Today I Learned about /bin/[

Once I saw in /bin a file [. Since I don’t want to destroy the fabric of my little unixiverse I thought: Maybe some leftover of some command gone wrong or whatever. I did a ¯\_(ツ)_/¯ and moved on.

Today I learned:

When you write a script like this:

if [ a = b ]; then
	echo "a equal to b"

You don’t use a language built in expression. You run with the executable /bin/test. Because /bin/[ is an alias for /bin/test. The only difference is that [ looks for the closing ] to even things out.

So the script above could also be :

if test a = b; then
	echo "a equal to b"


source: via Hacker News