go-uniq

This is a solution to John Crickett's Coding Challenges Build Your Own uniq Tool in go.

This is a very basic implementation of the uniq command used in the shell on most *nix-like operating systems. It makes use of the flags go package for handling command line parameters

Building Locally

build the code with:

go build

this will create the uniq binary in your local directory.

Running

Getting Help

View command line options with ./uniq -h. This will output:

Usage: ./uniq [OPTIONS] [inputfile] [outputfile]
  -c	Count occurrences
  -count
    	Count occurrences
  -d	Print only repeated lines
  -repeated
    	Print only repeated lines
  -u	Print only unique lines
  -unique
    	Print only unique lines
  [inputfile] can either be the path to an input file or '-' for stdin
  [outputfile] can either be the path to an output file or '-' for stdout

Finding the unique lines in a file

You can find the unique lines in a file with:

./uniq ./testdata/test.txt

This will output:

line1
line2
line3
line4

You can also pipe input from stdin instead of specifying the filename with:

cat ./testdata/test.txt | ./uniq -

Finding the repeated lines in a file

You can find the repeated lines in a file with:

./uniq -d ./testdata/test.txt

This will output:

line2

You can find out how many times repeated lines occur in the file with:

./uniq -d -c ./testdata/test.txt

This will output:

2 line2