（1）统计当前目录下的 *txt 文件
du -c -h *txt
（2）统计当前目录下的 *txt 文件, 并求出总大小
du *txt |awk 'BEGIN{count=0;size=0;} \
{count = count + 1; size = size + $1/1024;} \
END{print "Total count " count; \
print "Total size " size/1024 " GB" ; \
print "Avg size " size / count "MB"}'（3）统计当前目录下及其子目录中的 +1000000k 文件
find . -size +1000000k -exec ls -l {} \; |awk 'BEGIN{count=0;size=0;} \
{count = count + 1; size = size + $5/1024/1024;} \
END{print "Total count " count; \
print "Total Size " size/1024 " GB" ; \
print "Avg Size " size / count "MB"; \
print "—"}'
（4）统计当前目录下及其子目录中的 *.fastq
find . -name '*.fastq' -exec ls -l {} \; |awk 'BEGIN{count=0;size=0;} \
{count = count + 1; size = size + $5/1024/1024;} \
END{print "Total count " count; \
print "Total Size " size/1024 " GB" ; \
print "Avg Size " size / count "MB"; \
print "—"}'（5）统计当前目录下及其子目录中的之前2天的文件
find . -mtime -2 -exec ls -l {} \; |awk 'BEGIN{count=0;size=0;} \
{count = count + 1; size = size + $5/1024/1024;} \
END{print "Total count " count; \
print "Total Size " size/1024 " GB" ; \
print "Avg Size " size / count "MB"; \
print "—"}'