An A-Z Index of the Bash command line for Linux.
  adduser  Add a user to the system
  addgroup Add a group to the system
  alias    Create an alias ?
  apropos  Search Help manual pages (man -k)
  apt-get  Search for and install software packages (Debian/Ubuntu)
  aptitude Search for and install software packages (Debian/Ubuntu)
  aspell  Spell Checker
  awk      Find and Replace text, database sort/validate/index
b
  basename Strip directory and suffix from filenames
  bash    GNU Bourne-Again SHell linux中netstat命令
  bc      Arbitrary precision calculator language
  bg      Send to background
  break    Exit from a loop ?
  builtin  Run a shell builtin
  bzip2    Compress or decompress named file(s)
c
  cal      Display a calendar
  case    Conditionally perform a command
  cat      Display the contents of a file
  cd      Change Directory
  cfdisk  Partition table manipulator for Linux
  chgrp    Change group ownership
  chmod    Change access permissions
  chown    Change file owner and group
  chroot  Run a command with a different root directory
  chkconfig System services (runlevel)
  cksum    Print CRC checksum and byte counts
  clear    Clear terminal screen
  cmp      Compare two files
  comm    Compare two sorted files line by line
  command  Run a command - ignoring shell functions ?
  continue Resume the next iteration of a loop ?
  cp      Copy one or more files to another location
  cron    Daemon to execute scheduled commands
  crontab  Schedule a command to run at a later time
  csplit  Split a file into context-determined pieces
  cut      Divide a file into several parts
d
  date    Display or change the date & time
  dc      Desk Calculator
  dd      Convert and copy a file, write disk headers, boot records
  ddrescue Data recovery tool
  declare  Declare variables and give them attributes ?
  df      Display free disk space
  diff    Display the differences between two files
  diff3    Show differences among three files
  dig      DNS lookup
  dir      Briefly list directory contents
  dircolors Colour setup for `ls'
  dirname  Convert a full pathname to just a path
  dirs    Display list of remembered directories
  dmesg    Print kernel & driver messages
  du      Estimate file space usage
e
  echo    Display message on screen ?
  egrep    Search file(s) for lines that match an extended expression
  eject    Eject removable media
  enable  Enable and disable builtin shell commands ?
  env      Environment variables
  ethtool  Ethernet card settings
  eval    Evaluate several commands/arguments
  exec    Execute a command
  exit    Exit the shell
  expect  Automate arbitrary applications accessed over a terminal
  expand  Convert tabs to spaces
  export  Set an environment variable
  expr    Evaluate expressions
f
  false    Do nothing, unsuccessfully
  fdformat Low-level format a floppy disk
  fdisk    Partition table manipulator for Linux
  fg      Send job to foreground
  fgrep    Search file(s) for lines that match a fixed string
  file    Determine file type
  find    Search for files that meet a desired criteria
  fmt      Reformat paragraph text
  fold    Wrap text to fit a specified width.
  for      Expand words, and execute commands
  format  Format disks or tapes
  free    Display memory usage
  fsck    File system consistency check and repair
  ftp      File Transfer Protocol
  function Define Function Macros
  fuser    Identify/kill the process that is accessing a file
g
  gawk    Find and Replace text within file(s)
  getopts  Parse positional parameters
  grep    Search file(s) for lines that match a given pattern
  groups  Print group names a user is in
  gzip    Compress or decompress named file(s)
h
  hash    Remember the full pathname of a name argument
  head    Output the first part of file(s)
  help    Display help for a built-in command ?
  history  Command History
  hostname Print or set system name
i
  id      Print user and group id's
  if      Conditionally perform a command
  ifconfig Configure a network interface
  ifdown  Stop a network interface
  ifup    Start a network interface up
  import  Capture an X server screen and save the image to file

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