The CAT command in Linux is helpful in creating text files, displaying their contents, concatenating text from two or more text files into a new file. We can also append text from terminal to a file or append text to an existing file.

Create a new file

cat > newfile.txt

Concatenating multiple

The xargs command transforms standard input into a sequence of arguments for another command xargs reads items from the standard input, delimited by blanks (which can be protected with double or single quotes or a backslash) or newlines, and executes the command (default is echo) one or more times w...

At certain times, it is necessary to duplicate a single file across various locations on our system. There is no need to use the cp command repeatedly.

echo [destination1] [destination2] [destination3]..... | xargs -n 1 cp [/location/samplefile]

The echo command is used to feed the xargs comman...

The ip command is used to display or configure networking and to assign an address to a network interface on Linux operating systems. It replaces the ifconfig command now deprecated.

list all network interfaces and show all ip address associated

 ip a
or
ip addr

to specify one interface :

...

Renew IP using dhclient

Suppose our network interface is eth0 :

 sudo dhclient -v -r eth0

using ifup and ifdown

sudo ifdown eth0
sudo ifup eth0

using systemd

 sudo /etc/init.d/networking restart 
 or
 sudo systemctl restart network.service