Centos 6 安装tree命令
sudo yum -y install tree
测试是否成功：
(py36) [root@bigData projects]# tree gatk4-germline-snps-indels-master/
gatk4-germline-snps-indels-master/
├── generic.google-papi.options.json
├── haplotypecaller-gvcf-gatk4.hg38.wgs.inputs.json
├── haplotypecaller-gvcf-gatk4.wdl
├── JointGenotyping.hg19.wgs.inputs.json
├── JointGenotyping.hg38.terra.wgs.inputs.json
├── JointGenotyping.hg38.wgs.inputs.json
├── JointGenotyping-terra.wdl
├── JointGenotyping.wdl
├── LICENSE
├── README.md
└── tasks
├── JointGenotypingTasks-terra.wdl
└── JointGenotypingTasks.wdl
