Section 1
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Cards (253)
Section 1
(50 cards)
date
Display or change the date & time
bc
Arbitrary precision calculator language
cut
Divide a file into several parts
dig
DNS lookup
dmesg
Print kernel & driver messages
command
Run a command - ignoring shell functions
cron
Daemon to execute scheduled commands
break
Exit from a loop
dirs
Display list of remembered directories
cat
Concatenate and print (display) the content of files
aptitude
Search for and install software packages (Debian/Ubuntu)
aspell
Spell Checker
echo
Display message on screen
declare
Declare variables and give them attributes
apropos
Search Help manual pages (man -k)
diff3
Show differences among three files
bg
Send to background
chmod
Change access permissions
dirname
Convert a full pathname to just a path
chown
Change file owner and group
chroot
Run a command with a different root directory
cksum
Print CRC checksum and byte counts
bzip2
Compress or decompress named file(s)
comm
Compare two sorted files line by line
dir
Briefly list directory contents
apt-get
Search for and install software packages (Debian/Ubuntu)
dircolors
Colour setup for `ls'
chkconfig
System services (runlevel)
du
Estimate file space usage
clear
Clear terminal screen
continue
Resume the next iteration of a loop
ddrescue
Data recovery tool
builtin
Run a shell builtin
awk
Find and Replace text, database sort/validate/index
diff
Display the differences between two files
cd
Change Directory
dd
Convert and copy a file, write disk headers, boot records
df
Display free disk space
dc
Desk Calculator
cmp
Compare two files
basename
Strip directory and suffix from filenames
chgrp
Change group ownership
cp
Copy one or more files to another location
cfdisk
Partition table manipulator for Linux
csplit
Split a file into context-determined pieces
crontab
Schedule a command to run at a later time
bash
GNU Bourne-Again SHell
case
Conditionally perform a command
alias
Create an alias
cal
Display a calendar
Section 2
(50 cards)
groups
Print group names a user is in
hash
Remember the full pathname of a name argument
find
Search for files that meet a desired criteria
exec
Execute a command
expr
Evaluate expressions
fgrep
Search file(s) for lines that match a fixed string
ethtool
Ethernet card settings
free
Display memory usage
FALSE
Do nothing, unsuccessfully
fuser
Identify/kill the process that is accessing a file
id
Print user and group id's
groupmod
Modify a group
help
Display help for a built-in command
for
Expand words, and execute commands
export
Set an environment variable
if
Conditionally perform a command
jobs
List active jobs
fdisk
Partition table manipulator for Linux
groupadd
Add a user security group
expect
Automate arbitrary applications accessed over a terminal
function
Define Function Macros
getopts
Parse positional parameters
exit
Exit the shell
fg
Send job to foreground
ifup
Start a network interface up
egrep
Search file(s) for lines that match an extended expression
file
Determine file type
fsck
File system consistency check and repair
eval
Evaluate several commands/arguments
history
Command History
iconv
Convert the character set of a file
env
Environment variables
import
Capture an X server screen and save the image to file
fmt
Reformat paragraph text
ifconfig
Configure a network interface
fold
Wrap text to fit a specified width.
head
Output the first part of file(s)
hostname
Print or set system name
enable
Enable and disable builtin shell commands
grep
Search file(s) for lines that match a given pattern
ifdown
Stop a network interface
ftp
File Transfer Protocol
format
Format disks or tapes
eject
Eject removable media
fdformat
Low-level format a floppy disk
groupdel
Delete a group
gzip
Compress or decompress named file(s)
install
Copy files and set attributes
expand
Convert tabs to spaces
gawk
Find and Replace text within file(s)
Section 3
(50 cards)
kill
Stop a process from running
lpr
Off line print
pkill
Stop processes from running
most
Browse or page through a text file
lprintq
List the print queue
notify-se
nd Send desktop notifications
lsof
List open files
pathchk
Check file name portability
logout
Exit a login shell
ln
Create a symbolic link to a file
make
Recompile a group of programs
killall
Kill processes by name
less
Display output one screen at a time
nice
Set the priority of a command or job
join
Join lines on a common field
mtr
Network diagnostics (traceroute/ping)
mkdir
Create new folder(s)
mknod
Make block or character special files
printenv
Print environment variables
lprintd
Abort a print job
man
Help manual
ls
List information about file(s)
locate
Find files
netstat
Networking information
ping
Test a network connection
mkisofs
Create an hybrid ISO9660/JOLIET/HFS filesystem
mkfifo
Make FIFOs (named pipes)
mount
Mount a file system
lpc
Line printer control program
op
Operator access
let
Perform arithmetic on shell variables
nl
Number lines and write files
local
Create variables
logname
Print current login name
passwd
Modify a user password
open
Open a file in its default application
look
Display lines beginning with a given string
lprm
Remove jobs from the print queue
nohup
Run a command immune to hangups
popd
Restore the previous value of the current directory
printcap
Printer capability database
link
Create a link to a file
nslookup
Query Internet name servers interactively
mmv
Mass Move and rename (files)
pr
Prepare files for printing
mtools
Manipulate MS-DOS files
more
Display output one screen at a time
paste
Merge lines of files
mv
Move or rename files or directories
lprint
Print a file
Section 4
(50 cards)
quota
Display disk usage and limits
pv
Monitor the progress of data through a pipe
rename
Rename files
rsync
Remote file copy (Synchronize file trees)
suspend
Suspend execution of this shell
sdiff
Merge two files interactively
sftp
Secure File Transfer Program
read
Read a line from standard input
sort
Sort text files
sync
Synchronize data on disk with memory
tail
Output the last part of file
tar
Store, list or extract files in an archive
stat
Display file or file system status
sed
Stream Editor
su
Substitute user identity
set
Manipulate shell variables and functions
readonly
Mark variables/functions as readonly
pwd
Print Working Directory
screen
Multiplex terminal, run remote shells via ssh
rcp
Copy files between two machines
tee
Redirect output to multiple files
sum
Print a checksum for a file
shutdown
Shutdown or restart linux
return
Exit a shell function
source
Run commands from a file '.'
sudo
Execute a command as another user
strace
Trace system calls and signals
select
Accept keyboard input
shopt
Shell Options
shift
Shift positional parameters
split
Split a file into fixed-size pieces
slocate
Find files
quotactl
Set disk quotas
ssh
Secure Shell client (remote login program)
remsync
Synchronize remote files via email
quotachec
k Scan a file system for disk usage
ram
ram disk device
seq
Print numeric sequences
printf
Format and print data
rm
Remove files
ps
Process status
rar
Archive files with compression
renice
Alter priority of running processes
rmdir
Remove folder(s)
rev
Reverse lines of a file
readarray
Read from stdin into an array variable
sleep
Delay for a specified time
pushd
Save and then change the current directory
scp
Secure copy (remote file copy)
reboot
Reboot the system
Section 5
(50 cards)
umask
Users file creation mask
wget
Retrieve web pages or files via HTTP, HTTPS or FTP
tty
Print filename of terminal on stdin
test
Evaluate a conditional expression
times
User and system times
umount
Unmount a device
tracerout
e Trace Route to Host
trap
Run a command when a signal is set(bourne)
time
Measure Program running time
ulimit
Limit user resources
unset
Remove variable or function names
users
List users currently logged in
xdg-open
Open a file or URL in the user's preferred application.
wait
Wait for a process to complete
yes
Print a string until interrupted
until
Execute commands (until error)
whoami
Print the current user id and name (`id -un')
uname
Print system information
touch
Change file timestamps
write
Send a message to another user
vdir
Verbosely list directory contents (`ls -l -b')
unrar
Extract files from a rar archive
useradd
Create new user account
units
Convert units from one scale to another
timeout
Run a command with a time limit
uniq
Uniquify files
tsort
Topological sort
top
List processes running on the system
which
Search the user's $path for a program file
unshar
Unpack shell archive scripts
whereis
Search the user's $path, man pages and source files for a program
uudecode
Decode a file created by uuencode
uuencode
Encode a binary file
who
Print all usernames currently logged in
vmstat
Report virtual memory statistics
v
Verbosely list directory contents (`ls -l -b')
type
Describe a command
vi
Text Editor
tr
Translate, squeeze, and/or delete characters
TRUE
Do nothing, successfully
unalias
Remove an alias
userdel
Delete a user account
while
Execute commands
wc
Print byte, word, and line counts
xargs
Execute utility, passing constructed argument list(s)
watch
Execute/display a program periodically
usermod
Modify user account
zip
Package and compress (archive) files.
uptime
Show uptime
unexpand
Convert spaces to tabs
Section 6
(3 cards)