[thecompilr]

You can either use lscpu, which is less accurate, or the best way is to check:

cat /sys/devices/system/cpu/cpu0/cpufreq/cpuinfo_cur_freq

where instead of cpu0 you can write any core number, and it will give you the current frequency of that core in KHz.

[pkaye]

I'll try that out. Thanks.

[lathiat]

Note that with pstate /proc/cpuinfo is not reflective (not suggested here but, in the past, the MHz used to change to reflect the scaling speed). You could also look at 'powertop'