\begin{Schunk}
\begin{Sinput}
 ## the first 30 file names
 list.files(odir)[1:30]
\end{Sinput}
\begin{Soutput}
 [1] "histo-001.pdf" "histo-002.pdf" "histo-003.pdf"
 [4] "histo-004.pdf" "histo-005.pdf" "histo-006.pdf"
 [7] "histo-007.pdf" "histo-008.pdf" "histo-009.pdf"
[10] "histo-010.pdf" "histo-011.pdf" "histo-012.pdf"
[13] "histo-013.pdf" "histo-014.pdf" "histo-015.pdf"
[16] "histo-016.pdf" "histo-017.pdf" "histo-018.pdf"
[19] "histo-019.pdf" "histo-020.pdf" "histo-021.pdf"
[22] "histo-022.pdf" "histo-023.pdf" "histo-024.pdf"
[25] "histo-025.pdf" "histo-026.pdf" "histo-027.pdf"
[28] "histo-028.pdf" "histo-029.pdf" "histo-030.pdf"
\end{Soutput}
\end{Schunk}
