What does `grep p2` do?

The command grep p2 is used to search for lines that contain the string "p2" in the input it receives.

Breakdown:

• grep: This is a command-line utility in Unix/Linux used for searching plain-text data for lines that match a specified pattern.
• p2: This is the pattern that grep is looking for in the input.

In Context:

In the command you provided:

lsblk -lno NAME /dev/sdb | grep p2

• lsblk -lno NAME /dev/sdb lists the names of the partitions on /dev/sdb.
• The output of lsblk is then piped (|) into grep p2, which filters that output to show only the lines that contain "p2".

Example:

If the output of lsblk includes:

sdb1
sdb2
sdb3
sdb4

And you run grep p2, the result would be:

sdb2

This means that grep p2 helps identify partitions that include "p2" in their names.