delete certain lines from a file in unix code example

Example 1: delete lines text file linux

sed -i '' '/pattern to match/d' ./infile

Example 2: bash how to delete a specific line from a file

# Basic syntax:
sed 'line#d' input_file
# Where line# is the line you want to delete from the input_file

# Example usage:
input_file contains:
this is
my favorite
line

sed '2d' input_file
--> this is
--> line