See this page for more details about HDFS Commands:
https://hadoop.apache.org/docs/r3.1.2/hadoop-project-dist/hadoop-hdfs/HDFSCommands.html

Usage: hdfs [OPTIONS] SUBCOMMAND [SUB-SUBCOMMAND OPTIONS]

OPTIONS is none or any of the options listed bellow.
SUBCOMMAND is one of the subcommands listed bellow.
SUBCOMMAND print help (as listed bellow) when invoked without parameters or with "-help" parameter: hdfs --help.

--help usage information --buildpaths attempt to add class files from build tree --config dir Hadoop config directory --daemon (start|status|stop) operate on a daemon --hostnames list[,of,host,names] hosts to use in worker mode --hosts filename list of hosts to use in worker mode --debug turn on shell script debug mode --loglevel level set the log4j level for this command --workers turn on worker mode

dfsadmin run a DFS admin client cacheadmin configure the HDFS cache crypto configure HDFS encryption zones debug run a Debug Admin to execute HDFS debug commands dfsrouteradmin manage Router-based federation ec run a HDFS ErasureCoding CLI fsck run a DFS filesystem checking utility haadmin run a DFS HA admin client jmxget get JMX exported values from NameNode or DataNode. oev apply the offline edits viewer to an edits file oiv apply the offline fsimage viewer to an fsimage oiv_legacy apply the offline fsimage viewer to a legacy fsimage storagepolicies list/get/set block storage policies

dfs run a filesystem command on the file system version print the version classpath prints the class path needed to get the hadoop jar and the required libraries envvars display computed Hadoop environment variables fetchdt fetch a delegation token from the NameNode getconf get config values from configuration groups get the groups which users belong to lsSnapshottableDir list all snapshottable dirs owned by the current user snapshotDiff diff two snapshots of a directory or diff the current directory contents with a snapshot

datanode run a DFS datanode namenode run the DFS namenode secondarynamenode run the DFS secondary namenode journalnode run the DFS journalnode dfsrouter run the DFS router balancer run a cluster balancing utility diskbalancer Distributes data evenly among disks on a given node httpfs run HttpFS server, the HDFS HTTP Gateway mover run a utility to move block replicas across storage types nfs3 run an NFS version 3 gateway portmap run a portmap service zkfc run the ZK Failover Controller daemon