“在Mac OSX（ML）的zsh上预期的条件：<”

Question

I'm learning shell scripts on the zsh on Mac OSX(ML).

When tring

test good \< bad

it gives

zsh: condition expected: <

Can anyone explain this?

Answer 1

Can you not just use flags to test?

% test 1 -lt 2 && echo 'it\'s less! yay!'
% test 1 -gt 2 && echo 'ohnoes, math is broken'

Incidentally, using your test here, 'test 1 \\< 2' works in bash and fails in zsh . Looking at the zsh docs ( zshbuiltin among others), it seems that < is in fact the right operator for less than, but go ahead and use the -lt and -gt . If you must use the left angle bracket, use this syntax:

% [[ 1 < 2 ]] && echo 'hooray for angle brackets!'

which seems to work on my zsh, which is zsh 4.3.11 (i386-apple-darwin12.0) .