bash - Cannot redirect the ouput of hwclock -r command -



bash - Cannot redirect the ouput of hwclock -r command -

i implementing shell script , want analyse output shown hwclock -r (--show) command displays rtc time , date.

to tried things like: hwclock -r | grep -v "grep" | grep "error" > /dev/null see if error happened while reading rtc registers.

the problem output , forwarded console. tried forwards output file analyse content , tried utilize tee -a command direct output both console , file, no success.

is there solution or explanation happening hwclock -r command.

in advance give thanks you.

i solved forwarding error messages file create analysis.

hwclock -r 2> file.txt; grep -v "grep" | grep "error" > /dev/null job.

you omitted file.txt in first grep.

if want check "error", not old bash do, in shorter way:

hwclock -r |& grep error >/dev/null

bash shell hwclock

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