Everyone knows: cheat sheets are cool! They are very useful if you already know the basics about a topic but you have to look up details when you are not sure about something.
Especially, if you are new to a certain topic and you have to learn a lot of new stuff, it’s sometimes very hard to memorize everything.
Linux Network Commands
Command Descriptions
watch ss -tp Network Connections
netstat -ant Tcp Connections -anu=udp
netstat -tulpn Connection with PIDs
lsof -i Established connections
smb://<ip>/share Access windows smb share
share user x.x.x.x c$ Mount Windows share
smbclient -U user \\\\<ip>\\<share> SMB connect
ifconfig eth# <ip>/<cidr> Set IP and netmask
route add default gw <gw_ip> Set GW
ifconfig eth# mtu [size] Change MTU size
export MAC=xx:xx:xx:xx:xx:xx change MAC
ifconfig <int> hw ether <MAC> change Mac
macchanger -m <MAC> <int> kali Mac changer
iwlist <int> scan Built-in wifi scanner
dig -x <ip> Domain lookup for ip
host <ip> Domain lookup for ip
host -t SRV _<server>_tcp.url.com Domain SRV lookup
dig @<ip> domain -t AXFR DNS Zone Xfer
host -l <domain> <namesvr> DNS Zone Xfer
ip xfrm state list Print existing VPN keys
ip addr add <ip>/<cidr> dev eth0 Adds 'hidden' interface
/var/log/messages | grep DHCP List DHCP assignments
tcpkill host <ip> and port <port> Block ip:port
echo "l" > /proc/sys/net/ipv4/ip_forward Turn on IP Forwarding
echo "nameserver x.x.x.x" > /etc/resolv.conf Add DNS server
Linux SYSTEM INFO
Command Descriptions
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 Mounted file systems
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 --query -all Installed pkgs (Redhat)
rpm -ivh * .rpm Install RPM (-e=remove)
dpkg -get-selections Installed pkgs (ubuntu)
dpkg -I *.deb Install DEB (-r=remove)
pkginfo Installed pkgs (Solaris)
which <tscsh/csh/ksh/bash> Show location of executabe
chmod 750 <tcsh/csh/ksh> Disable <shell>, force bash
Linux UTILITY COMMANDS
Linux UTILITY COMMANDS
Command Descriptions
wget http://<url> -O 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 User information
useradd -m <user> Add user
passwd <user> Change user password
rmuser uname Remove user
script -a <outfile> Record shell : Ctrl-D stops
apropos <subject> Find related command
history View users command history
!<num> Executes line # in historyLinux FILE COMMANDS
Command Descriptions
diff file1 file2 Compare file
rm -rf <dir> Force delete of <dir>
shred -f -u <file> Overwrite/delete file
touch -r <ref_file> <file> Matches ref_file timestamp
touch -t YYYYMMDDHHSS <file> Set file timestamp
sudo fdisk -l List connected drives
mount /dev/sda# /mnt/usbkey Mount USB Key
md5sum -t file Compute md5 hash
echo -n "str" | md5sum Generate md5 hash
shalsum file SHA1 hash of file
sort -u Sort/show unique lines
grep -c "str" file Count lines w/ "str"
tar cf file.tar files Creat .tar from files
tar xf file.tar Extract .tar
tar czf file.tar.gz files Creat .tar.gz
tar xzf file.tar.gz Extract .tar.gz
tar cjf file.tar.bz2 files Creat .tar.bz2
tar xjf file.tar.bz2 Extract .tar.bz2
gzip file Cmpress/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\* Creat zip
dd skip=1000 count=2000 bs=8 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 / -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
