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I am a beginner at scripting but I’m trying to make a shell script called monitornsusystem.sh that will append system related information to the file: systemstatus.log. This system information I need to append is: current date and time, CPU utilization as a percentage and system memory in use as a percentage. I can get all the right information from individual commands but when I put them together in a script, it’s not working the way I planned.

#!/bin/bash
sysstat=echo “date +'%d/%m/%Y %H:%M:%S' | echo $[100-$(vmstat 1 2|tail -1|awk '{print $15}’)]% | free | grep Mem | awk '{print $3/$2 * 100.0}’” >> systemstatus.log
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    In what way is it not 'working as planned'? I see a couple of potential issues with the command you posted, but it would be useful to know specifics. – bertieb Feb 25 '17 at 13:03
  • Those characters look a bit like double-quotes ", but they are different. That really won't help. – Toby Speight Mar 1 '17 at 16:14
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Without more details I just can figure out that your desired command and output could be:

echo -n $(date +'%d/%m/%Y %H:%M:%S')" " && echo -n $(vmstat 1 2 | tail -1 | awk '{print $15}')" " && echo $(free | grep Mem | awk '{print $3/$2 * 100.0}')

Which would provide:

27/02/2017 12:40:47 99 78.2968

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