I was having same issue and was getting same error but when I was running any command through directory where I have installed CDH, I was able to run all the commands - hadoop, hdfs, spark-shell ect.   e.g. if your CHD installation location is - /dat/anlt1/cld/cloudera/CDH-5.8.3-1.cdh5.8.3.p0.2/bin   you can test -   $ cd /dat/anlt1/cld/cloudera/CDH-5.8.3-1.cdh5.8.3.p0.2/bin   [root@xyz bin]# ./hadoop and if it work then you need to set up environment variable in your Unix master server   For RHEL -   [root@xyz~]# echo "$PATH" /usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin:/root/bin   [root@xyz~]# export PATH=$PATH:/path/to/CHD_Installation_bin_path   for me it's - /dat/anlt1/cld/cloudera/CDH-5.8.3-1.cdh5.8.3.p0.2/bin   [root@xyz~]# echo "$PATH"   /usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin:/root/bin:/dat/anlt1/cld/cloudera/CDH-5.8.3-1.cdh5.8.3.p0.2/bin   to make permanent change -   $ echo "export PATH=$PATH:/dat/anlt1/cld/cloudera/CDH-5.8.3-1.cdh5.8.3.p0.2/bin" >> /etc/profile   after that restart(reboot) your server. ... View more