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rhel 5 training guide ch 01
Overview of Linux
42
Computer Science
Professional
03/08/2010
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Term
list hidden files
 Definition
ls -a
Term
list File types and what does it show for each type
 Definition
ls -F
/ for directories
* for executable
@ for symbolic links
nothing for text files
Term
display file size in human readable format
 Definition
ls -lh
-l to show file size
-h to make it human readable
Term
display the long listing of a directory name but not the contents
 Definition
ls -ld
Term
display the contents of a directory and all of its sub-directories
 Definition
ls -R
Term
list files sorted by date, newest first
 Definition
ls -t
Term
list files sorted by date, oldest first
 Definition
ls -tr
Term
display files with detailed information, oldest first
 Definition
ls -ltr
Term
display files with detailed information, sorted by date, newest first
 Definition
ls -lt
Term
display the current directory
 Definition
pwd
Term
go back to the home directory - two answers
 Definition
cd
cd ~
Term
go to the dir1 sub-directory of the home directory
 Definition
cd ~/dir1
Term
go to the home directory of user2
 Definition
cd ~user2
Term
switch to the previous directory
 Definition
cd -
Term
display the pseudo terminal where you are logged in
 Definition
tty
Term
display all current logged in users
 Definition
who
Term
display the name of the current user
 Definition
who am i
whoami
Term
what is the w command
 Definition
the what command
Term
dislay detailed information about who is logged in to the machine
 Definition
w
Term
display the name of the first user to log in
 Definition
logname
Term
you have used su to switch users several times, display the username of the initial login
 Definition
logname
Term
display the user ID
 Definition
id
Term
display user2's group ID
 Definition
id user2
Term
display all the system information
 Definition
uname -a
Term
display the system name
 Definition
hostname
Term
remove the text from the screen
 Definition
clear
Term
display the date and time, also to make a change
 Definition
date
Term
display a calendar for the current month
 Definition
cal
Term
display the date and time based on the hardware clock
 Definition
hwclock
Term
what is the path of a command (ex: cat)
 Definition
which cat
Term
find the location of a command (ex: cat)
 Definition
whereis cat
Term
display the lines, words, and character counts(or bytes) of a file
 Definition
wc filename
Term
print the line count, word count, byte count, and character count for the file file1
 Definition
wc -l file1
wc -w file1
wc -c file1
wc -m file1
Term
send a message to all logged in users - how does it work
 Definition
wall
start typing
ctrl+d to send the message
Term
show the instructions for the cat command
 Definition
man cat
Term
how do you search forward for the word "text" in a man page
 Definition
/text
Term
how do you search backwards for "text" in a man page
 Definition
?text
Term
you've searched for "text" in a man page, now find the next instance and the previous instance
 Definition
n
N
Term
you are viewing a man page, move forward one page, backward one page
 Definition
f/space/Page down
b/Page up
Term
perform a command keyword search for password - two answers
 Definition
man -k password
apropos password
Term
who the help page for passwd
 Definition
passwd --help
Term
display the short description for the command passwd - two answers
 Definition
whatis passwd
man -f passwd
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