Linux+python Maintenance Course 4th--Marco----------------------

1 , find a line in the/etc/rc.d/init.d/functions file followed by a set of parentheses, such as: Hello ();

[[email protected] ~]# grep--color=auto ' \<[[:alpha:]]\+\> () '/etc/rc.d/init.d/functionscheckpid () {daemon () { Killproc () {Pidfileofproc () {Pidofproc () {status () {success () {failure () {passed () {warning () {=} () {strstr () { Confirm () {

2.Use the echo command to output an absolute path, using grep to remove its base name;

[Email protected] ~]# echo '/etc/rc.d/init.d/functions ' | GREP--COLOR=AUTO-E-O ' [^/]+$ ' functions

Extension: Take out its path name

[Email protected] ~]# echo '/etc/rc.d/init.d/functions ' | Grep--color=auto-o ' ^\/.*\/'/etc/rc.d/init.d/

3, find out the results of the ifconfig command between 1-255 numbers;

[Email protected] ~]# Ifconfig | grep--color=auto-e-O ' \< ([1-9]|[ 1-9][0-9]|1[0-9][0-9]|2[0-4][0-9]|25[0-5]) \> ' 291921682041921682025525525525564186127125511281

4, find the current system does not belong to the main or group of files;

[[Email protected] ~]# find / \ ( -nouser -o -nogroup \)  - exec ls-lh {} \; Total dosage  0 total dosage  0-rw-r--r--.  1 1005 distro 18 10 Month  16 2014/home/mandriva/.bash_logout-rw-r--r--.  1 1005 distro 124 10 Month   16 2014/home/mandriva/.bashrc-rw-r--r--.  1 1005 distro 176 10 Month  16 2014 /home/mandriva/.bash_profile Total dosage  4.0kdrwxr-xr-x. 2 1005 distro 1.0k 8 month    18 2010 extensionsdrwxr-xr-x. 2 1005 distro 1.0k 8 Month   18  2010 plugins Total dosage  0 total dosage  0find:  "/PROC/3802/TASK/3802/FD/5":  no file or directory find:  "/ PROC/3802/TASK/3802/FD/5 ":  does not have that file or directory find: "/PROC/3802/TASK/3802/FDINFO/5 ":  does not have that file or directory find:  "/PROC/3802/TASK/3802/FDINFO/5":  does not have that file or directory find:  "/PROC/3802/FD/5":  does not have that file or directory find:  "/proc/ 3802/FD/5 ":  does not have that file or directoryfind:  "/PROC/3802/FDINFO/5":  does not have that file or directory find:  "/PROC/3802/FDINFO/5":  does not have that file or directory-rw-r-----.  1 27 27 0 8 month    3 2016 /var/log/mysqld.log Total dosage  0- RW-RW----.  1 1005 mail 0 12 Month  2501:22 /var/spool/mail/mandriva-rw-rw-r--.  1 root 3004 0 2 month    7 23:12 /tmp/test1-rw-rw-r--.  1  3004 root 0 2 month    7 23:12 /tmp/test2-rw-rw-r--.  1 3004  3004 0 2 Month    7 23:12 /tmp/test

[[email protected] ~]# find / \ ( -nouser  -o -nogroup \)  -a -atime-3 -exec ls -lh {} \; Total dosage  0 Total dosage  0 Total dosage  4.0kdrwxr-xr-x. 2 1005 distro 1.0k 8 month   18 2010  Extensionsdrwxr-xr-x. 2 1005 distro 1.0k 8 month   18 2010 plugins Total dosage  0 total dosage  0find:  "/PROC/3841/TASK/3841/FD/5":  not have that file or directory find:  "/proc/3841/task/3841/fdinfo /5 ":  does not have that file or directory find: "/PROC/3841/FD/5 ":  does not have that file or directory find: "/PROC/3841/FDINFO/5 ":  No that file or directory total usage  0-rw-rw-r--.  1 root 3004 0 2 month    7 23:12 / Tmp/test1-rw-rw-r--.  1 3004 root 0 2 Month    7 23:12 /tmp/ Test2-rw-rw-r--.  1 3004 3004 0 2 Month    7 23:12 /tmp/test 

5.Find all files that are larger than 1M in/etc directory and are of normal file type;

[Email protected] ~]# find/etc-size +1m-type f-exec ls-lh{} \;-rw-r--r--. 1 root root 2.1M August 3 2016/etc/gconf/gconf.xml.defaults/%gconf-tree.xml-rw-r--r--. 1 root root 7.8M August 3 2016/etc/selinux/targeted/modules/active/policy.kern-rw-r--r--. 1 root root 7.8M August 3 2016/etc/selinux/targeted/policy/policy.24

6, find/etc/init.d/directory, all users have execute permission, and other users have write permission files;

[Email protected] ~]# touch/etc/init.d/test; chmod u+x,g+x,o+xw/etc/init.d/test; Find/etc/init.d/-perm-113-exec ls-lh {} \;; Rm-rf/etc/init.d/test-rwxr-xrwx. 1 root root 0 February 8 05:58/etc/init.d/test

7.Find files whose contents have been modified and not rooted or Hadoop for the last week in/etc directory;

[Email protected] ~]# Useradd jady; Useradd Hadoop; Touch/etc/test; Chown Jady/etc/test; echo ' Test ' >/etc/test; find/etc/\ (-type f-a-mtime-7-a-not \ (-user root-o-user hadoop \) \)-exec Ls-lh {} \; Rm-rf/etc/test; Userdel-r Jady; Userdel-r Hadoop-rw-r--r--. 1 jady Root 5 February 8 06:27/etc/test

8.Copy the/etc/rc.d/rc.sysinit file to the/tmp directory and add # to the beginning of the line with at least one whitespace character in the/tmp/rc.sysinit file;

[Email protected] ~]# cp/etc/rc.d/rc.sysinit/tmp/; Ll-h/tmp/rc.sysinit-rwxr-xr-x. 1 root root 20K February 8 22:44/tmp/rc.sysinit[[email protected] ~]# vim/tmp/rc.sysinit:%[email protected]^[[:space:]]@# &@g

9.Remove the # and white space characters from the/tmp/rc.sysinit file that begin with # and followed by at least one white-space character

[Email protected] ~]# vim/tmp/rc.sysinit:%[email protected]^#[[:space:]]\[email protected]@g

Change the last 0 of all enabled=0 or gpgcheck=0 in the/etc/yum.repos.d/centos-media.repo file to 1;

[[email protected] ~]# Vim/etc/yum.repos.d/centos-media.repo:%[email protected][email protected][email protected]:% [Email protected] [Email protected] [Email protected]

one, weekly 2,4,6 backup/var/log/messages files to/backup/messages_logs/directory, saved filenames like messages-20161202

[[email protected] ~]# CRONTAB-L30 0 * * 2,4,6 [-d/backup/messages] | | /bin/mkdir-pv/backup/messages >/dev/null &&/bin/cp/var/log/messages/backup/messages/messages\-$ (/bin/ Date +\%y\%m\%d) [[email protected] ~]# ll-h/backup/messages/total usage 260k-rw-------. 1 root root 259K February 9 00:30 messages-20170209

everytwo hours per day, take all the information in the current system/proc/meminfo file to the/stats/memory.txt file

[[email protected] ~]# CRONTAB-L50 */2 * * * [-f/stats/memory] | | /bin/mkdir-pv/stats/memory >/dev/null &&/bin/grep--color=auto-i "^s"/proc/meminfo >>/stats/memory . Txt[[email protected] ~]# ll/stats/memory.txt-rw-r--r--. 1 root root 196 February 9 00:50/stats/memory.txt

Write a script to create 10 user user10-user19, password and user name;

[[email protected] ~]# vim useradd.sh  1 #!/bin/bash  2 #  Program:  3 #        Create 10 accounts user10 to User19, with the same password as the account name;   4 # history:  5 #       2017-02-08       jady    1.0  6   7 path= /bin:/sbin:/usr/bin:/usr/sbin:/usr/local/bin:/usr/local/sbin:~/bin  8 export path   9  10 # 1, non-admin account when creating an account alert to exit; 11 if [ !  $UID  -eq 0  ] ; then 12         echo  "Sorry, Only Admin account can create user! " 13         exit 1 14 fi 15   16 # 2, cycle create account User10 to user19; 17 for index in  ' seq 10 1 19 '  ; do 18&nBsp;        if id user$index &> /dev/null  ; then 19                  read -p  "user$index  account already exists in the system, delete re-create (y/n)?"  username 20                  if [  $username  =  "Y"  ] ; then 21                           userdel -r user$index 22                          if  [ $? -eq 0 ] ; then 23                  &nbSp;               useradd user $index  24                                  if  [ $? -eq 0 ] ; then 25                                           echo  "user$ Index " | passwd --stdin user$index &> /dev/null 26                                            echo  "Original  user$index  account with home directory has been deleted, while creating new  user$index  account; " 27                                   fi 28                          fi  29                  else 30                          echo  "Retain original  user$index  account information;"  31                  fi 32          else 33                  useradd user$index 34                  if [ $? -eq 0 ] ;  then 35                          echo  "User$index"  | passwd -- stdin user$index &> /dev/null 36                          echo   "user$index  account creation success! " 37                  fi 38         fi 39 done [[email  protected] ~]# bash -n useradd.sh [[email protected] ~]# useradd  User10 ; useradd user18 ; bash useradd.shuser10  account already exists in the system, delete re-create (Y/N)? N Retain original  user10  account information;user11  account creation success! user12  Account creation Success! user13  Account creation Success! user14  Account creation Success! user15  Account creation Success! user16  Account creation Success! user17  Account creation Success! user18  account already exists in the system, delete re-create (y/n)? Y original  user18  account together with home directory has been deleted, while creating new  user18  account;user19  account creation success!

Linux+python Operation Course 4th--Marco--3rd time (20170212)