The default output of multiBamSummary (a compressed numpy array: *.npz) can be visualized using plotCorrelation or plotPCA.
The optional output (--outRawCounts) is a simple tab-delimited file that can be used with any other program. The first three columns define the region of the genome for which the reads were summarized.
$ deepTools2.0/bin/multiBamSummary bins \
--bamfiles testFiles/*bam \ # using all BAM files in the folder
--minMappingQuality 30 \
--region 19 \ # limiting the binning of the genome to chromosome 19
--labels H3K27me3 H3K4me1 H3K4me3 HeK9me3 input \
-out readCounts.npz --outRawCounts readCounts.tab
$ head readCounts.tab
#'chr' 'start' 'end' 'H3K27me3' 'H3K4me1' 'H3K4me3' 'HeK9me3' 'input'
19 10000 20000 0.0 0.0 0.0 0.0 0.0
19 20000 30000 0.0 0.0 0.0 0.0 0.0
19 30000 40000 0.0 0.0 0.0 0.0 0.0
19 40000 50000 0.0 0.0 0.0 0.0 0.0
19 50000 60000 0.0 0.0 0.0 0.0 0.0
19 60000 70000 1.0 1.0 0.0 0.0 1.0
19 70000 80000 0.0 1.0 7.0 0.0 1.0
19 80000 90000 15.0 0.0 0.0 6.0 4.0
19 90000 100000 73.0 7.0 4.0 16.0 5.0