pepstats outputs a report of simple protein sequence information such as molecular weight, number of residues, average residue weight, charge, isoelectric point, etc.

Here is a sample session with pepstats:

% pepstats
Protein statistics
Input sequence: sw:laci_ecoli
Output file [laci_ecoli.pepstats]:

Mandatory qualifiers:

[-sequencea] (sequence)

Sequence USA.

-outfile (outfile)

Output filename.

Advanced qualifiers:

-[no]termini (boolean)

Include charge at N and C termini.

-aadata (string)

Molecular weight data for amino acids.