bash insert a line at top of file code example

Example 1: bash add text to the beginning or end of every line

# Basic syntax:
awk '{print "PREFIX"$0}' input_file
# Prepend "PREFIX" to every row in the input_file
awk '{print $0"SUFFIX"}' input_file
# Append "SUFFIX" to every row in the input_file
awk '{print "PREFIX"$0"SUFFIX"}'
# Prepend "PREFIX" and append "SUFFIX" to every row in the input_file

Example 2: bash add comma to end of line

sed "s/$/,/g"