break;
case 'y':
- /* Accept and ignore e.g. -y0 for compatibility with Solaris
- 2.x through Solaris 7. -y is marked as obsolete starting
- with Solaris 8. */
+ /* Accept and ignore e.g. -y0 for compatibility with Solaris 2.x
+ through Solaris 7. It is also accepted by many non-Solaris
+ "sort" implementations, e.g., AIX 5.2, HP-UX 11i v2, IRIX 6.5.
+ -y is marked as obsolete starting with Solaris 8 (1999), but is
+ still accepted as of Solaris 10 prerelease (2004).
+
+ Solaris 2.5.1 "sort -y 100" reads the input file "100", but
+ emulate Solaris 8 and 9 "sort -y 100" which ignores the "100",
+ and which in general ignores the argument after "-y" if it
+ consists entirely of digits (it can even be empty). */
+ if (!optarg && optind != argc)
+ {
+ char const *p;
+ for (p = argv[optind]; ISDIGIT (*p); p++)
+ continue;
+ optind += !*p;
+ }
break;
case 'z':