cg_merge -V (return code: 1)
cg_merge: parsing --version
cg_merge: No such file or directory
cg_merge: Cannot open input file
cg_merge: near --version line 0
cg_merge -HELP (return code: 1)
cg_merge: Merges multiple cachegrind output files into one
cg_merge: usage: cg_merge [-o outfile] [files-to-merge]