BASH General

Question 1

How to check OS and version using a Linux command

Answer 1

all info: uname -a

os name: uname -o

Question 2

Inode number also called as index number - what info does it consist?

Answer 2

File types ( executable, block special etc )
Permissions ( read, write etc )
UID ( Owner )
GID ( Group )
FileSize
Time stamps including last access, last modification and last inode number change.
File deletion time
Number of links ( soft/hard )
Location of ile on harddisk.
Some other metadata about file.

Question 3

What command shall we use to identify whether a command is built-in or external

Answer 3

$ type echo
echo is a shell builtin

$ type ifconfig
ifconfig is /sbin/ifconfig

$ type type
type is a shell builtin