Ubuntu Linux has a great tool called shuf, which works like head except that it gives you ten random lines. I couldn't find it on Homebrew. What is the simplest way of installing it on OS X?
2It’s part of the gnu text utilities package. Seems to be part of coreutils, but I don’t know how stuff is packaged on homebrew.– jl8eAug 22, 2014 at 16:25
You can install coreutils with
brew install coreutils.
shuf will be linked as
gshuf. Read the caveats when you install coreutils.
2The caveat just seems to be that you shouldn't use the tools' proper names, but prefix them with g (like "gshuf"), right? Aug 22, 2014 at 16:35
2Yep, or optionally configure your PATH so you get what you expect. Aug 22, 2014 at 16:39
brew install coreutilsinstalls the utils with the prefix
gby default on osx, so you can install it using the above command. Jun 17, 2015 at 13:37
1Mac OS X Catalina 10.15+, with bash enabled as the shell, does install the
shufcommand along with
gshuf.– rjurneyJan 23, 2020 at 19:20
Yet another solution is to learn about the tools supplied by the vendor. Certainly you could chain
head and get the same results.
jot -r "$(wc -l FILE)" 1 | paste - FILE | sort -n | cut -f 2- | head -n 10
- jot produces a random number from 1 to the number of lines in FILE for each line
- paste pastes the random number to each line in FILE
- sort sorts numeric each line
- cut removes the random number from each line
- head outputs the first 10 lines
2I really like the essence of this answer, you never know when you might want to do the same thing on another machine where you aren't able to install extra tools for whatever reason– forquareAug 7, 2015 at 21:02
1I had never heard about
jotbefore. Thanks for expanding my knowledge. Feb 7, 2018 at 11:16
While this answer kind of works, by default jot doesn't generate that much randomness, in the current version it seems like it only generates integers from 1 to 100, so while this will give you a different ordering of lines, it will be far from the uniform ordering you'd get from
shuf– ErikSep 20, 2020 at 14:41
You can install coreutils with Macports as
sudo port install coreutils
This will put GNU core utils in /opt/local/bin with a g prepended
More details on the package coreutils.
2I used this one with macports, thanks. I don't like Homebrew much Aug 7, 2015 at 10:22
Great answer if you have sudo rights. I don't. Feb 7, 2018 at 12:48
@tommy.carstensen Then ask your admin - they will have made it difficult for you to do this for a reason– mmmmmmFeb 7, 2018 at 14:33
You can use
$ seq 5 | sort -R 2 3 4 1 5
2Good answer, and works for both BSD and GNU
sort.– msbitNov 12, 2021 at 3:38
Another option is to install
randomize-lines(homebrew) package, which has an
rl command which has similar functionality to shuf.
Usage: rl [OPTION]... [FILE]... Randomize the lines of a file (or stdin). -c, --count=N select N lines from the file -r, --reselect lines may be selected multiple times -o, --output=FILE send output to file -d, --delimiter=DELIM specify line delimiter (one character) -0, --null set line delimiter to null character (useful with find -print0) -n, --line-number print line number with output lines -q, --quiet, --silent do not output any errors or warnings -h, --help display this help and exit -V, --version output version information and exit