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Ubuntu Unleashed 2014 Edition: Covering 13.10 and 14.04,Ninth Edition by Paul Hudson, Andrew Hudson, Matthew Helmke

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Essential Commands in /bin and /sbin

The /bin directory contains essential commands used by the system for running and booting the system. In general, only the root operator uses the commands in the /sbin directory. The software in both locations is essential to the system; they make the system what it is, and if they are changed or removed, it could cause instability or a complete system failure. Often, the commands in these two directories are statically linked, which means that the commands do not depend on software libraries residing under the /lib or /usr/lib directories. Nearly all the other applications on your system are dynamically linked, meaning that they require the use of external software libraries (also known as shared libraries) ...

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