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Dealing with CISCO IOS, sometimes we need to know for how long our device is "UP" since last "restart".

Unlike CISCO NX-OS 4.0 + which has dedicated command "show system uptime"  CISCO IOS doesn't. 

Instead we can extract the up-time value data using "show version" and looking inside the whole content will discover the up-time counter included.

Quicker way is to get the specific information instead, is to browse the whole content using "show version | i uptime"