Enumeration

First Phase of any pen-testing involves enumeration.

Linux enumeration involves getting as much information as possible like hostname, linux version, release, user accounts, check the privilege of the user accounts, sudo permissions etc,

Command	Function
uname -a	Displays the kernel information and other information related to linux
hostname	Displays the hostname of the system
cat /etc/issue	Displays the linux issue version
cat /proc/version	Looking at /proc/version may give you information on the kernel version and additional data such as whether a compiler (e.g. GCC) is installed.
cat /etc/passwd	If the user has access then it will show the users present in the linux system.
sudo -l	The sudo -l command can be used to list all commands your user can run using sudo.
env	The env command will show environmental variables.
id	The id command will provide a general overview of the user’s privilege level and group memberships.
history	shows all the commands entered in the shell.
ifconfig or ip a	shows the ip add of the various interfaces
find / -perm -u=s -type f 2>/dev/null	shows the SUID files

If you have all this info then you are pretty much good to proceed to next page,