Linux/Unix Command Hand Book

I've decided to write down the command/program I am currently learning in my book SAMS Teach Yourself UNIX in 24 Hours and tested on my Ubuntu Server.

Work in progress...

alias [create custom command shortcut]
apropos [info about a command]
awk [scanning and text processing]
bg [BackGround job monitoring?]
cal [CALandar]
cat [conCATenate]
cc [Compile in C]
cd [Change Directory]
chown [CHange OWNer]
chmod [CHange MODe (file access permission)]
chsh [CHange login SHell]
clear [clear terminal screen]
compress [file compression utility]
cp [CoPy file or folder]
cpio [CoPy In and Out of archive]
cut [remove section from each line of file]
date [diplay the current date]
df [Disk Free]
dig [DNS Lookup utility]
du [Disk Usage]
echo [display a line of text]
egrep [print line matching a pattern]
env [user ENVironment settings]
exit [logout]
fg [re-run last program?]
fgrep [print line matching a pattern]
file [determine file type]
find [search for file]
finger [user info]
free [display memory usage] 
ftp [internet File Transfert Protocol program]
grep [print line matching a pattern]
gzip [compress or expand files]
gunzip [compress or expand files]
head [output the first part of a file]
help []
history [list command used]
host [static name table lookup]
id [display user]
jobs [display programs status]
kill [send signal to process]
logout []
lp [Line Printer]
ln [make LiNks between files]
ls [LiSt directory content]
lsmod [LiSt kernel MODule status]
lspci [LiSt PCI device and hardware]
man [MANual]
make [utility to maintain groups of programs]
mesg [write access to terminal (MESsaGe)]
mkdir [MaKe DIRectories]
more [screen file viewer]
mount [mount a file system]
mv [MoVe or rename files]
passwd [change user PASSWorD]
pinky [lightweight finger command]
poweroff [shut down system]
ps [ProceSs list]
pwd [Present Working Directory]
reboot [restart system]
rlogin [Remote LOGIN - open ssh client]
rm [ReMove (file)]
rmdir [ReMove empty DIRectory]
scp [Secure remote CoPy]
set [define variable]
shutdown [restart process?]
sort [sort line of text file]
source [?]
start [job control utility]
sudo [execute a command as root - SUperuser]
tail [output the last part of a file]
tar [archiving utiliry]
telnet [user interface for telnet session]
time [system ressource usage]
top [process monitor]
touch [create file or modify timestamp]
tty
uncompess
umask
umount
uniq
users
useradd
w
wc
wget
whatis
which
who
whoami
who am i
wrongwords

 

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ls

Interesting flags:
-a [List all files, including dot files]
-F [Indicate file types: / for directory, * for program, @ for symbolic link]
-l [long listing]
-R [Recursive]
-s [Show size of files]

Others flags: m,d,C,1,x,t,r

Example of Favorite combination:
ls -laF

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Comments

[Lochan]

grep port: ssh

#grep ssh /etc/services
#netstat -ntpul|grep ssh