Shell/Bash: bash only print duplicated lines Example

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Shell/Bash Example: This is the "bash only print duplicated lines" Example. compiled from many sources on the internet by SimpleTutorials.org

bash only print duplicated lines 

# Basic syntax:
sort input_file | uniq -d
# Sort the file first because uniq requires a sorted file to work

# Note, uniq -d only prints one instance of lines that have duplicates
#	Use, uniq -c to count the number of duplicates in the file


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