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- What is the difference between sort -u and sort | uniq?
With POSIX compliant sorts and uniqs (GNU uniq is currently not compliant in that regard), there's a difference in that sort uses the locale's collating algorithm to compare strings (will typically use strcoll() to compare strings) while uniq checks for byte-value identity (will typically use strcmp())¹ That matters for at least two reasons
- Difference between using `sort -u` and `sort | uniq -u`
sort -u and sort | uniq do produce the same output*: all of the lines in the input, exactly once each, in ascending order That is the default behaviour of uniq uniq -u, on the other hand, asks to:-u Suppress the writing of lines that are repeated in the input This is a very different behaviour: only the lines that do not repeat are outputted
- What is the point of uniq -u and what does it do? [duplicate]
NAME uniq - report or omit repeated lines DESCRIPTION With no options, matching lines are merged to the first occurrence -u, --unique only print unique lines If we try it out we see: $ cat file cat dog dog bird $ uniq file cat dog bird $ uniq -u file cat bird You can see that uniq prints the first instance of a duplicated line
- How is uniq not unique enough that there is also uniq --unique?
uniq with -u skips any lines that have duplicates Thus: $ printf "%s\n" 1 1 2 3 | uniq 1 2 3 $ printf "%s\n" 1 1 2 3 | uniq -u 2 3 Usually, uniq prints lines at most once (assuming sorted input) This option actually prints lines which are truly unique (having not appeared again)
- Difference between sort -u and uniq -u - Unix Linux Stack Exchange
My output consists of 1110 words for which sort -u keeps 1020 lines and uniq -u 1110 lines, the correct amount The issue is that I cannot visually spot any duplicates on the list which is generated by using > at the end of the command line, and that there IS an issue with the total cracked passwords (in the context of customizing john the ripper)
- Sort and count number of occurrence of lines
| sort | uniq -c As stated in the comments Piping the output into sort organises the output into alphabetical numerical order This is a requirement because uniq only matches on repeated lines, ie a b a If you use uniq on this text file, it will return the following: a b a
- Uniq based on last field, keeping last line, and append number of . . .
uniq -c -f 2 only compares the last field by skipping the first two with -f 2 It prepends the number of duplicated lines with the -c flag, so we have to transfer the count number to the last field That is what awk '{$(NF+1)=$1;$1=""}1' does
- uniq -i is does not ignore case-sensitive in non-Ascii characters
$ uniq -ic a txt 2 A 2 B 1 Ş 1 ş How can I solve the non-ascii character problem with uniq? here is my
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