lastlog

versions, some also put wtmp here, and syslog. conf here The following files vary depending on your directory: Acct or pacct-records the Command records used by each user Access_log -- records the websites connected to your server when the server runs ncsa httpd. Aculog-stores the MODEMS records you dial out. Lastlog-records the most recent LOGIN records of the user and the initial destination of each user, and sometimes the records of LOGIN that are

commands (4)1. chmod changes the file or directory permissions.2. chown changes the owner and group of the file or directory.3. Change the file user group using chgrp.4. umask displays or sets the permission mask.12 Command for viewing system user login information (7)1. whoami displays the current valid user name, which is equivalent to executing the id-un Command.2. who displays the user information of the current logon system.3. w: displays the list of users that have logged on to the system

. If the user name is not root and the/etc/nologin file exists, login outputs the content of the nologin file and then exits. This is usually used to prevent non-Root User Logon during system maintenance. Only terminals registered in/etc/securetty allow the root user to log on. If this file does not exist, the root user can log on to any terminal. The/etc/usertty file is used to add access restrictions to users. If this file does not exist, there are no other restrictions. After the username i

There is no QQ or MSN in the command line. What if you want to communicate with other online personnel? 1. First, check who is online.WHO: You can view which users are online and when they log on;W: its function is similar to that of WHO, but it can display more detailed information (including what other users are currently doing, wow, watching QQ live)There are also last and lastlog to show which users have logged on and their logon logs recently. 2.

an ID, you can create a small table with only "ID" and "lastlog", instead of a large table with dozens or hundreds of columns of data; in addition, updating a table with 10 million records is generally slow compared to updating 10 tables with 1 million records.D> MyISAM engine, table-Level Lock, small single lock overhead, but large impact scope, suitable for reading tables with fewer writes, does not support transaction logs; Table lock does not hav

1 Command replacement is similar to redirection, but the difference is that command replacement uses the output of one command as the parameter of another command. Common command formats: Command1 'command2' The output of command2 is used as the parameter of command1. Note that the 'symbol is used as the command execution, and the execution result is used as the command1 parameter. For example: $ CD 'pwd' The command uses the directory listed by the PWD command as the parameter of the CD command

@ xiaoluo mysql] # cd xiaoluo/[root @ xiaoluo] # lsdb. opt 3./var/log mysql database log output storage location Some log output locations of our mysql database are stored in the/var/log directory.[Root @ xiaoluo] # cd [root @ xiaoluo ~] # Cd/var/log [root @ xiaoluo log] # lsamanda cron maillog-20130331 spice-vdagent.loganaconda.ifcfg.log cron-20130331 mcelog spooleranaconda. log cups messages spooler-20130331anaconda.program.log dirsrv messages-20130331 sssdanaconda. storage. log dmesg mysqld.

earliest and is very useful. For example, when the system is faulty, the administrator can warn everyone on the system to leave temporarily. UnameImportance: highOutput System Description (OS, kernel version, and so on) to stdout. Use the-a option to provide detailed information. The-s option only outputs the OS type. ArchImportance: MediumDisplays the hardware architecture of the system. It is equivalent to uname-m. LastcommImportance: lowThe information of the previous command is stored in th

record the content of the crontab service; 7)/var/log/httpd,/var/log/mysqld. log, and other files to record several different network service record files; 8)/var/log/acpid, ACPI-Advanced Configuration and Power Interface, indicating the Advanced Configuration and Power management interfaces.D indicates deamon. The acpid is the ACPI event daemon. That is, the message process of acpi. A service program used to control, obtain, and manage the status of acpi. 9)/var/run/utmp records the currently

:59 testdrwx ------. 2 mysql 4096 April 6 22:15 fowler // This is the fowler database we just created [root@shitouer.cn mysql] # cd fowler/[root@shitouer.cn fowler] # lsdb. opt [/shell] 3. /var/log mysql database log output storage location some of our mysql database log output storage location is in the/var/log directory [shell] [root@shitouer.cn fowler] # cd [root@shitouer.cn ~] # Cd/var/log [root@shitouer.cn log] # lsamanda cron maillog-20130331 spice-vdagent.loganaconda.ifcfg.log cron-201303

full-capability back doorO does not utilize sys_call_table but VFS layerO KISS principle, to have as less things in there as possibleBut also being as much powerful as possibleO hides itself from/proc and/sys filesystems O syslog filtering: logs generated by hidden processes never appearOn the syslog UNIX socket anymoreO wtmp/utmp/lastlog filtering: writing of xtmp entries by hidden processesDo not appear in the file, cannot you force it by using spe

User permission related Command 1, create group groupaddtest modify group groupmod-ntest2test will be changed to test2 delete group groupdeltest View Group groupsroot2, user operation:-B set the basic path as the user's login directory usermod... commands related to user permissions 1. create groupadd test, modify groupmod-n test2 test, change the name to test2, delete groupdel test, view group groups root2, and perform user operations: -B: set the basic path as the user's login directory usermo

Linux account management, user and group user account commands useradd add new user account usermod set user account information userdel delete user account passwd change user account password chage change user account password life finger Show user account information c... linux account management, user and group user account commands useradd add new user account usermod set user account information userdel delete user account passwd change user account password chage change user account passwo

22.57s 0.16s-bashroot pts/0 10.0.2.29 05:22 1:14m 0.06s 0.06s-bashroot pts/1 10.0.2.29 05:26 0.00s 0.22s 0.09s w# W.H.O.Root Tty1 .- ,- Geneva xx: -Root pts/0-08-02 05:22 (10.0.2.29)Root pts/1-08-02 05:26 (10.0.2.29)view currently logged on user # WhoAmI RootLastlog commandView User Last Login time # lastlog user name port from last login time root pts/1 10.0. 2.29 28 Month 2: £º

properties of some basic groups; The extended properties of the group are stored in the/etc/security/group file. Some system default groups exist after the system installation is: System, staff, bin, security, SYS, ADM, mail, corn, audit, PRINTQ, shutdown, etc.Create an account--the/etc/lib/security/mkuser.default file holds the default attribute value of the newly created user;/etc/security/login.cfg Store control user Login system and authentication configuration;User Login-/etc/security/envi

","/var/log/message","/var/log/lastlog","/var/log/auth.log","/var/log/vsftpd.log","/var/log/apache2/access.log","/var/log/apache2/error.log","/var/log/apache2/error.log.1","/usr/local/httpd/error.log","/apache/apache/message.log","/var/log/apache2/access_log","/var/log/apache2/error.log","/var/log/apache2/error_log","/var/log/apache/access.log","/var/log/apache/access_log","/var/log/apache/error.log","/var/log/apache/error_log","/var/www/logs/error_lo

user name is not root and the/etc/nologin file exists, login outputs the content of the nologin file and then exits. This is usually used to prevent non-root user logon during system maintenance. Only terminals registered in/etc/securetty allow the root user to log on. If this file does not exist, the root user can log on to any terminal. The/etc/usertty file is used to add access restrictions to users. If this file does not exist, there are no other restrictions. After the username is analyzed

GroupGroupmod is similar to usermod.Groupdel delete groupSu test changes su-to root and uses the root environment variable.Sudo executes commands in other identitiesVisudo edit/etc/sudoers and add a line "test ALL = (ALL) ALL 』% Wheel ALL = (ALL) ALL users in ALL the wheel groups in the system can use sudo.% Wheel ALL = (ALL) NOPASSWD: ALL users in the wheel group do not use the NOPASSWD password.User_Alias ADMPW = vbird, dmtsai, vbird1, and vbird3 are added to the ADMPW group.Admpw all = NOPAS

, you 'd better use "find/-user username" to find the username file in the system before executing userdel-r username, and then delete it. 5. switch user identity su-use root environment settings parameter file-l username use username environment settings parameter file sudo this is to allow the user to "enter your own password", refer to/etc/sudoers. We recommend that you use mongodo to edit the/etc/sudoers file, because mongodo will check the internal syntax of/etc/sudoers. To use sudo without

.0.logboot.log ibacm.log prelink Xorg.0.log.oldbtmp lastlog sa Xorg.1.logbtmp-20130401 libvirt samba Xorg.2.logcluster luci secure Xorg.9.logConsoleKit maillog secure-20130331 yum.log The mysqld. log file is the log information generated when we operate on the mysql database. by viewing this log file