{"id":4798,"date":"2015-05-18T15:20:50","date_gmt":"2015-05-18T13:20:50","guid":{"rendered":"https:\/\/www.dbi-services.com\/blog\/tmux-an-alternative-to-screen\/"},"modified":"2015-05-18T15:20:50","modified_gmt":"2015-05-18T13:20:50","slug":"tmux-an-alternative-to-screen","status":"publish","type":"post","link":"https:\/\/www.dbi-services.com\/blog\/tmux-an-alternative-to-screen\/","title":{"rendered":"tmux – an alternative to screen"},"content":{"rendered":"

You may already use screen<\/a> for multiplexing a terminal. This is especially useful when you want to start long running processes on a server and do not want to loose the connection because of a ssh connection timeout, firewall settings or other reasons. With screen the session keeps running even if you got disconnected somehow and you may re-attach to the screen session at any point later.<\/p>\n

In this post I want to make you aware of another tool that does the same thing. It is called tmux<\/a> and available for the most Linux\/Unix platforms. Installation is straight forward and easy:<\/p>\n

For debian based distributions:
\napt-get install tmux<\/p>\n

For redhat based distributions:
\nyum install tmux<\/p>\n

Imagine you have an oracle database running on a server and you want to perform several tasks without the risk of loosing the connection. With tmux this becomes very easy:
\nOpen a new tmux session:
\ntmux<\/p>\n

You will be immediately connected to it. In this session do whatever you want, e.g. tailing the oracle alert.log: \"Selection_066.png\"<\/a>\"Selection_067.png\"<\/a>
\nIn another session you now want to do a restart of the database. In tmux you can horizontally split the screen by hitting
\nCTRL-B ”<\/p>\n

on the keyboard. Now you can do the restart of the database and watch the alert.log in the same session: \"Selection_068.png\"<\/a>
\nLets say you now want another screen for running top. No problem: Hitting
\nCTRL-B %<\/p>\n

will split the screen vertically and you can now run top:
\n\"Selection_069.png\"<\/a><\/p>\n

You can add as many screens as you want. Cycling through the screens is done by
\nCTRL-B<\/p>\n

and one of the up\/down\/left\/right arrow keyboard keys. Detaching from the screen is done by
\nCTRL-B d<\/p>\n

\"Selection_070.png\"<\/a><\/p>\n

For re-attaching just type:
\ntmux attach<\/p>\n

… and everything will be back.
\n\"Selection_071.png\"<\/a>
\nThe man page for tmux is here<\/a>.<\/p>\n","protected":false},"excerpt":{"rendered":"

You may already use screen for multiplexing a terminal. This is especially useful when you want to start long running processes on a server and do not want to loose the connection because of a ssh connection timeout, firewall settings or other reasons. 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This is especially useful when you want to start long running processes on a server and do not want to loose the connection because of a ssh connection timeout, firewall settings or other reasons. 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He has more than 15 years of experience in management, engineering and optimization of databases and infrastructures, especially on Oracle and PostgreSQL. Since the beginning of his career, he has specialized in Oracle Technologies and is Oracle Certified Professional 12c and Oracle Certified Expert RAC\/GridInfra. Over time, Daniel has become increasingly interested in open source technologies, becoming \u201cTechnology Leader Open Infrastructure\u201d and PostgreSQL expert. \u00a0Based on community or EnterpriseDB tools, he develops and installs complex high available solutions with PostgreSQL. He is also a certified PostgreSQL Plus 9.0 Professional and a Postgres Advanced Server 9.4 Professional. He is a regular speaker at PostgreSQL conferences in Switzerland and Europe. Today Daniel is also supporting our customers on AWS services such as AWS RDS, database migrations into the cloud, EC2 and automated infrastructure management with AWS SSM (System Manager). He is a certified AWS Solutions Architect Professional. Prior to dbi services, Daniel was Management System Engineer at LC SYSTEMS-Engineering AG in Basel. Before that, he worked as Oracle Developper &\u00a0Project Manager at Delta Energy Solutions AG in Basel (today Powel AG). Daniel holds a diploma in Business Informatics (DHBW, Germany). 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