Move errorlevel in For Statement

[drgt]

Code: Select all

for /f "usebackq delims=" %%i in (test.log) do move %%i "C:\path"
if errorlevel 1 goto zero
echo success
pause
exit
:zero
echo nothing to move
pause
exit

When test.log is 0 bytes (and maybe if cannot be found?) I would expect to see "nothing to move" BUT is not happening.
Why is that and how to modify?

[Squashman]

The DO commands never execute because the file is empty so the FOR command has nothing to parse.

[drgt]

I see.
So what is the workaround for the zero subroutine?

[aGerman]

There is modifier ~z of FOR variables which expands to the size of a file.
Using if exist ... you can check the existence of a file.

Code: Select all

@echo off &setlocal
set "file=xyz.txt"

set "isgood="
if exist "%file%" for %%i in ("%file%") do if %%~zi neq 0 set "isgood=1"

if defined isgood (echo OK) else echo not found or zero size
pause

Steffen

[Aacini]

You may use the trick described at end of this answer (under Table 5 - Commands or features that set the Exit Code):

Code: Select all

(for /f "usebackq delims=" %%i in (test.log) do move %%i "C:\path") || rem
if errorlevel 1 goto zero
echo success
pause
exit
:zero
echo nothing to move
pause
exit

Antonio

[drgt]

That is really a nice TRICK!

By the way, I thought the open parenthesis before "for" was a typo BUT IS REQUIRED for it to work correctly, otherwise it works like in post 1.

The DO commands never execute because the file is empty so the FOR command has nothing to parse.

On second thought, I would think that the "move nothing to target" would parse the errorlevel, and not the FOR...