how many kilobytes in gigabyte

= parameters with-xmanagement (-xmanagement: class =, classpath =) You can specify a management class and its classpath. this option loads the class and causes its empty constructor to be called early in JVM startup. from the constructor, a new thread is then started, from which your management client is run.Bea jrockit Management Console-XMSSets the initial size of the heap. you shoshould set the initial heap size (-XMS) to the same size as the maximum heap size. this value can be specified in

1 TB = 1024 GB 1 GB = 1024 MB 1 MB = 1024kb 1kb = 1024 byte note: byte means B, that is, byte KB is a kilobytes of MB, that is, GB is a Gigabit, that is, a gigabit. Generally, they can be viewed as a kilobytes of data, the accuracy is that 1024 is the 10th power of 2. In the unit of storage capacity, bytes are the most basic unit, that is, what we usually call B (bytes). It has several expansion units, name

is restarted every two hours.● 50 7 ***/sbin/service sshd start means to enable the ssh service at every day● 50 22 ***/sbin/service sshd stop means to close the ssh service at every day● 0 0 ** fsck/home check/home disk on the 1st and 15th of each month● 1 ***/home/bruce/backup: Execute the file/home/bruce/backup at the first point of every hour.● 00 03 ** 1-5 find/home "*. xxx "-mtime + 4-exec rm {}\; every Monday to Friday three o'clock, in the directory/home, find the file name *. xxx file,

Time Format controller: HH24: MI: SS AM HH12: MI: SS PM "" Is used to control the format of special characters. SELECT TO_CHAR (SYSDATE, 'fmyyyy "year" mm "month" dd "day" ') from dual; DDSPTH ~~ DD is the format controller. TH is the ordinal word, which converts a date into an English ordinal word spelling. SP is a base number word that converts a date into a base number spelling in English. TO_CHAR (NUM [, 'format _ model' [, nlsparams]) to convert numbers Convert the NUMBER type parameter NU

0.00 0.00 0.00 0.00 0.00 0.0006:19:49 eth0 0.02 0.12 0.33 0.33 66.00 354.0 0.00 0.00Time column: the response Time of the current sample.Lo and eth0: Nic name.RKB/s: Number of kilobytes received per second.WKB/s: Number of kilobytes written per second.RPk/s: the number of packets received per second.WPk/s: number of data packets written per second.RAvs: Average size of

having to write to the swap area.The content shown below isOrdinal column name meaning apid process IDB PPID Parent Process Idcruserreal User ide of the usernamedUID process owner USER the user name of the process owner fgroup the group name of the process owner g TTY the terminal name of the startup process. Processes that are not started from the terminal are displayed as ?hPR priority i The ninice value. Negative values indicate high priority, positive values indicate low priority jp last

ftp server proftpd 5. Client AccessClient command line: Win7 64bit command Impersonate A1 User login: ~ ftp# Establish connection ftp> open 192.168.1.201 connected to 192.168.1.201. ProFTPD 1.3.4a Server (blog.fens.me FTP server) [:: ffff:192.168.1.201] User (192.168.1.201: (None)): a1331 Password Required for A1 password: User A1 logged in# view directory ftp> dir200 PORT command successful150 Opening ASCII mode data connection For file Listdrwxrws---2 A1 a 4096 3 12:59 ADRWXRWS---2 b1

owner 5 USER User name of the process owner 6 GROUP Group Name of Process owner 7 Tty The terminal name of the startup process. A process that is not started from the terminal is displayed as? 8 PR Priority level 9 NI Nice value. Negative values indicate high priority, positive number indicates low priority 10 P Last CPU used, only meaningful in multi-C

Specifies the process number displayTop-n 3 cycles displayed, updated to show 3 times after stopThe following is a description of the result information for top:PID Process IDPPID Parent Process IDRuser Real User NameUser ID of the UID process ownerUsername of user Process OwnerGroup Process Owner's namePR-PriorityNI nice value. Negative values indicate high priority, positive values indicate low priority%cpu percentage of CPU time that was last updated to currentThe total CPU time, in seconds,

Performance analysisVmstatVirtual Memory StatisticsUsage Usage: Vmstat [Options] [delay [count]] Options: -A,--active active/inactive memory -F,--forks number of forks since boot -M,--slabs Slabinfo -N,--one-header do not redisplay header -S,--stats event counter statistics -D,--disk disk statistics -D,--disk-sum summarize disk statistics -P,--partition -S,--unit -W,--wide wide output -T,--timestamp show timestamp -H,--help display this help and exit -V,

Performance AnalysisVmstatVirtual Memory StatisticsUsage Usage: Vmstat [Options] [delay [count]] Options: -A,--active active/inactive memory -F,--forks number of forks since boot -M,--slabs Slabinfo -N,--one-header do not redisplay header -S,--stats event counter statistics -D,--disk disk statistics -D,--disk-sum summarize disk statistics -P,--partition -S,--unit -W,--wide wide output -T,--timestamp show timestamp -H,--help display this help and exit -V,

-transfer.logOnce again server~ sudo /etc/init.d/proftpd restart * Stopping ftp server proftpd 5. Client InterviewClient command line: Win7 64bit commandAnalog A1 User login:~ ftp#建立连接ftp> open 192.168.1.201连接到 192.168.1.201。ProFTPD 1.3.4a Server (blog.fens.me FTP server) [:: ffff:192.168.1.201] User (192.168.1.201: (None)): a1331 Password Required for a1password:230 User A1 logged in# view folder ftp> dir200 PORT command successful150 Opening ASCII mode Data conn ection for File Listdrw

:1913084133835.000.00157202841571689696.26 mmmm15:08:201308435807.000.00158635041584975697.07 mmmm15:0 8:211308419273.870.00159490401579294496.72 MMMMThe output of the above columns has the following meanings:MINFLT/S: Number of page faults per second (minor page faults), the number of times page faults means that the virtual memory address is mapped to the physical memory address generated by the page fault number majflt/s: Number of main faults per second (Major page faults), When the virtu

activity. He is a statistical analysis of the overall situation of the system, and the disadvantage is that a process cannot be analyzed in depth. Usually use Vmstat 5 5 (which means to generate data every 5 seconds and generate 5 data) command tests. Will get a summary of the data he can reflect the real system situation.#vmstat 5 5procs-----------Memory-------------Swap-------io------System------CPU----R b swpd free buff cache si so bi bo in CS US sy ID WA1 0 62792 3460 9116 88092 6 30 189 89

the overall situation of the system statistics, the disadvantage is that a process can not be in-depth analysis. Typically, Vmstat 5 5 (for 5 sampling in 5 seconds) is used to test the command. Will get a summary of the data he can reflect the real system situation.#vmstat 5 5procs-----------Memory-------------Swap-------io------System------CPU----R b swpd free buff cache si so bi bo in CS US sy ID WA1 0 62792 3460 9116 88092 6 30 189 89 1061 569 17 28-54 20 0 62792 3400, 9124 88092 0 00 14 884

ownerPR-----Priority of processesNI------Nice value, negative indicates higher priority, positive values indicate low priorityVirt---The total amount of virtual memory used by the process in kilobytes. of which Virt=swap RESThe size, in kilobytes, of the physical memory used by the RES----process, which is not swapped out. Res=code DATASHR---The size, in kilobytes