I want to change the priority of a process using top command

  • perhaps you meant htop? top and htop are two different tools and htop can indeed change priorities – AnonymousLurker Nov 28 '18 at 4:50

Once given top command, press r. Give PID value of the process you want to change the process value. Give renice value (from -20 to +19)

Nice value of -20 means highest priority value and +19 means lowest priority value. 0 is by default value.

Don't confuse renice value (-20 to +19) with process value (0 to 39)

relation between nice value and priority is :

PR = NI + 20
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In addition to erTugRul’s answer, the renice command exists for this exact function.

renice -5 -p 1234
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