I converted some aiff files I added to iTunes and converted them to AAC. When I tried to "gain" them using the command-line [in Terminal] aacgain -r -k *.m4a I get the error that says " Can't open *.m4a for reading". The binary and the files are in the same directory. The m4a files are unprotected. What am I doing wrong?

I dont know for sure, but maybe aacgain dont accept wildcards ( * )?
Call the real filename instead.

I called it by the filename also before [thinking--same as you--that it won't accept wildcards] but I get the same error. All the files have the right priveleges, i.e., I can read and write to them. There's got to be a simple unix solution to this one.

Let's suppose that your filenames have spaces so you've to escape those spaces using \.



I hope it helps.

Cheers.