System
Filesystem
Change the mode of all files to 666 (—rw-rw-rw) recursively from the current directory
find . -type f -exec chmod 666 {} \;
Change the mode of all directories to 777 (—rwxrwxrwx) recursively from the current directory
find . -type f -exec chmod 777 {} \;
CDROMs, DVDs and ISOs
Make an .ISO image file on-disk from a cdrom
dd if=/dev/cdrom of=cdrom.iso
Mount an ISO image
mount -o loop cdrom.iso /mnt/iso
Process Management
Find a process by name
ps -ef | grep <process name>
Kill a process by name
killall <process name>
Stop (pause) a process
kill -SIGSTOP <pid>
Stop (pause) a process and all it's children processes
kill -SIGSTOP -<pid>
To continue a stopped (paused) process use the SIGCONT signal instead.
Shell (Bash)
Spawn a process as a background job
$> <executable> &
List all jobs in the shell
$> jobs
Disown a spawned job (so it isn't killed when the shell exits)
$> disown %<job number>
Networking
Discovery
Ping broadcast
ping -b 192.168.1.255
DNS domain transfer
host -l <domain>
Ports
Find all opened ports and by whom
netstat -tulpn
Dump the arp entries
arp -a
Find open ports on a remote computer
nmap -v <IP or hostname>
Remote Desktops
Start a desktop session that can be accessed remotely
vncserver
Connect to the remote desktop session from your local computer
vncviewer <hostname or ip>:1
Initiate a reverse desktop connection (usually used to bypass firewalls)
from the client box
vncserver -listen <port>
from the system that owns the desktop
vncconfig -display :1 -connect <hostname or ip>:<port>
Edit ~/.vnc/xstartup to modify which desktop and applications auto start on your desktop
Start a desktop from within a desktop
xinit ~/.xinitrc -- `which Xnest` :5
where ~/.xinitrc contains:
#!/bin/bash
exec /usr/kde/3.5/bin/startkde
(or to your preferred window manager)
Applications
Firefox
Set the VM (Gentoo Specific)
in a browser tab type 'about:config'
Set the value java.default_java_location_others to /etc/java-config-2/current-system-vm
Java
List all VMs
java-config -L
Set the default VM
java-config -S <VM name>
VIM
Replace all occurances of string1 to string2 in a file
%s/string1/string2/g
Oracle Server 10g
General
Start the database
dbstart
Stop the database
dbstop
Start the TNS listener
tnslsnrctl start
Stop the TNS listener
tnslsnrctl stop
Get the status of the TNS listener
tnslsnrctl status
SQLPLUS
Login using a fully qualified specification
sqlplus <user>/<password>@<host>/<SID>
DataPump
Export a schema to a file
expdp <user>/<password> schemas=<schema name> directory=my_dumps logfile=dump.log dumpfile=dumpfile.dmp
Import a a dump file
impdp <user>/<password> schemas=<schema name> directory=my_dumps logfile=dump_import.log dumpfile=<dump filename>
Import a dumpfile while remapping it to another schema
impdp <user>/<password> schemas=<schema name> remap_schema=<schema name>:<new schema name> directory=my_dumps logfile=dump_import.log dumpfile=<dump filename>
Retrieve the number of clients connected to an Oracle server
sqlplus> select count(*) from v$sessions;
Enterprise Manager
Start/Stop/Status the Enterprise Manager
emctl start|stop|start dbconsole
Browser URL
[http://www.example.com http://<host>:1158/em]
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