Re: [Help-bash] The best way to trim trailing .tiff or .tif?

[Greg Wooledge]

On Sun, Oct 21, 2012 at 11:42:20AM -0500, Peng Yu wrote:
> > if [[ $f = *.tiff ]]
> 
> Where is the above usage documented? I found the following for the man
> page, but I'm not sure which one documents it.

>        [[ expression ]]
>               Return a status of 0 or 1 depending on  the  evaluation  of  the
>               conditional  expression expression.  Expressions are composed of
>               the primaries described  below  under  CONDITIONAL  EXPRESSIONS.
>               Word  splitting  and pathname expansion are not performed on the
>               words between the [[ and  ]];  tilde  expansion,  parameter  and
>               variable  expansion, arithmetic expansion, command substitution,
>               process substitution, and quote removal are  performed.   Condi-
>               tional operators such as -f must be unquoted to be recognized as
>               primaries.

Keep reading a bit farther:

           When the == and != operators are used, the string to the right of
           the operator is considered a pattern and matched according to the
           rules described below under Pattern Matching.

The fact that = and == are equivalent in this context may not be
explicitly documented.