RHCE033 Lecture15

Partitions and Filesystems

 

Inodes

 

A directory is a mapping between the human name for the file and the computer's inode number .

 

 

ln -s /root/1.txt .

 

ln-s ../1.txt 3.txt 

 

The seven fundamental file types

 

d   directory

 

b   block special file

 

c character special file

 

du -hs  /etc/      search  firm space 

 

df -h   serach  filesystem

 

Removable Media

 

tar cvf etc.tar /etc/

 

tar cvzf etc.tar.gz /etc/

 

file etc.tar      check the file format

 

tar cvjf etc.tar.bz2

 

tar vxf etc.tar.bz2 -C /tmp    -C   save the files to directory

 

vim users.txt

 

tom:123

jack:123

jace:123

 

vim /sample

 

 

#!/bin/bash

 

if  [   $UID -ne 0 ]

then

                 echo "Please run this scripts "

                  exit 1

 

fi

 

DBFILE=/root/users.txt

for USRINFO in 'cat $DBFILE

do

              USERNAME='echo  $USERINFO |cut -d: -f1 '

              PASSWORD='echo $USERINFO | cut -d: -f2'

              if 'id $USERNAME&> /dev/null '  ;then

                   echo " User exist." &> /dev/null

                   else

                                         useradd $USERNAME

                            fi

                                echo $PASSWORD | passwd - -stdin $USERNAME

 

              done