karls-mac-mini:monks karl$ for i in {0..9}; do echo $i; done | perl -pe '$_++'
12345678910karls-mac-mini:monks karl$

##</code><code>##

karls-mac-mini:monks karl$ for i in {0..9}; do echo $i; done | perl -ne '$_++; print qq($_\n)'
1
2
3
4
5
6
7
8
9
10