What Is Unix Operating System Part 3




The basic command is used on Unix
Data security is an important issue in the field of information technology. UNIX in this respect far superior on the DOS does not provide this facility. DOS only has the ATTRIBUTE TABLE with a selection of facilities are Read Only and Hidden. DOS only provides facilities for file to hide (hidden) and protect file (read-only) so that it cannot be deleted or modified.

While the ownership of the facility file is not provided.
The following is a summary list of some basic commands that are frequently used on unix:



Commands for File Management
COMMAND DESCRIPTION
cat = display the contents of files (such as type in Dos)
cp = Copy one or more files (such as the copy in Dos)
find = Find certain files in a directory (such as Dir in Dos)
ls = Display file information
more = Display file per screen
mv = move a file to another directory
pg = display the contents of a text file per screen
rm = Remove file (same as Del on Dos)

Directory Management Commands
COMMAND DESCRIPTION
cd = Enable a directory as a directory
copy = copy the entire directory structure or file
mkdir = Make new directory
pwd = displays the name of the directory where we work
rmdir = Delete Directory

Command to set the Access Directory
COMMAND DESCRIPTION
chgrp = change the group of a directory
chmod = Change permissions of a file or directory
chown = Change owner of a file or directory

The Command System Environment
COMMAND DESCRIPTION
exit = exit the shell in Bourne shell and Korn shell
id = displays the user name along with the identity of the user
logname = displays the username
logout = out of the shell in the C shell
man = dri online documentation Displays a command of Unix (same as Help)
newgrp = change the effective group
passwd = Change password
set = Display environment variable on the user shell
tty = displays the name of the identity (port) terminal
uname = displays the name of the operating system
whoami = Print user name who are using the system

Relating to the screen
COMMAND DESCRIPTION
banner = large display
clear = Delete screen (same as Cls on DOS)
echo = display to the screen

The command that is associated with the process
COMMAND DESCRIPTION
kill = Stop a process based on the identity of the process
ps = Display running processes
sleep = Delay of execution (a process that is not doing anything for a few seconds)

Other commands
COMMAND DESCRIPTION
bc = utility to perform calculations
cal = display the calendar
date = displays the date and time of the system
grep = Mencri files that contain specific words
lp = Print file to the printer
mail = utility to convey written messages to other users
sort = Sort data
vi = Text Editor
wc = calculate the number of characters, words, and lines in a file



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