Adding Users and Groups - usermod man page

"screen" can manage long-lived sessions via SSH

One-liner to remove an incorrect entry in the SSH known_hosts file

Symbolic links

Tar Command Examples

Verifying Which Ports Are Listening

Installing Maven on CentOS

Simplifying Your Life With an SSH Config File

18 Tar Command Examples in Linux

A collection of Unix/Linux find command examples

rsync examples

How To Set Up and Use Yum Repositories on a CentOS 6 VPS

Installing/Updating NTP Service on CentOS

OS X Mavericks and Apache

Linux Performance Analysis in 60,000 Milliseconds

Secure Copy

scp sourceFile destinationFile where the "files" use the following convention if they are remote; user@host:file

example of copying a remote file to the current (local) directory; scp hdpdemo@hdp-demo-data9.cloudapp.net:/usr/hdp/current/hadoop-client/hadoop-common.jar .

Services

Stop/Start/Restart services; see example for MySQL at http://theos.in/desktop-linux/tip-that-matters/how-do-i-restart-mysql-server/
- Good help with failures for MySQL start up at http://stackoverflow.com/questions/20407292/centos-another-mysql-daemon-already-running-with-the-same-unix-socket
Check/List running services

Removing a string from the front of all files names (ex: maybe you have Photo_9999.jpg looking file names) in current directory

rename "Photo_" "" *

Content labeled with "linux"

Blog:
NoClassDefFoundError for Log4jLoggerFactory on hdp 2.5.3 when running the KafkaSpout in your topology? (how's that for a title?) (Lester Martin)
Blog:
opening up a port on centos 7 firewall (using firewalld) (Lester Martin)
Blog:
unboxing my new little box (my first intel nuc) (Lester Martin)
- ubuntu
- linux
Blog:
performing a non-root ambari install (with hortonworks admin 1 course) (Lester Martin)
Blog:
hadoop mount points (more art than science) (Lester Martin)
Blog:
trying out hive testbench on hdp sandbox (and packaging it up for deployment elsewhere) (Lester Martin)
Blog:
installing hdp 2.2 with ambari 2.0 (moving to the amazon cloud) (Lester Martin)
Blog:
installing hdp 2.2 with ambari 2.0 (moving to the azure cloud) (Lester Martin)
Blog:
os patching your hadoop cluster (pre & post rolling upgrades) (Lester Martin)
Blog:
a lightning quick tutorial on pdsh (for when you need to run the same command on many machines) (Lester Martin)
Blog:
simple hadoop cluster user provisioning process (simple = w/o pam or kerberos) (Lester Martin)
Blog:
hadoop worker node configuration recommendations (1-2-10) (Lester Martin)
Blog:
hadoop superuser (you can have more than 'hdfs') (Lester Martin)
Page:
Linux Cheat Sheet (Lester Martin)

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