uniq(1) General Commands Manual uniq(1) NAME uniq - Report or omit repeated lines. SYNOPSIS uniq [-D|--all-repeated] [--group] [-w|--check-chars] [-c|--count] [-i|--ignore-case] [-d|--repeated] [-s|--skip-chars] [-f|--skip-fields] [-u|--unique] [-z|--zero-terminated] [-h|--help] [-V|--version] [files] DESCRIPTION Report or omit repeated lines. OPTIONS -D, --all-repeated=delimit-method print all duplicate lines. Delimiting is done with blank lines. [default: none] [possible values: none, prepend, separate] --group=group-method show all items, separating groups with an empty line. [default: separate] [possible values: separate, prepend, append, both] -w, --check-chars=N compare no more than N characters in lines -c, --count prefix lines by the number of occurrences -i, --ignore-case ignore differences in case when comparing -d, --repeated only print duplicate lines -s, --skip-chars=N avoid comparing the first N characters -f, --skip-fields=N avoid comparing the first N fields -u, --unique only print unique lines -z, --zero-terminated end lines with 0 byte, not newline -h, --help Print help -V, --version Print version EXTRA Filter adjacent matching lines from INPUT (or standard input), writing to OUTPUT (or standard output). Note: uniq does not detect repeated lines unless they are adjacent. You may want to sort the input first, or use sort -u without uniq. VERSION v0.0.26 uniq 0.0.26 uniq(1)