shell script to monitor cpu and memory usage in linux

Ctrl + C does not exit the above command, not sure why trap exit is not working as it does with ps.My only problems with this is that top is not as nice for interactive usage: How to suppress the general information for top command.how to remove the headers from top: no one has a better solution so we just tail it:.Tasks: 1 total, 1 running, 0 sleeping, 0 stopped, 0 zombie While true do top -b n1 -d '$' -n1 -p '$pid' | tail -1 printf '$i ' i=$(($i + 1)) doneĪs mentioned e.g. We could therefore use top -n1 instead of ps if we wanted that: toppp() (

That thread as well as: How can I determine the current CPU utilization from the shell? suggest that the Linux kernel does not store any more intermediate usage statistics, so the only way to do that would be to poll and calculate for the previous period, which is what top does. over the last N seconds), but rather the average over the processes' entire lifetime as mentioned at: ps memory measures should be fine however. Note that the CPU usage given by ps above is not 'instantaneous' (i.e. This can be useful to help correlate at which point memory usage bursts with stdout. myprog: don't hide program stdout/stderr. If your program finishes, the loop stops and we exit topp.Īlternatively, if you git Ctrl + C, the program also stops due to the trap: How do I kill background processes / jobs when my shell script exits? Where vsz is the total memory usage in KiB, e.g. This form is useful if you want to benchmark an executable easily: topp() (

Shell script to monitor cpu and memory usage in linux