How to? Abort on error DO loop

[samintz]

If I have a command line DO that is operating on a list is it possible to abort the DO if the command errors?
E.g.

do f in /l a b c (somecommand %f)

If somecommand errors while working on a or b, I'd like the DO to stop and not even try c.

 

[Charles Dye]

Does 'somecommand' return a nonzero exit code when it fails?

 

[vefatica]

Does 'somecommand' return a nonzero exit code when it fails?

That doesn't seem to matter (see below). I thought maybe you could do it manually by looking at _DO_ERRORS, but no. What kind of errors does _DO_ERRORS count?

v:\> do z in /L xx yy ( dir %z & echo %_? %_do_errors)

 Volume in drive V is DATA         Serial number is 6e8a:6d1f
TCC: (Sys) The system cannot find the file specified.
 "V:\xx"
                   0 bytes in 0 files and 0 dirs
     492,625,555,456 bytes free
2 0

 Volume in drive V is DATA         Serial number is 6e8a:6d1f
TCC: (Sys) The system cannot find the file specified.
 "V:\yy"
                   0 bytes in 0 files and 0 dirs
     492,625,555,456 bytes free
2 0

You can force it:

v:\> do z in /L xx yy ( dir %z & if %_? != 0 leave )

 Volume in drive V is DATA         Serial number is 6e8a:6d1f
TCC: (Sys) The system cannot find the file specified.
 "V:\xx"
                   0 bytes in 0 files and 0 dirs
     492,625,555,456 bytes free

v:\> do z in /L xx yy ( grep foo %z & if %? != 0 leave )
grep: xx: No such file or directory

v:\>

 

[Charles Dye]

v:\> do z in /L xx yy ( dir %z & if %_? != 0 leave )

Or, a bit shorter, do z in /L xx yy ( dir %z || leave )

 

[vefatica]

Or, a bit shorter, do z in /L xx yy ( dir %z || leave )

Yeah! I like that.

I can't get _DO_ERRORS to be other than 0. Anyone else?

Charles, what's "icode" (something new)? It looks nice in your post and not so nice when I quote you.

 

[vefatica]

OK, found it (icode). It looks OK after I post. Quoting your icode didn't look good in the editor.

 

[Charles Dye]

Inline code, I think. Don't remember where I found that.

 

[vefatica]

Inline code, I think. Don't remember where I found that.

It's on the first of the (...) "more options" menus.

 

[samintz]

Or, a bit shorter, do z in /L xx yy ( dir %z || leave )

Nifty. That's a useful tip.

 

[rconn]

That doesn't seem to matter (see below). I thought maybe you could do it manually by looking at _DO_ERRORS, but no. What kind of errors does _DO_ERRORS count?

_do_errors is incremented on DO syntax errors (like a DO UNTIL that's missing the final argument).

 

[vefatica]

_do_errors is incremented on DO syntax errors (like a DO UNTIL that's missing the final argument).

Can you give an example? I can't get _DO_ERRORS to be anything but 0.