sy0 501

-e '/111/' p-n test.txt rot:x:0:0:rot:/rot:/bin/bash11111111111111111111111111111111Can write multiple with-E, and-e equivalent to the belt, first match the front of the printing, and then match the subsequent printing, so the first line printing 2 times;[[email protected] ~]# sed-e '/root/p '-e '/bash/p '-n 1.txtroot:x:0:0:root:/root:/bin/bashroot:x:0:0:root:/root:/bin/ bashoperator:x:11:0:operator:/root:/sbin/nologinuser1:x:500:500::/home/user1:/bin/bashuser2:x:

with the name Tom.txt and file system type not VFATFind/tmp-name wa*-type L Find a file with a type of symbolic link at/tmp that begins with the name WAFind/home-mtime-2 in/home search for files that have changed in the last two daysfind/home-atime-1 checked files accessed within 1 daysFind/home-mmin +60 The files that were changed 60 minutes ago at/homeFind/home-amin +30 Check the files that were accessed last 30 minutes agoFind/home-newer Tmp.txt in/home check update time than tmp.txt files o

May find/mnt-name Tom.txt-ftype vfat look for files with the name/mnt and file system type Tom.txt under VFAT find/mnt -name T.txt! -ftype VFAT under/mnt Look for files with the name Tom.txt and file system type not VFAT find/tmp-name wa* l look for files with a type of symbolic link at/tmp that begins with the name WA Ind/home-mtime-2 in/home under the last two days to changeFiles that were moved find/home-atime-1 checked for files accessed within 1 days find/home-mmin +60 was changed at/home

fileAbsolute pathFile in the real location of the system, the file name begins with "/"Relative pathThe file relative to the current location of the name of a shorthand, the name does not start with/, and the name will automatically add the value of the PWD displayIII. Management of documents1.touch creating files or modifying file timestampsTouch File Creation File650) this.width=650; "Width=" 501 "height=" 281 "title=" 221 01.png "style=" width:586

respectively, and the additional group is the tech group, creating another user lily[Email protected] ~]# useradd-u 501-g nsd-g Tech Jim[[email protected] ~]# ID Jimuid=501 (Jim) gid=501 (NSD) Group =501 (NSD), (Tech)[Email protected] ~]# useradd-u 502-g jsd-g Tech Tom[[email protected] ~]# ID Tomuid=502 (Tom) gid=502

password inactive after expiration to inactive-G,--gid Group Force use Group as new primary group-G,--groups groups new list of supplementary groups-A,--append append the user to the supplemental GROUPSmentioned by the-g option without removingHim/Her from other groups-H,--help display this help message and exit-L,--login new_login NEW value of the login name-L,--lock lock the user account-M,--move-home move contents of the home directory to theNew location (with only with-d)-O,--non-unique all

{Deny all;} 16 Configure Nginx, prohibit illegal domain name resolution visit corporate websiteMethod 1: Let the user who uses IP to access the website, or the user who resolves the domain name maliciously, receives 501 error, the command is as follows:server {Listen 80;Servername ;return 501;}Method 2: Jump to the home page via 301, with the following command:server {Listen 80;Servername ;Rewrite ^

associations! ^_^. But here you may find it strange that: ' If I join multiple groups at the same time, then when I do my homework, what is the group? ' Let's talk about the concept of ' effective group '. # Active Group (effective group) and initial group (initial group) Remember that every user has the so-called GID in the fourth column of his/etc/passwd? That GID is the so-called ' initial group ' (initial group)! That is, when the user is logged into the system, immediately has the meanin

0200 Total 0644-rw-r--r--1 root root 3886 Sep 7 20:08 bench.sh 0644- rw-r--r--1 root 4398 Aug 22:26 init.sh 0644-rw-r--r--. 1 root 10281 Dec 1 2014 install.log 0644-rw-r--r--. 1 root 3317 Dec 1 2014 install.log.syslog [root@vps197121 ~]# ls-la 0200 Total 10550 Dr-xr-x---. 5 root 4096 Sep 8 19:00. 0555 Dr-xr-xr-x. Root root 4096 Aug 31 02:47. 0600-RW-------. 1 root 3376 Sep 8 18:37. Bash_history 0644-rw-r--r--. 1 root 2009 Bash_logout 0644-rw-r--r--. 1 root 176 May 2009 Bash_profile 0644-rw-r

passwd user name creates password for user 30 User admin # passwd-d passwd-d username Delete user password can also log in 31 User Management # PASSWD-L passwd-l username Lock account Password 32 User Management # passwd-u passwd-u user name unlock account password 33 User Management # PASSWD-S passwd-s username Query account password 34 User Management # Usermod-l usermod-l new username old user name renamed to User 35 User admin # usermod-l usermod-l to lock user name lock User Login 3

SQL Server random data Extraction efficiency optimization2013-05-11 1 Comments Vegetable Light Collection I want to contributeSQL Server random data Extraction efficiency optimization Hermit I recently encountered a very tangled matter, is how to quickly extract a random data from the data table. I generated a simple data table and imported 500W data for testing. is the SQL statement that was used for the first time: Declare @d DatetimeSet @d=getdate ()SELECT Top 1[activityid], [Cardno], [Passwo

:: globalaggregates:: resolveaggregatefunctions:: timewindowing:: Resolveinlinetables (conf):: Resolvetimezone (conf):: resolveduuidexpressions:: Typecoercion.typecoerc Ionrules (conf) + + Extendedresolutionrules: _*), Batch ("Post-hoc Resolution", Once, Posthocresolutionrules: _*), Batch ("View", Once, Aliasviewchild (conf)), batch ("Nondeterministic", Once, pulloutnondeterministic), Bat CH ("UDF", Once, handlenullinputsforudf), batch ("Fixnullability", Once, fixnullability), batch ("subquer

mysql-client-5.6.23-1.linux_glibc2.5[Email protected] init.d]#5: Delete the folder that corresponds to MySQLCheck that the individual MySQL folders are cleaned and removed cleanly.[[email protected] INIT.D] # Whereis MySQLMysql:[[email protected] INIT.D] # Find/-name MySQL/var/lib/mysql/var/lib/mysql/mysql/usr/lib64/mysql[[email protected] INIT.D] # Rm-rf/var/lib/mysql[[email protected] INIT.D] # Rm-rf/var/lib/mysql/mysql[[email protected] INIT.D] # Rm-rf/usr/lib64/mysql6: Delete MySQL users an

.linux_glibc2.5 You have new mail in/var/spool/mail/root [Email protected] init.d]# Rpm-ev mysql-client-5.6.23-1.linux_glibc2.5 [Email protected] init.d]# 5: Delete the folder that corresponds to MySQL Check that the individual MySQL folders are cleaned and removed cleanly. [[email protected] init.d]# Whereis MySQL Mysql: [[email protected] init.d]# Find/-name MySQL /var/lib/mysql /var/lib/mysql/mysql /usr/lib64/mysql [Email protected] init.d]# Rm-rf/var/lib/mysql [Email protected] init.d]# R

cleanly. [[email protected] INIT.D] # Whereis MySQL Mysql: [[email protected] INIT.D] # Find/-name MySQL /var/lib/mysql /var/lib/mysql/mysql /usr/lib64/mysql [[email protected] INIT.D] # Rm-rf/var/lib/mysql [[email protected] INIT.D] # Rm-rf/var/lib/mysql/mysql [[email protected] INIT.D] # Rm-rf/usr/lib64/mysql 6: Delete MySQL users and user groups If necessary, delete the MySQL user and the MySQL user group. [[Email protected] ~] # more/etc/passwd | grep mysql Mysql:x:101:

] init.d]# Rm-rf/var/lib/mysql [Email protected] init.d]# Rm-rf/var/lib/mysql/mysql [Email protected] init.d]# Rm-rf/usr/lib64/mysql 6: Delete MySQL users and user groups If necessary, delete the MySQL user and the MySQL user group. [Email protected] ~]# MORE/ETC/PASSWD | grep MySQL Mysql:x:101:501::/home/mysql:/bin/bash [Email protected] ~]# More/etc/shadow | grep MySQL Mysql:!! : 16496:::::: [Email protected] ~]# More/etc/group | grep MySQL mysql:x

PlainCopy print? [Email protected] ~]# echo >/proc/sys/vm/nr_hugepages ⑶ increase the size of the maximum shared memory segment, this example 12G[Plain]View PlainCopyprint? [Email protected] ~]# echo 1560281088 >/proc/sys/kernel/shmmax ⑷ increase the size of shared memory, 4K per page[Plain]View PlainCopyprint? [Email protected] ~]# echo 4194304 >/proc/sys/kernel/shmall ⑸ Adding a MySQL user-owned group to the system kernel[Plain]View PlainCopyprint?

] init.d]# Rpm-ev mysql-client-5.6.23-1.linux_glibc2.5 [Email protected] init.d]# 5: Delete the folder that corresponds to MySQL Check that the individual MySQL folders are cleaned and removed cleanly. [[email protected] init.d]# Whereis MySQL Mysql: [[email protected] init.d]# Find/-name MySQL /var/lib/mysql /var/lib/mysql/mysql /usr/lib64/mysql [Email protected] init.d]# Rm-rf/var/lib/mysql [Email protected] init.d]# Rm-rf/var/lib/mysql/mysql [Email protected] init.d]# Rm-rf/usr/lib64/mysql

the MySQL group, start directory is/home/test)Then enter the/etc/passwd, you can see the following information, in the last line you can see the information of the newly added user. As followsSshd:x:74:74:privilege-separated Ssh:/var/empty/sshd:/sbin/nologinDovecot:x:97:97:dovecot:/usr/libexec/dovecot:/sbin/nologinWebalizer:x:67:67:webalizer:/var/www/usage:/sbin/nologinSquid:x:23:23::/var/spool/squid:/sbin/nologinPcap:x:77:77::/var/arpwatch:/sbin/nologinHaldaemon:x:68:68:hal Daemon:/:/sbin/nolo

have changed in the last two daysfind/home-atime-1 checked files accessed within 1 daysFind/home-mmin +60 The files that were changed 60 minutes ago at/homeFind/home-amin +30 Check the files that were accessed last 30 minutes agoFind/home-newer Tmp.txt in/home check update time than tmp.txt files or directoriesFind/home-anewer tmp.txt a file or directory that is accessed more than tmp.txt near/homeFind/home-used-2 lists files or directories that have been accessed within 2nd after the file or d