user@server:~/bin$ cat test.sh
#!/bin/bash

gs -sDEVICE=pdfwrite -q -dNOPAUSE -dBATCH -dNOSAFER -dPDFA \
   -dUseCIEColor -sProcessColorModel=DeviceCMYK \
   -sOutputFile=output.pdf PDFA_def.ps pdfmarks 2015_09_11_09_59_28.pdf

user@server:~/bin$ ./test.sh
Error: /undefinedfilename in --file--
Operand stack:
   --nostringval--   --nostringval--   (ISO Coated sb.icc)   (r)
Execution stack:
   %interp_exit   .runexec2   --nostringval--   --nostringval--   --nostringval--   2   %stopped_push   --nostringval--   --nostringval--   --nostringval--   false   1   %stopped_push   1916   1   3   %oparray_pop   1915   1   3   %oparray_pop   1899   1   3   %oparray_pop   1787   1   3   %oparray_pop   --nostringval--   %errorexec_pop   .runexec2   --nostringval--   --nostringval--   --nostringval--   2   %stopped_push   --nostringval--
Dictionary stack:
   --dict:1177/1684(ro)(G)--   --dict:0/20(G)--   --dict:78/200(L)--
Current allocation mode is local
Last OS error: No such file or directory
Current file position is 627
GPL Ghostscript 9.10: Unrecoverable error, exit code 1