Daniel Jacobowitz <drow@xxxxxxxxx> writes: > > $ a='a\b' > > $ expr "X$a" : 'X\(.*\)' > > a\b > > That's a neat trick, I didn't know it. Is this in the shell > portability guide? No, because some older version of expr can't handle arguments larger than 120 bytes (this is documented). > Note that all --enable, --with, and A=B options are > passed through echo and sed, at least as of the latest version I have > installed. Yes; autoconf doesn't support \ in file names.
