Useful linux commands when you have a shell

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