02-08-2007, Peter Samuelson: > > [Pierre Habouzit] >> the 3 biggest problems I've seen are: >>=20 >> * [[ for test, trivial: add it as a test alias, and also check for ]] >> termination in the test.c builtin. > > Ummm, [[ is not the same as [. (If they were the same, there would > have been no need to invent [[.) They behave quite differently with > regard to argument quoting. Try this in bash: > > unset foo > [ -n $foo ] && echo foo is non-empty > [[ -n $foo ]] && echo foo is non-empty > > As you can see, only the second one works.
Not quoting possible empty argument is a script writing bug. It's like dereferencing NULL pointer and must be shot away also. Supporting buggy scripting by inventing new tools is struggling with consequences not cause and is a very bad idea. BTW, i've provided patch in the BTS for dash's test built-in to have arithmetic checking of an empty argument and zero right. This was nearly a month ago, yet nothing happened. (Flaming about dash is easy, maintaining is not :) ____ -- To UNSUBSCRIBE, email to [EMAIL PROTECTED] with a subject of "unsubscribe". Trouble? Contact [EMAIL PROTECTED]
