Linux face question 002

1. Linux Mount Winodws shared folder

2. View the number of concurrent requests for HTTP and their TCP connection status:

3, with tcpdump sniffing 80 port access to see who the highest

4, Statistics/var/log/the number of files
Ls-l/var/log|grep "^-" |wc-l ls-l/var/log|grep "^-d" |wc-l Statistics folder count
5, view the current system per IP connection number

6.32-bit random password generation under shell
#!/bin/bash
#author: Ligths
Psd= "/proc/sys/kernel/random/uuid"
For PS in $PSD
Do
Echo $ps
Done

Cat/proc/sys/kernel/random/uuid
7, statistics of Apache Access.log in the most visited 5 IP

8. How to view the contents of a binary file
Vim
:%!xxd
Restore:%!xxd-r

9. What does the vsz in PS aux mean? What does RSS represent?

10, Detect and Repair/dev/hda5

11. Linux Boot Sequence
Bios-mbr-kernel-rc.d-kernel MODULE-RC*.D
12. The difference between symbolic links and hard links
ln
Ln-s
Symbolic connections are equivalent to shortcuts
A hard connection is equivalent to a map
13. Save the partition table of the current disk partition
P
15. Install Grub Manually

16, change the kernel parameters

17. Take a random number within 1-39
#!/bin/bash
#author: Ligths
Declare-i number= $RANDOM%39+1
Echo $number
18. Limit the number of Apache connections per second to 1 and a peak of 3

19. FTP Active and Passive mode

20, display/etc/inittab in the beginning of #, and followed by one or more white space characters, followed by any non-whitespace character line;

21, display/etc/inittab contains: A number: (that is, two colons in the middle of a number) line;

22, how to add their own script to the service inside, that is, you can use the service command to invoke

23, write a script to add 20 users in bulk, user name user1-20, password is user followed by 5 random characters
#!/bin/bash
#author: ligths
pd= $RANDOM
If [${# PD} \> 4];then
for ((i=1;i<=20;i++));
Do
Useradd/adduser user$i
passwd user$pd
Done
Else
echo "error"
Fi
24, write a script to achieve judgment 192.168.1.0/ 24 network, the current online IP has what, can ping general think online
#!/bin/bash
#author: Ligths
for ((i=1;i<=254;i++));
Do
Ping-c5 192.168.1. $i
Sleep
Done
25, write a script that determines whether a specified script is a syntax error, or if there is an error, Then remind the user to type Q or Q to ignore the error and exit any other keys to open the specified script via vim;
$? = = 2
Error
26, write a script:
1, create a function, can accept two parameters:
1) The first parameter is a URL, The second parameter is the directory, which is the location saved after download,
2) If the user-given directory does not exist, the user is prompted to create it, or if it is created, the function returns a 51 error value to the calling script;
3) If the given directory exists, download the file Download command after the execution of the test file download success or not; If successful, return 0 to the calling script, otherwise, return 52 to the calling script;
#!/bin/bash
#author: ligths
#methods 1
directory=$ 2
url=$1
Function A ()
{
If [!-D "$directory"];
Then

CD $directory
wget $url
Else
echo "Directory not find ISY create? (y/n) "
Read iy
Case $iy in
Y
mkdir $directory
;;
N
Echo 51
;;
Esac
Fi
}
A

#methods 2
Function B ()
{

if [!-D "$"];
Then

CD $
Wget $
Else
echo "Directory not find ISY create? (y/n) "
Read iy
Case $iy in
Y
mkdir
;;
N
Echo 51
;;
Esac
Fi
}

B $

27. Write a script:
1, create a function, you can accept a disk device path (such as/DEV/SDB) as a parameter, before actually starting the next step to remind the user of the danger, and let the user choose whether to continue;
Then empty all partitions on this disk device (prompt, using the command dd If=/dev/zero of=/dev/sdb bs=512 count=1 Implementation, note that the device path is not written incorrectly
If this step fails, return 67 to the main program;
Then create two primary partitions on this disk device, a size of 100M, a size of 1G, and if this step fails, return 68 to the main program;
Format this two partitions, the file system type is ext3; If this step fails, return 69 to the main program;
If the above procedure is normal, return 0 to the main program;
2, call this function, and by receiving function execution of the return value to determine its execution, and display the information

Not debugged
#!/bin/bash
#author: Ligths
Fucnction FD ()
{
Fdisk $
echo "The following is making changes to the disk, please careful operation (y/n)"
Read-p $isy
Case $isy in
Y

;;
N

;;
Esac
}

FD $

Linux face question 002