in a file or directory.