Tutorials BASH Shell Troubleshooting Nginx Networking MySQL Google Cloud Platform Amazon Cloud Computing Rackspace Cloud Computing Linux CentOS Debian / Ubuntu Ubuntu Linux Suse RedHat and Friends Slackware Linux UNIX AIX Mac OS X FreeBSD FreeBSD Jails (VPS) Openbsd Solaris See all tutorial topics Blog About Contact us Forum Linux Scripting Guide RSS/FEED Linux FAQ / Howtos by nixCraft on January 13, 2008 · 19 comments · LAST UPDATED February 24, 2014 in BASH Shell , Linux , UNIX I 've a small shell script and I would like to convert all incoming user input to lowercase using a shell script. How do I convert uppercase words or strings to a lowercase or vise versa on Unix-like / Linux bash shell? Use the tr command to convert all incoming text / words / variable data from upper to lower case or vise versa (translate all uppercase characters to lowercase). Bash version 4.x+ user Tutor...