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Show elapsed (round-trip) time of packets.
$fping -e www.gnu.org www.gnu.org is alive (301 ms) $fping -e www.gnu.org www.gnu.org is alive (302 ms) $fping -e www.rajagiritech.edu.in www.rajagiritech.edu.in is alive (62.2 ms) $fping www.gnu.org www.gnu.org is alive $ping www.gnu.org PING wildebeest.gnu.org (208.118.235.148) 56(84) bytes of data. 64 bytes from wildebeest.gnu.org (208.118.235.148): icmp_seq=1 ttl=49 time=302 ms 64 bytes from wildebeest.gnu.org (208.118.235.148): icmp_seq=2 ttl=49 time=301 […]
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Extracting the second word from a string variable
https://unix.stackexchange.com/questions/174037/extracting-the-second-word-from-a-string-variable
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perf: Linux profiling with performance counters
https://perf.wiki.kernel.org/index.php/Tutorial#Attaching_to_a_running_process
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A bit field is a data structure used in computer programming
https://en.wikipedia.org/wiki/Bit_field