-time lzop <file >/dev/null
-time gzip <file >/dev/null
-time bzip2 <file >/dev/null
-time xz <file >/dev/null
+time lzop >/dev/null <testfile
+time gzip >/dev/null <testfile
+time bzip2 >/dev/null <testfile
+time xz >/dev/null <testfile