Definition (in your own words) of the chosen keyword.
The creation and manipulations of a file.
Demonstration of the chosen keyword.
lab46:~$ lab46:~$ cat > file.c Any text can go here ^D (command to end operation) lab46:~$ lab46:~$ cat file.c Any text can go here lab46:~$
Definition (in your own words) of the chosen keyword.
Screen-oriented text editor originally created for the Unix operating system.
Demonstration of the chosen keyword.
Lets use file.c from the previous topic.
Syntax: vi [-rR][file…]
Exiting and Entering VI:
ZZ save file and exit VI
:wq same as above
:e! return to last saved version of current file
:q quit without save, (Note :q! is required if changes have been made)
:w write without exit (:w! to force write)
lab46:~$ vi file.c * enters VI program Any text can go here ~ ~ "file.c" 2L, 22C 1,1 ALL :q lab46:~$
Definition (in your own words) of the chosen keyword.
Environment variables are a set of dynamic named values that can affect the way running processes will behave on a computer.
Demonstration of the chosen keyword.
Environment Variables include:
USER (your login name)
HOME (the path name of your home directory)
HOST (the name of the computer you are using)
ARCH (the architecture of the computers processor)
DISPLAY (the name of the computer screen to display X windows)
PRINTER (the default printer to send print jobs)
PATH (the directories the shell should search to find a command)
env: Display environment variables.
lab46:~$ env Term=xterm SHELL=/bin/bash SSH_CLIENT=67.252.199.108 61408 22 SSH_TTY=/dev/pts/74 USER=tedmist1 MAIL=/home/tedmist1/Maildir PATH=/usr/lcoal/bin:/usr/bin:/bin:/usr/bin/X11:/usr/games LC_COLLATE=C PWD=/home/tedmist1 HISTCONTROL=ignoreboth SHLVL=1 HOME=/home/tedmist1 LOGNAME=tedmist1 SSH_CONNECTION=67.252.119.108 61408 10.80.2.38 22 _=/usr/bin/env OLDPWD=/usr/local/bin lab46:~$
Definition (in your own words) of the chosen keyword.
PATH is an environment variable on Unix-like operating systems. This path specifies a set of directories where executable programs are located.
Demonstration of the chosen keyword.
Examples of SHELL variables are:
cwd (your current working directory)
home (the path name of your home directory)
path (the directories the shell should search to find a command)
prompt (the text string used to prompt for interactive commands shell your login shell)
SHELL variables are both set and displayed using the set command.
lab46:~$ set BASH=/bin/bash HOME=/home/tedmist1 LOGNAME=tedmist1 PWD=/home/tedmist1 SHELL=/bin/bash USER=tedmist1 lab46:~$
Definition (in your own words) of the chosen keyword.
A special character usually used in the middle of a search term in a keyword search to retrieve results containing words with any character or no character in the position.
Demonstration of the chosen keyword.
Syntax:
? Matches any one character in a filename.
* Matches any character or characters in a filename.
[ ] Matches one of the characters included inside the [ ] symbols.
lab46:~$ lab46:~$ cd script lab46:~/script$ ls file1 file2 file3 file4 file5 file6 file8 script8 typescript lab46:~/script$ ls file? file1 file2 file3 file4 file5 file6 file7 file8 lab46:~/script$ ls file* file1 file2 file3 file4 file5 file6 file7 file8 lab46:~/script$ ls [f]* file1 file2 file3 file4 file5 file6 file7 file8 lab46:~/script$
Definition (in your own words) of the chosen keyword.
Tab completion is a common feature of command line interpreters, in which the program automatically fills in partially typed commands.
Demonstration of the chosen keyword.
Changing directories into your home directory.
If you haven't provided unique enough information to the command-line, the tab completion cannot complete. Hitting tab a second time will give you a list of possible choices.
lab46:~$ cd ho <-- hit tab lab46:~$ cd home/ <-- this is what should appear after hitting the tab command <hit return> lab46:~/home$
lab46:~$ cd home/ <-- if you hit the tab command twice the next prompt should appear: lab46:~$ cd home/ .swp username/
Definition (in your own words) of the chosen keyword.
The ability to suspend an interactive job and resume it at a later time, or send it into the “background”.
Demonstration of the chosen keyword.
Need to know information:
Process ID (PID): a unique number assigned to each running process on the system.
Foreground Process: a process that is running in the foreground (currently using STDIN/STDOUT/STDERR).
Background Process: a process that is running independently in the background, allowing you to use your shell (which is in your foreground) or start additional applications.
Killing a Process: in UNIX, you can terminate processes with the kill(1) utility.
The ps(1) utility is used to list the running processes on the system. Running with no arguments will show the current processes attached to your login session.
The kill(1) utility is used to terminate certain PID numbers running.
lab46:~$ ps USER PID %CPU %MEM VSZ RSS TTY STAT START TIME COMMAND tedmist1 13123 1.0 0.1 13628 1956 pts/74 SNs 12:53 0:00 -bash tedmist1 13126 0.0 0.0 8588 996 pts/74 RN+ 12:53 0:00 ps u lab46:~$ kill 13123 lab46:~$
Definition (in your own words) of the chosen keyword.
A program that decodes instructions written in a higher order language and produces an assembly language program.
Demonstration of the chosen keyword.
The Unix command for compiling C/C++ code is gcc.
Where hello is the name of the desired executable, and hello.c is the name of the text file containing the program source.
The -o argument to gcc indicates the name of the output file.
C Compiler
lab46:~$ gcc -o hello hello.c lab46:~$ ls hello (green coloration indicating it as a special file) hello.c lab46:~$
C++ Compiler
Where hello1 is the name of the desired executable, and hello.cc is the name of the text file containing the program source.
The -o argument to g++ indicates the name of the output file.
lab46:~$ g++ -o hello1 hello.cc lab46:~$ ls hello1 (green coloration indicating it as a special file) hello.cc lab46:~$
State the course objective
The ability to accomplish/automate tasks
In your own words, define what that objective entails.
The ability to create ones own task, and have it run at a certain point of time on each day you so wish it to run.
State the method you will use for measuring successful academic/intellectual achievement of this objective.
Such an objective can be accomplished using the cron command. Cron the name of a program that enables Unix users to execute commands or scripts automatically at a specified time/date.* * * * * command to be executed - - - - - | | | | | | | | | +----- day of week (0 - 6) (Sunday=0) | | | +------- month (1 - 12) | | +--------- day of month (1 - 31) | +----------- hour (0 - 23) +------------- min (0 - 59)
Follow your method and obtain a measurement. Document the results here.
The method of measurement would be the times in which your task will be occurring. If the task only runs for a week the measurement of that task will be a week.
Reflect upon your results of the measurement to ascertain your achievement of the particular course objective.
Good, in this objective I learned how to automate tasks to my wanting.
* Is there room for improvement?
Yes, by learning all the commands and proper syntax involved.
* Could the measurement process be enhanced to be more effective?
No, it will just take time to learn such things.
* Do you think this enhancement would be efficient to employ?
Yes, by running tasks on certain days, thus you would not forget to run them on that day.
* Could the course objective be altered to be more applicable? How would you alter it?
The course objective is just fine the way it is. It is already applicable, thus no changes needed to be made.