who
who am i
ssh scott@192.168.1.105
ps aux | grep pts/8
pwd // where are you?
Page 205
mkdir -p dir1/dir2/dir3/dir4/dir5
rm -r dir1 //deleted all directory (include subDirectory)
rmdir -p dir1/dir2/dir3/dir4/dir5 //just need type all subDirectory
PATH is important -----vbird page 205
echo $PATH
add varia
PATH= "$PATH":/root
-------------
create shortCut link the origin file
touch DeskTop/a.txt
cp -s DeskTop/a.txt .
cp -s DeskTop/a.txt b.txt
which
whereis
locate (updatedb)
find
find ~/ -name dir6.txt //need type which directory
find /home -name dir6.txt
//redirect Page 394
// >> > << < 2>> 2>
find /home -name dir6.txt >> ret.txt 2>> errRet.txt //just redirect
-------------
mount /umount:
ln [option] ..target ..DIRECTORY
help
------------
fdisk -help
---------
mkfs -t ext3
--------
mount ios image
mount -o loop /root/centos6.3_x86_64.iso /mnt/centos_dvd
umount /mnt/centos_dvd
compress / uncompress
bzip2 a.txt
bunzip2 a.txt.bz2
--------------------
touch a.txt
nano a.txt
vim a.txt
gedit a.txt
emac a.txt
--------------------
:sp /etc/a.txt
--------------
set
unset
read
array
declare
alias lm='ls -al' //bie ming
unalias lm
-----------------//hackerssa
history //list the history what you type
//Page 396
/dev/null
//do not display stderr infomation(display stdout only)
find /home -name dir6.txt > ret.txt 2> /dev/null
==========================
cat > catFile
bala bala.....
bala...
ctrl +D(terminated enter)
=========================
cat > catFile << "eof"
bala bala....
bala ...
eof (teminated by auto, when you type "eof")
standard input < << output > >>
standard error output 2> 2>>
======================
;, &&, ||
condition
===========
$?
cmd1 && cmd2 if (cmd1 == ture), so excute cmd2;
if(cmd1 != True), so do not excute
excute cmd2
cmd1 || cmd2 if (cmd1 == ture), so do not excute cmd2;
if(cmd1 != True), so excute cmd2
==================
pipe
cut //Page 401
echo $PATH //just take a look
echo $PATH | cut -d ':' -f 5 //display the fiveth info, separate by ':'
grep //Page 402 display something which need condition
ls -al /etc | less //display standard output to other
ls -al /etc | grep dir_1 //display directory which name is "dir_1"
=====================
export
//display all the infomation about login (it's important)
last
last | grep 'scott' //display login infomation as scott (account)
last | grep 'scott' //display login infomation as root
==================
sort order
sort, wc, uniq
ls | sort
ls | sort -n
ls | sort -r
ls | sort -f
ls | sort -t ':'