Mike Gilbert wrote: > > [] is shorthand for test. Both test and [[]] in my man bash read: > > > > --8<-- > > Expressions are composed of the primaries described .. under > > CONDITIONAL EXPRESSIONS. > > -->8--
And the next sentence is exactly what you wrote. :) "Word splitting and pathname expansion are not performed on the words between the [[ and ]]" > Word splitting does not occur within double brackets. This is > documented in the bash manual. > > http://www.gnu.org/software/bash/manual/bashref.html#Conditional-Constructs > > This causes empty output from a command substitution within double > brackets to be treated as a zero-length string. Thanks for pointing me to the right place! //Peter
