Yinux

Hobbit is a system for monitoring servers and networks. It has a great deal of inspiration from the Big Brother monitor, but unlike Big Brother it is designed to work well whether you need to monitor small network with just a handful of hosts, or large networks with thousands of hosts. Hobbit monitors your hosts, your network services, and anything else you configure it to do via extensions. Hobbit will periodically generate requests to network services - http, ftp, smtp and so on - and record if the service is responding as expected. Through the use of agents installed on the servers, you can also monitor local disk utilisation, logfiles and processes. Manual

StartUpLite helps you disable or remove all known unnecessary startup entries from your machine, and thus quicken the startup procedure of your system.

Method 1: wget -bqco wget.log http://url/file.iso -b : run in background -o : log output to wget-log. -q : Turn off Wget’s output -c : Resume broken download i.e. continue getting a partially-downloaded file. Method 2: nohup wget http://url/file.iso &exit

Red Hat Enterprise Linux or CentOS 5 yum list available

To disable the function of reboot by ctrl+alt+del vi /etc/inittab #comment out the linux # ca:12345:ctrlaltdel:/sbin/shutdown -t1 -a -r now init q

A very useful script to manage Domain http://www.cyberciti.biz/tips/domain-check-script.html

Method 1: for oldname in *.mp3; do mv $oldname `basename $oldname .mp3`.mp4; done Method 2: rename 's/\.mp3$//' *.mp4

A webpage collecting the links of FREE ebook. http://www.appsapps.info/books/

vi /etc/sysconfig/i18n LANG="zh_TW.Big5" SYSFONT="latarcyrheb-sun16" SUPPORTED="zh_TW.Big5:zh_TW:zh" vi /etc/samba/smb.conf #Add the lines within Global section unix charset = cp950 dos charset = cp950 # sync;sync;reboot Result: 1. SSH can read T.Chi 2. FTP can read T.Chi 3. Samba can read T.Chi

Computers are only not designed for the Microsoft Windows. You may remove Microsoft sticker from your computer and choose your own sticker to replace it. http://www.pikao.nierox.com/

Shell Command Start # $ORACLE_HOME/bin/dbstart Using Server Manager Start # svrmgrl SVRMGR> connect internal SVRMGR> startup [ DBA | FORCE | SHARED | EXCLUSIVE ] Shell Command Shutdown # $ORACLE_HOME/bin/dbshut Using Server Manager Shutdown # svrmgrl SVRMGR> connect internal SVRMGR> shutdown [ normal | immediate | abort ]

SQLTools is a light weighted and robust tool for ORACLE database development. SQLTools is released under the GNU General Public License (GPL). Toad is a tool that improves the productivity of developers and DBAs by providing an easy-to-use development environment.

mkdir /mnt/iso mount -o loop -t iso9660 .iso /mnt/iso

# find . -name 'access*' | xargs rm

To solve a known memory leak problem of Firefox/Thunderbird, i.e. large amount of memory consumption, it is a way to release memory from RAM to Harddisk when minimizing to system tray. Install Add-ons Minimize To Tray Enhancer Configure Firefox/Thunderbird (Firefox) Type in about:config in URL bar (Thunderbird) Type > Options > Advanced > General > Click [Config Editor] Right Click in the page and select New > Boolean . Enter config.trim_on_minimize . Press Enter. Select True and then press Enter. Restart Firefox/Thunderbird

Download from: http://dag.wieers.com/rpm/packages/tcptrack/tcptrack-1.1.5-1.2.el5.rf.i386.rpm # tcptrack -i eth0 # tcptrack -i eth0 port 25 # tcptrack -i eth0 src or dst 76.11.22.12

伺服器端 啟動備份伺服器 $ vi /etc/xinetd.d/rsync disable = no $ service xinetd restart 設定備份伺服器 $ vi /etc/rsync.conf #中括號內的文字是自訂的備份代號，設定檔內可以有多個備份代號，每個代號之下可以有自已的設定 [backup01] #備份之檔案的存放路徑 (請先建立好路徑，並且要讓下面的 uid 及 gid 可以寫入檔案) path = /var/backup/backup01 #驗證的用戶名稱 (此名稱只需存在於密碼檔裡面即可) auth users = backup01 #執行程式時所使用的用戶及群組名稱，同時也會成為備份之後檔案的擁有者及擁有群組 uid = root gid = root #密碼檔的位置 secrets file = /etc/rsync.password read only = no $ vi /etc/rsync.password backup01:password $ chmod 600 /etc/rsync.password Client 端 rsync 做為同步處理時，常用的參數如下: * -a, --archive: archive mode, equivalent to -rlptgoD * 最常被使用的參數，相當於同時使用 "-rlptgoD" * -v, --verbose: increase verbosity * * -R, --relative: use relative path names 備份後，使用 Client 端完整的路徑，不加此參數，則為相對路徑 * -H, --hard-links: preserve hard links * * -S, --sparse: handle sparse files efficiently * * -z, --compress: compress file data * 壓縮傳輸的資料，以減少傳輸量 * --delete: delete files that don’t exist on sender * 進行同步...

Current Language: $ set | egrep '^(LANG|LC_)' Installed device drivers (modules) $ lsmod Information about an X server: $ xdpyinfo User shell name: $ ps -p $$ | tail -1 | awk '{ print $4 }' Dump Linux kernel variables $ /sbin/sysctl -a Running Linux kernel version: $ uname -mrs $ uname -a $ cat /proc/version Display list of all open ports $ netstat -tulpn

recursive grep $ grep -R "192.168.1.1" * ignore word case grep $ grep -i "car" /etc/passwd (i.e. including car, CAR, Car...) search words only $ grep -w "car" /path/to/file (i.e. match only car word) exclude grep $ grep -v car /path/to/file

http://www.linuxguruz.com/iptables/ IPtables Tutorial

Linux - Serial Console (Method 1 - Enable serial console on bootup) Linux - Serial Console (Method 2 - Enable serial console on bootup) Find Serial Port # dmesg | grep tty ttyS0 at 0x03f8 (irq = 4) is a 16550A # setserial -g /dev/ttyS0 /dev/ttyS0, UART: 16550A, Port: 0x03f8, IRQ: 4 Configure inittab # vi /etc/inittab (add the lines) # Run agetty on COM1/ttyS0 and COM2/ttyS1 s0:2345:respawn:/sbin/agetty -L -f /etc/issueserial 9600 ttyS0 vt100 # vi /etc/issueserial (add the lines) Hello Connected on \l at \b bps \U # init q Check the availability of change # ps -ef | grep agetty Allow login as root via serial # vi /etc/securetty console ttyS0 ttyS1 vc/1 ... (Optional) Configure serial port as system console # vi /etc/grub.conf # grub.conf generated by anaconda #boot=/dev/hda default=0 timeout=10 splashimage=(hd0,0)/grub/splash.xpm.gz title Red Hat Linux (2.4.20-24.9) root (hd0,0) kernel /vmlinuz-2.4.20-24.9 ro root=LABEL=/ console=ttyS0,9600 in...

To separate iptables' log from messages: # vi /etc/syslog.conf add the following lines #IPTables logging kern.debug;kern.info /var/log/firewall # service syslog restart Write iptable script: # vi /opt/iptables.sh add the following lines #!/bin/ksh #= Basic System conf ==============# #==================================# ip=192.168.1.123 ##### Load Modules modprobe ip_tables modprobe ip_conntrack_ftp modprobe ipt_state modprobe iptable_filter ##### Enable broadcast echo Protection #echo 1 >/proc/sys/net/ipv4/icmp_echo_ignore_broadcasts #= Basic Rules ====================# #==================================# ##### Flush all tables iptables --flush iptables -t nat --flush iptables -t mangle --flush ##### Debug Log #iptables -A INPUT -j LOG --log-prefix " *** Firewall Log *** " ##### create Chain iptables -X LOG_ACCEPT iptables -X LOG_DROP iptables -N LOG_ACCEPT iptables -N LOG_DROP ##### Default DROP all connections iptables --policy INPUT DROP iptables --policy OUTP...