/Shell/Bash/Bash count duplicate lines in a file

Bash count duplicate lines in a file

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

Bash count duplicate lines in a file

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

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If the {string} part is omitted, it is considered as an empty string, and the matched pattern is deleted. The following command deletes all instances of the string ‘foo’ in the current line
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