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/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)