centurylink home security system

1, Lilo security settings Vi/etc/lilo.conf.anaconda//Modify Lilo file =============================================== ...... Restricted//Join the line password=111111//Join this line and set the password to 111111 ...... ================================================ chmod 600/etc/lilo.conf.anaconda//set to root permission read /SBIN/LILO-V//update system to make the above operation effective Chattr +i/e

locate command is actually another way of writing "Find-name", but much faster than the latter because it does not search for a specific directory, but instead searches for a database (/var/lib/locatedb), which contains all the local file information. The Linux system automatically creates this database and updates it automatically once a day, so you can't find the latest changed files using the Locate command. To avoid this situation, you can manual

Clear automatically started services Displays the startup status of all running levels of all services# Chkconfig-listStop all services started on running level 3# For oldboy in 'chkconfig-list | grep 3: on | awk' {print $1} ''; do chkconfig-level 3 $ oldboy off; doneWhen common services are enabled, crond, network, rsyslog, and sshd# For oldboy in crond network rsyslog sshd; do chkconfig-level 3 $ oldboy on; doneShow all services under all 3 running levels (which service is started according to

Cleaning up the boot-up service Shows the startup status of all running levels for all services#chkconfig –listStop all services starting at run Level 3#for Oldboy in ' chkconfig–list |grep 3:on |awk ' {print $} ';d o chkconfig–level 3 $oldboy off;doneIn the opening of common services, crond,network,rsyslog,sshd#for Oldboy in Crond network Rsyslog sshd;do chkconfig–level 3 $oldboy on;doneShow all services under all 3 run levels (decide which service to start on demand)#chkconfig –list |grep 3:o

, one does not output the result of running) System ("PWD"); The PWD command for Linux is called directly. The command is disabled by default, in the php.ini Disable_functions = The following can be filled with a large number of forbidden functions, (multiple disabled functions, need to be separated by commas) such as Disable the Phpinfo () function so that the system cannot view the information for Phpinfo

after setting is complete.5. Installing the ARM compilerAccess the shared folder through the PC and copy the compiler to the shared folder so that the virtual machine can also be accessed. Install the extracted files.6. Configure Environment variablesUse VI in the virtual machine to modify the PATH variable in the/root/.bash_profile file to path=path:home/bin:/opt/host/armv4l/bin/, after disk execution: Source/root/.bash_ Profile, the armv4l-unknown-linux-gcc will be automatically searched late

#设定用户90天修改密码, 7 days in advance reminder userlist=$ (ls/home/|awk ' {print $NF} ' |grep-vlost+found) for userin $UserListdo chage-m90 -W7 $userdone # Forbidden pingecho1>/proc/sys/net/ipv4/icmp_echo_ignore_all# Set user Expiration time 90 default password length 8 bit cp/etc/login.defs/etc/login.defs.baksed-i '/pass_min_len/s/[0-9]\{1,6 \}/90/' /etc/login.defssed-i '/pass_min_len/s/[0-9]\{1,3\}/8/' /etc/login.defs# set user login, Normal User login id

the screen output, the rest will be output to the redirected file.10:testsystem called the system functionHeader file: #include 11:waitdemo1Call the Wait function: header file: #include Define function: pid_t wait (int* status);Return value: Success returns the child process PID, the failure returns 1, the reason is stored in errno.Waitdemo2: Similar to Waitdemo1, the difference is that the end state value of the child process is printed in three par

-LINUX-GCC command displayed when compiling the hello.c file was not found.Workaround: Check the previous Development Environment configuration section and discover that the environment variable path is set incorrectly, causing the command to be found later when using the compile command. Change the environment variable PATH to path= $PATH: The compilation will be completed successfully $HOME/bin:/opt/host/armv4l/bin/.2. The ARMV4L-UNKNOWN-LINUX-GCC c

: Is where the last keyword is located.Space (SPACEBAR): Page turn.Enter: Scrolls down one line.J,k (Vim Editor's move key): Scrolls forward backward by one line.H key: Displays use Help (because man uses less as a reader, which is actually the help of the less tool).Q: Exit.Info command: Get more help, but it's usually enough to use man.--help: If you know the purpose of a command, just want to quickly see some of its specific parameters.4. HomeworkOperation Steps:Results:(The '-W ' parameter s

Although Linux is a multi-user system like the Windows nt/2000 system, there are a number of important differences between them. For many administrators accustomed to Windows systems, there are many new challenges to ensuring that Linux operating systems are secure and reliable. This article will focus on the Linux system sec