run command with sudo with piping.

You can invoke a new shell as root:

sudo sh -c 'echo clock_hctosys=\"YES\" >> /etc/conf.d/hwclock'

You could also just elevate a process to write to the file:

sudo tee -a /etc/conf.d/hwclock > /dev/null << EOF
clock_hctosys="YES"
EOF

https://unix.stackexchange.com/questions/106663/how-to-run-a-command-that-involves-redirecting-or-piping-with-sudo


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