问题
I have this weird issue, I can't understand why is happening. It should be a piece of cake for any bash ninja.
OPTIONS="-auto -batch -ignore 'Path one' -ignore 'Path two' -ignore 'Path three'"
unison $OPTIONS a b
I expected this to be translated as...
unison -auto -batch -ignore 'Path one' -ignore 'Path two' -ignore 'Path three' a b
...and just work. But it doesn't. When running the full command, I have no problems, unison is ok with that. But when I run the command unison $OPTIONS a b, unison complains:
Usage: unison [options]
or unison root1 root2 [options]
or unison profilename [options]
For a list of options, type "unison -help".
For a tutorial on basic usage, type "unison -doc tutorial".
For other documentation, type "unison -doc topics".
unison was invoked incorrectly (too many roots)
What am I doing wrong?
回答1:
BASH FAQ entry #50: "I'm trying to put a command in a variable, but the complex cases always fail!"
options=(-auto -batch -ignore 'Path one' ...)
unison "${options[@]}" a b
来源：https://stackoverflow.com/questions/14564250/bash-command-quoting-issue