Day 6 COP 3502

1
Day 6COP 3502

• David A. Gaitros
• Department of Computer Science
• Florida State University

2
Misc Commands

• alias name 'command'
• Desciption Creates an alias for a command or
  shows what alias' exist
• Options name - specifies name of alias
• command - Command you want the alias used for
• Examples
• alias print "lpr -Plov260"ltrgt
• alias finger "ypcat passwdgrep -i"ltrgt
• alias copy "cp" ltrgt
• Demonstration

3
Misc. Commands

• bc file
• Desciption Handy desk calculator. Calculate
  numbers in a file or directly entered onto the
  screen.
• Options file - file that contains the bc
  commands.
• Examples
• bc ltrgt 6500 34 / 5 ltrgt
• Demonstration

4
Misc. Commands

• cal monthyear
• Desciption Displays a calendar for a month
  and/or year
• Options month - specifies a numeric month
• year - specifies a numeric year
• Examples
• cal 2 1955
• cal 1955
• Demonstration
• Note to self calendar program is used for
  appointments. Very primitive method of keeping a
  schedule.

5
Misc. Commands

• cat filename(s)
• Desciption Used to show text files. Displays to
  whole with no breaks. It is sometimes used to
  concatenate files together using the redirection
  feature of UNIX
• Options filename - files you want to display.
• Examples
• cat file1 file2 file3 gt file4
• Demonstration

6
Misc Commands

• clear
• Desciption clears the screen. Used a lot. Does
  not affect jobs, just clears the screen of
  clutter.
• date
• Desciption Lets you see today's date. Far too
  many options to really talk about right now.
• time
• Description Tells you how long it took a command
  to run.

7
Misc Commands

• echo stuff
• options stuff - a text string
• Desciption Echos the text string to standard
  output. Usually used inside a shell script or
  .tcshrc file.
• Demonstration

8
Misc Commands

• mesg yn
• Desciption Lets you control whether other people
  can use the write command to interrupt you with
  on screen messages.
• Options yn - self explanotory
• Examples
• msg n ltrgt
• Demonstration

9
Misc. Commands

• sort -b-d-f-f-m-n-r-ufields-o
  outputfile filename
• Desciption Sorts the lines of a text file. Very
  handy command you may have a need to use. Uses a
  very efficient sorting algorithm.
• Options -b - ingores spaces
• -d uses dictionary sort
• -f ignores capitilization
• -i ignores non print characters
• -m merges two files into one
• -n sorts based on number
• -r sorts in reversed order
• -u output same line once
• fields - file contains fields seperated by tab
  characters.
• -o outputfile - place results in this filename
• - filename - file to be sorts.
• Examples
• sort -dfro this.out 2 this.int
• Demonstration

10
Misc. Commands

• stty charname charsane-tostop-a
• Desciption Sets the options for your terminal.
• Options charname - specifies the terminal
  control function you want to see.
• char - Specifies the key(s) that you want use
  for this terminal control character.
• sane - Returns terminal to a "sane" state which
  is useful if your editor dies.
• -tostop - Turns off terminal stop mode.
• tostop - Turns on terminal stop mode.
• -a - displays all settings.
• Examples
• stty erase 'q'
• Demonstration

11
Misc. Commands

• talk user_at_computer
• Desciption Lets you have a conversation with
  another user by typing messags to each other. Not
  that the command mesg must be turned on for this
  to work.
• Options _at_computer - use to place the address of
  the use if they are not located on the same
  machine.
• Examples
• talk gaitrosd_at_diablo.cs.fsu.edu
• Demonstration

12
Misc. other commands

• Vacation -l
• Description - Automatically responds to incoming
  messages by telling people you are on vacation.
  The -l options stores the names of people who in
  a file called .maillog
• wall ltrgt stuffltrgt
• Description - Displays a message on the screen
  of every user on the system. You should never use
  this. Command is disabled in our system.