Passwd : Change user password
|
Pwd : print working Directory
|
Cd : Change directory
|
Ls : list of files in a directory
|
Wildcards : * matches any number of
characters, ‘?’ matches a single
character
|
File : print the type of file
|
Cat : Displays the content of the file
|
Pr : Displays the contents of a file
|
pg or page : Display the contents of a file one
page at a time
|
More : Display the contents of a file one
page at a time
|
Clear : Clears the screen
|
Cp or
Copy : copy a file
|
Chown : Change the owner of a file
|
chgrp : Change the group of a file
|
chmod : Change file modes, permissions
|
rm : Remove a file from the system
|
mv : Rename a file
|
mkdir : Create a directory
|
rmdir : Remove a directory
|
grep : Pattern matching
|
Egrep : grep command for extended
regular expressions
|
find : Used to locate files and directories
|
>> : Append to the end of a file
|
> : Redirect, create, or overwrite a
file
|
| : Pipe, used to string commands
together
|
|| : Logical OR—command1 ||command2
—execute command2 if command1
fails
|
& : Execute in background
|
&& : Logical AND—command1 &&
command2—execute command2 if
command1 succeeds
|
date : Display the system date and time
|
echo : Write strings to standard output
|
sleep : Execution halts for the specified
number of seconds
|
wc : Count the number of words, lines,
and characters in a file
|
head : View the top of a file
|
tail : View the end of a file
|
diff : Compare two files
|
sdiff : Compare two files side by side
(requires 132-character display)
|
spell : Spell checker
|
lp, lpr,
enq, qprt : Print a file
|
lpstat :Status of system print queues
|
enable : Enable, or start, a print queue
|
disable : Disable, or stop, a print queue
|
rwall : Display a message to all users on a
remote host
|
rsh or remsh
: Execute a command, or log in, on a
remote host
|
df : File systems statistics
|
ps : Information on currently running
processes
|
netstat : Show network status
|
vmstat :Show virtual memory status
|
cal : Display a calendar
|
who : Display information about users on
the system
|
w : Extended who command
|
whoami : Display $LOGNAME or $USER
environment parameter
|
who am I : Display login name, terminal, login
date/time, and where logged in
|
f, finger : Information about logged-in users
including the users .plan and .project
|
talk : Two users have a split screen
conversation
|
write : Display a message on a user’s screen
|
wall : Display a message on all logged-in
users’ screens
|
iostat : Show input/output status
|
uname : Name of the current operating
system, as well as machine
information
|
sar : System activity report
|
basename : Base filename of a string
parameter
|
man : Display the on-line reference manual
|
su : Switch to another user, also known as
super-user
|
cut : Write out selected characters
|
awk : Programming language to parse
characters
|
sed : Programming language for character
substitution
|
vi : Start the vi editor
|
emacs : Start the emacs editor
|
`command` : Command substitution
|
( ) : Run the enclosed command in a sub-
shell
|
(( )) : Evaluate and assign value to variable
and do math in a shell
|
$(( )) : Evaluate the enclosed expression
|
[ ] : Same as the test command
|
[[ ]] : Used for string comparison
|
$( ) : Command substitution
|
Chmod Permissions
4000
|
Sets user ID on execution
|
2000
|
Sets group ID on execution
|
1000
|
Sets the link permission to directories or sets the save-text attribute for files.
|
0400
|
Permits read by owner
|
0200
|
Permits write by owner
|
0100
|
Permits execute or search by owner
|
0040
|
Permits read by group
|
0020
|
Permits write by group
|
0010
|
Permits execute or search by group
|
0004
|
Permits read by others
|
0002
|
Permits write by others
|
0001
|
Permits execute or search by others
|
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