I just realised I can use xargs to quickly turn a list of items into a horizontal list for further use on the command line. Well of course that’s the fundamental purpose of xargs, but with echo I can do it without having xargs execute the actual command in question.
i.e.
cat my.csv | cut -d, -f 2 | xargs echo
Can take a column from a csv and turn it into a horizontal list, like,
12354 32132 77632 09211 99321
to
12354 32132 77632 09211 99321
Kind of a no brainer when you think about it, if only I thought of it more often.
The Dumping Ground 
I’m always using shell to flatten lists 🙂
$ echo `cut -d, -f 2 my.csv`
another common idiom…
$ for i in `cut -d, -f 2 my.csv`; do stuff $i; done