Question: when i use the gun wget (version 1.13) to fetch a file list like this:

```
cat url.txt | xargs wget -c -P ../data/

```

Then, I get the exit code 123, what does it means?

thx:)

Answer: 
`123` is an exit code from `xargs` - one or more invocation of the command failed with an error code in the range 1-125. It means your `wget` command failed, but doesn't tell you why.
Try something like this just to see the lines that pose a problem :

```
while read; do wget -c -P ../data/ "$REPLY"; done < url.txt

```