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* shell: Add a ping command.Chris Johns2014-09-161-0/+116
The ping code is taken from a recent FreeBSD release. Some options have been tested, other not tested or do not work. This could be due to the age of our TCP/IP stack. This version of ping will not work if more than 64 file descriptors are open at once because the select FD size is 64 as set in newlib.