Description of problem:

Tilda expansion fails to take place under certain conditions

Version-Release number of selected component (if applicable):

ksh-20100621-5.el5


How reproducible:

Always


Steps to Reproduce:
1.  create the following script:  (here ~root/bin/date is just a copy of 
    bin/date)

    #!/usr/bin/ksh
    echo $(~root/bin/date)
    ~root/bin/date

2.  Execute the script

Actual results:

The first line prints the date, the second line prints an error because ~root is not getting expanded:

/tmp/ksh.bug[3]: ~root/bin/date: not found [No such file or directory]


Expected results:

Both lines should print the date.




Additional info:

If the second line is commented out, then tilda expansion correctly takes place in the third line and the date is printed.


RHEL 5.8 has ksh93t+.  The bug is also showing up in ksh93u+ and AT&T gave me this patch for 93u+:

--- .../sh/macro.c      Tue Feb  7 09:56:20 2012
+++ sh/macro.c  Fri Mar  9 15:58:54 2012
@@ -2700,7 +2700,12 @@
        if(!logins_tree)
                logins_tree = dtopen(&_Nvdisc,Dtbag);
        if(np=nv_search(string,logins_tree,NV_ADD))
+       {
+               c = shp->subshell;
+               shp->subshell = 0;
                nv_putval(np, pw->pw_dir,0);
+               shp->subshell = c;
+       }
        return(pw->pw_dir);
 }