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Sort and count number of occurrence of lines uniq options: -c, --count prefix lines by the number of occurrences sort options: -n, --numeric-sort compare according to string numerical value -r, --reverse reverse the result of comparisons In the particular case were the lines you are sorting are numbers, you need use sort -gr instead of sort -nr, see comment
How to print only the duplicate values from a text file? You can use uniq(1) for this if the file is sorted: uniq -d file txt If the file is not sorted, run it through sort(1) first: sort file txt | uniq -d This will print out the duplicates only Technically the input does not need to be in sorted order, but the duplicates in the file need to be consecutive The usual way to achieve that is to sort the file
Difference between sort -u and uniq -u - Unix Linux Stack Exchange The question is: is the output of sort -u |wc the same as uniq -u |wc? Because they don't yield the same results The manual for uniq specifies: -u, --unique only print unique lines My output consists of 1110 words for which sort -u keeps 1020 lines and uniq -u 1110 lines, the correct amount
Difference between using `sort -u` and `sort | uniq -u` The title and the body ask two different questions sort | uniq is the same as sort -u, and sort | uniq -u is explicitly asking for a totally different behaviour; which one do you care about?
uniq - How do I count the occurrences in a list, and then sort by . . . You're just missing a sort -b -n at the end of the pipeline (as another stage of it): awk '{ print $5 }' FILE | sort | uniq -c | sort -b -n sort -b -n will sort the lines produced by the earlier stages of the pipeline numerically (ignoring leading blanks) If two lines has the same number at the start, a lexicographical ordering of the lines will be performed
How is uniq not unique enough that there is also uniq --unique? 47 Short version: uniq, without -u, makes every line of the output unique uniq -u only prints every unique line from the input Slightly longer version: uniq is for dealing with files that have lines duplicated, and only when those lines appear successively in the input So, for its purposes, a unique line is one that is not duplicated
Difference between cat file. txt | sort -u and cat file. txt | uniq 5 Strictly speaking, uniq doesn't need sorted input - but it is true that uniq will only remove consecutive duplicate lines The difference is that: sort sorts a file and (using its -u option) can also eliminate duplicate lines, which will now all be consecutive as they have been sorted uniq deletes consecutive duplicate lines