174 lines
8.1 KiB
EmacsLisp
174 lines
8.1 KiB
EmacsLisp
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;;; bundle--linux.el --- A bundle of useful Linux information
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;;; Commentary:
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;; This file contains a variety of Emacs Lisp functions that provide
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;; helpful descriptions for Linux directories, commands, and options.
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;;; Code:
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(defvar linux-filesystem-alist
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'(( "/" . "Root directory, the base of the filesystem hierarchy")
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("/bin" . "Essential command binaries, needed for booting")
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("/boot" . "Bootloader files, kernel, and other files needed during booting")
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("/dev" . "Device files representing hardware components")
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("/etc" . "System-wide configuration files")
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("/home" . "User home directories")
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("/lib" . "Shared libraries and kernel modules")
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("/media" . "Mount points for removable media like CDs and USBs")
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("/mnt" . "Temporary mount points for filesystems")
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("/opt" . "Optional application software packages")
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("/proc" . "Virtual filesystem providing info about processes and system")
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("/root" . "Home directory for the root user")
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("/sbin" . "Essential system binaries, usually for the root user")
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("/srv" . "Data directories for services like HTTP, FTP, etc.")
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("/sys" . "Virtual filesystem for kernel objects")
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("/tmp" . "Temporary files, cleared on reboot")
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("/usr" . "User binaries, documentation, libraries, etc.")
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("/var" . "Variable files like logs, databases, etc."))
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"Alist mapping Linux directories to their descriptions.")
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(defun describe-linux-directory (dirname)
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"Describe the purpose of a Linux directory.
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Takes DIRNAME as an argument and prints its description."
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(interactive "sEnter Linux directory name (e.g., /bin): ")
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(let ((description (assoc-default dirname linux-filesystem-alist)))
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(if description
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(message "%s: %s" dirname description)
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(message "Unknown directory: %s" dirname))))
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(defvar bash-regex-alist
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'(("empty line" . "^$")
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("backslash" . "\\\\")
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("line starts with a dot" . "^\\.")
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("line ends with a dot" . "\\.$")
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("line starts with a dollar sign" . "^\\$")
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("line starts with a caret" . "^\\^")
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("left square bracket" . "\\[")
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("right square bracket" . "\\]")
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("entire line" . "^.*$")
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("any alphanumeric character" . "[a-zA-Z0-9]")
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("IP Address" . "\\b(?:[0-9]{1,3}\\.){3}[0-9]{1,3}\\b")
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("email" . "[a-zA-Z0-9._%+-]+@[a-zA-Z0-9.-]+\\.[a-zA-Z]{2,}")
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("hex color code" . "#[a-fA-F0-9]{6}")
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("date in yyyy-mm-dd" . "\\b\\d{4}-\\d{2}-\\d{2}\\b")
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("time in hh:mm:ss" . "\\b\\d{2}:\\d{2}:\\d{2}\\b")
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("words without vowels" . "\\b[^aeiou\s]+\\b"))
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"Alist mapping Bash regular expressions to their descriptions.")
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(defun describe-bash-regex (regex)
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"Describe the purpose of a Bash regular expression.
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Takes REGEX as an argument and prints its description."
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(interactive "sEnter Bash regex (e.g., empty line): ")
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(let ((description (assoc-default regex bash-regex-alist)))
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(if description
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(message "%s: %s" regex description)
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(message "Unknown regular expression: %s" regex))))
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(defvar linux-process-commands-alist
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'(("ps" . "Shows a snapshot of the current processes")
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("top" . "Displays dynamic real-time view of system stats and processes")
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("htop" . "An interactive process viewer, similar to top but more feature-rich")
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("pgrep" . "Looks up processes based on name and other attributes")
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("pstree" . "Displays the process tree in a tree-like diagram")
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("ps -e" . "Lists all the processes running on the system")
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("ps aux" . "Displays detailed information about all processes")
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("kill" . "Terminates processes by sending signals")
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("killall" . "Kills all processes that match the given name")
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("pkill" . "Send signals to processes based on name and other attributes"))
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"Alist mapping Linux process-checking commands to their descriptions.")
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(defun describe-linux-process-command (command)
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"Describe the purpose of a Linux process-checking command.
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Takes COMMAND as an argument and prints its description."
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(interactive "sEnter Linux process command (e.g., ps): ")
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(let ((description (assoc-default command linux-process-commands-alist)))
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(if description
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(message "%s: %s" command description)
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(message "Unknown command: %s" command))))
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(defvar linux-logfiles-alist
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'(("/var/log/syslog" . "System messages, including the messages that are logged during system startup")
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("/var/log/auth.log" . "Security/authorization information, including user logins and authentication")
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("/var/log/kern.log" . "Kernel logs")
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("/var/log/cron.log" . "Logs for cron jobs")
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("/var/log/messages" . "General system activity logs")
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("/var/log/boot.log" . "System boot log")
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("/var/log/daemon.log" . "Background daemon log messages")
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("/var/log/dpkg.log" . "Logs for package installations and removals")
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("/var/log/mail.log" . "Mail server logs")
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("/var/log/user.log" . "User-level messages"))
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"Alist mapping Linux log files to their descriptions.")
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(defun describe-linux-logfile (logfile)
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"Describe the purpose of a Linux log file.
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Takes LOGFILE as an argument and prints its description."
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(interactive "sEnter Linux log file path (e.g., /var/log/syslog): ")
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(let ((description (assoc-default logfile linux-logfiles-alist)))
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(if description
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(message "%s: %s" logfile description)
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(message "Unknown log file: %s" logfile))))
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(defvar linux-basic-commands-alist
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'(("ls" . "List directory contents")
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("cd" . "Change directory")
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("mv" . "Move or rename files")
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("cp" . "Copy files")
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("rm" . "Remove files or directories")
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("pwd" . "Print working directory")
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("echo" . "Display a line of text or a variable value")
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("touch" . "Create an empty file or update the access/modification time of a file")
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("chmod" . "Change file permissions")
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("chown" . "Change file ownership"))
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"Alist mapping basic Linux commands to their descriptions.")
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(defun describe-basic-linux-command (command)
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"Describe the purpose of a basic Linux command.
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Takes COMMAND as an argument and prints its description."
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(interactive "sEnter basic Linux command (e.g., ls): ")
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(let ((description (assoc-default command linux-basic-commands-alist)))
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(if description
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(message "%s: %s" command description)
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(message "Unknown command: %s" command))))
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(defvar chown-options-alist
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'(("-R" . "Operate on files and directories recursively")
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("--from" . "Change the owner and/or group of each file only if its current owner and/or group match specified values")
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("--no-dereference" . "Affect symbolic links instead of the files they point to")
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("--preserve-root" . "Fail when attempting to operate recursively on '/'")
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("--reference" . "Use owner and group of a reference file")
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("-c" . "Report when a change is made")
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("-f" . "Suppress most error messages")
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("-v" . "Output a diagnostic for every file processed"))
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"Alist mapping chown command options to their descriptions.")
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(defun describe-chown-option (option)
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"Describe the purpose of a chown option.
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Takes OPTION as an argument and prints its description."
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(interactive "sEnter chown option (e.g., -R): ")
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(let ((description (assoc-default option chown-options-alist)))
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(if description
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(message "%s: %s" option description)
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(message "Unknown chown option: %s" option))))
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(defvar chmod-options-alist
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'(("-R" . "Operate on files and directories recursively")
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("--preserve-root" . "Avoid operating recursively on '/'")
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("-c" . "Report when a change is made")
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("-f" . "Suppress most error messages")
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("-v" . "Output a diagnostic for every file processed")
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("--reference" . "Use mode of a reference file")
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("-w" . "Remove write permission")
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("-x" . "Remove execute permission")
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("-u" . "Set user ID on execution")
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("-g" . "Set group ID on execution"))
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"Alist mapping chmod command options to their descriptions.")
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(defun describe-chmod-option (option)
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"Describe the purpose of a chmod option.
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Takes OPTION as an argument and prints its description."
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(interactive "sEnter chmod option (e.g., -R): ")
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(let ((description (assoc-default option chmod-options-alist)))
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(if description
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(message "%s: %s" option description)
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(message "Unknown chmod option: %s" option))))
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