Are you trying to read a file from stdin perhaps?

Please also try 1.5.0-alpha3 or my merge branch in github

On Mon, May 20, 2013 at 12:24 PM, Bryan Williams <> wrote:
    An unexpected error has occurred.
  Please report the following lines to:

Problem: IOError: [Errno 29] Illegal seek
S3cmd:   1.0.0

Traceback (most recent call last):
  File "/usr/bin/s3cmd", line 2006, in <module>
  File "/usr/bin/s3cmd", line 1950, in main
  File "/usr/bin/s3cmd", line 1211, in cmd_sync
    return cmd_sync_local2remote(args)
  File "/usr/bin/s3cmd", line 1180, in cmd_sync_local2remote
    response = s3.object_put(src, uri, extra_headers, extra_label = seq_label)
  File "/usr/share/s3cmd/S3/", line 277, in object_put
    response = self.send_file(request, file, labels)
  File "/usr/share/s3cmd/S3/", line 541, in send_file
IOError: [Errno 29] Illegal seek

    An unexpected error has occurred.
    Please report the above lines to:
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