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===== Systeminfo =====

  /var/log/messages (suse)       #befehl: "logger test.txt"
  /var/log/syslog (ubuntu)       #befehl: "logger test.txt"
  /proc/devices                  #shows devices
  /proc/cpuinfo                  #shows cpu info
  /proc/ioports                  #view the I/O ports on your server (adresses of various hardware devices)
  /proc/interrupts               #view IRQ(hardware interrupt signal) assignments for linux systems
  /proc/dma                      #view DMA channels
  /proc/bus/pci/devices          #view the PCI (peripheral component interconnect) information on your linux system
  /proc/scsi/scsi                #view a summary of SCSI interfaces
  
  hwinfo                         #(or hwinfo --short or hwinfo --log writes info to a file)
  hwinfo --netcard
  hdparm                         #view info about hard drive 
  hdparm -i /dev/hda             #optimize hd
  fdisk                          #managing partions "fdisk -l" lists partition tables
  iostat                         #displays CPU and input/output (I/O) statistics
  lspci                          #displays information about PCIbuses (-v = verbose reports)
  siga                           #gathering system information 
  sitar                          #system infoprmaTion at runtime-reading /proc filesystem and write it to /tmp
  uptime                         #shows system time-uptime-number of users on the system-average numberr of jobs
  netstat                        #which networkports established which connections/ports
  uname                          #show current kernel(and system info)
  
  dmidecode                      #Show Systeminformation
  dmidecode -t 17                #Show info about memory
  
  who                            #shows currently logged in users (-r current runlevel, -a -H)
  w                              #displays info about users currently on the machine and their processes
  finger                         #shows info about local and remote system users
  last                           #shows last logged in user(last -ax)
  lastlog                        #formats and prints /var/log/lastlog)
  faillog                        #formats and displays /var/log/faillog (failure counts and limits)