Reference

Linux Network Commands

watch ss -tp	Network connections
netstat -ant	Tcp connections -anu=udp
netstat -tulpn	Connections with PIDs
lsof -i	Established connections
smb:// ip /share	Access windows smb share
share user x.x.x.x c$	Mount Windows share
smbclient -0 user\\\\ ip \\ share	Sl1B connect
ifconfig eth# ip I cidr	Set IP and netmask
ifconfig ethO:l ip I cidr	Set virtual interface
route add default gw gw lp	Set GW
ifconfig eth# mtu [size]	Change t~TO size
export l1AC=xx: XX: XX: XX: XX: XX	Change t~AC
ifconfig int hw ether t~AC	Change t~AC
macchanger -m l1AC int	Backtrack t~AC changer
iwlist int scan	Built-in wifi scanner
dig -x ip	Domain lookup for IP
host ip	Domain lookup for IP
host -t SRV service tcp.url.com	Domain SRV lookup
dig @ ip domain -t AXrR	DNS Zone Xfer
host -1 domain namesvr	DNS Zone Xfer
ip xfrm state list	Print existing VPN kejs
ip addr add ip I cidr aev ethO	Adds 'hidden' interface
/var/log/messages I grep DHCP	List DHCP assignments
tcpkill host ip and port port	Block ip:port
echo "1" /proc/sys/net/ipv4/ip forward	Turn on IP Forwarding
echo ''nameserver x.x.x.x'' /etc7resolv.conf	Add DNS Server

Linux system Info

Command	Description
nbtstat -A ip	Get hostname for ip
id	Current username
w	Logged on users
who -a	User information
last -a	Last users logged on
ps -ef	Process listing (top)
df -h	Disk usage (free)
uname -a	Kernel version/CPU info
mount	t1ounted file Sjstems
getent passwd	Show list of users
PATH~$PATH:/home/mypath	Add to PATH variable
kill pid	Kills process with pid
cat /etc/issue	Show OS info
cat /etc/'release'	Show OS version info
cat /proc/version	Show kernel info
rpm --querJ -all	Installed pkgs (Redhat)
rpm -ivh ) .rpm	Install RPM (-e~remove)
dpkg -get-selections	Installed pkgs (Obuntu)
dpkg -I '.deb	Install DEB (-r~remove)
pkginfo	Installed pkgs (Solaris)
which tscsh/csh/ksh/bash	Show location of executable
chmod -so tcsh/csh/ksh	Disable shell , force bash

Linux Utility Commands

Command	Description
wget http:// url -0 url.txt -o /dev/null	Grab url
rdesktop ip	Remote Desktop to ip
scp /tmp/file user@x.x.x.x:/tmp/file	Put file
scp user@ remoteip :/tmp/file /tmp/file	Get file
useradd -m user	Add user
passwd user	Change user password
rmuser unarne	Remove user
script -a outfile	Record shell : Ctrl-D stops
apropos subject	Find related command
history	View users command history
! num	Executes line # in history

Linux File Commands:

Command	Description
diff filel file2	Compare files
rm -rf dir	Force delete of dir
shred -f -u file	Overwrite/delete file
touch -r ref file file	t1atches ref_ file timestamp
touch -t YYYY11t1DDHHSS file	Set file timestamp
sudo fdisk -1	List connected drives
mount /dev/sda# /mnt/usbkey	t1ount USB key
md5sum -t file	Compute md5 hash
echo -n "str11 I md5sum	Generate md5 hash
shalsum file	SHAl hash of file
sort -u	Sort/show unique lines
grep -c ''str'' file	Count lines w/ ''str''
tar cf file.tar files	Create .tar from files
tar xf file.tar	Extract .tar
tar czf file.tar.gz files	Create .tar.gz
tar xzf file.tar.gz	Extract .tar.gz
tar cjf file.tar.bz2 files	Create .tar.bz2
tar xjf file.tar.bz2	Extract .tar.bz2
gzip file	Compress/rename file
gzip -d file. gz	Decompress file.gz
upx -9 -o out.exe orig.exe	UPX packs orig.exe
zip -r zipname.zip \Directory\'	Create zip
dd skip=lOOO count=2000 bs=S if=file of=file	Cut block 1K-3K from file
split -b 9K \ file prefix	Split file into 9K chunks
awk 'sub("$"."\r")' unix.txt win.txt	Win compatible txt file
find -i -name file -type '.pdf	Find PDF files
find I -perm -4000 -o -perm -2000 -exec ls -ldb {) \;	Search for setuid files
dos2unix file	Convert to ~nix format
file file	Determine file type/info
chattr (+/-)i file	Set/Unset immutable bit

Linus Misc Commands

Command	Description
unset HISTFILE	Disable history logging
ssh user@ ip arecord - I aplay -	Record remote mic
gee -o outfile myfile.c	Compile C,C++
init 6	Reboot (0 = shutdown)
cat /etc/ 1 syslog 1 .conf 1 grep -v ''"#''	List of log files
grep 'href=' file 1 cut -d"/" -f3 I grep url lsort -u	Strip links in url.com
dd if=/dev/urandom of= file bs=3145"28 count=lOO	Make random 311B file

Linux File System Structure

Command	Description
/bin	User binaries
/boot	Boot-up related files
/dev	Interface for system devices
/etc	Systern configuration files
/horne	Base directory for user files
/lib	Critical software libraries
/opt	Third party software
/proc	Systern and running programs
/root	Home directory of root user
/sbin	System administrator binaries
/trnp	Temporary files
/usr	Less critical files
/var	Variable Systern files

Linux Files

Command	Description
/etc/shadow	Local users' hashes
/etc/passwd	Local users
/etc/group	Local groups
/etc/rc.d	Startup services
/etc/init.d	Service
/etc/hosts	Known hostnames and IPs
/etc/HOSTNAl1E	Full hostnarne with domain
/etc/network/interfaces	Network configuration
/etc/profile	System environment variables
/etc/apt/sources.list	Ubuntu sources list
/etc/resolv.conf	Narneserver configuration
/horne/ user /.bash historj	Bash history (also /root/)
/usr/share/wireshark/rnanuf	Vendor-t1AC lookup
-/.ssh/	SSH keystore
/var/log	System log files (most Linux)
/var/adrn	System log files (Unix)
/var/spool/cron	List cron files
/var/log/apache/access.log	Apache connection log
/etc/fstab	Static file system info