# Basic syntax using sed:
sed 's/..$//' input_file
# Where:
# - 's///' means 's/search_for/replace_with/'
# - '.' means any character
# - $ means end of the line
# Putting it together, this sed statement means: replace any two
# characters at the end of every line with nothing.
# Note, adapt this for your needs by changing the search pattern.
# E.g., by adding more '.'s, changing the search pattern, etc