linux 命令2

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 ':'