bash - Using sort -M to sort by month -

bash - Using sort -M to sort by month -

i have file months.txt next text:

jan, mar, dec, feb, jun, apr

in bash write next line of code:

cat months.txt | sort -m

i assumed output text file, sorted month. output not sorted. using sort incorrectly?

sort sorts lines of text, , you've given one.

if file looked this:

jan mar dec feb jun apr

... you'd result expect.

incidentally, command useless utilize of cat: command

sort -m months.txt

does same thing.

bash sorting unix cat utilities