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edit approved Dec 5, 2017 at 18:24

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This solution uses awkawk to parse the output of tail and call a command with system()system() if the event is detected.

Also, you might want to avoid parsing the output of lsls and using globbing instead.

for log_file in /var/log/myApp-*.log; do 
    tail -F $log_file | awk '{l=gensub(/.+\"level\": ([0-9]+).+/,"\\1","g",$0); if(l>50 && l!= $0){system("echo command")}}' &
done

This solution uses awk to parse the output of tail and call a command with system() if the event is detected.

Also, you might want to avoid parsing the output of ls and using globbing instead.

for log_file in /var/log/myApp-*.log; do 
    tail -F $log_file | awk '{l=gensub(/.+\"level\": ([0-9]+).+/,"\\1","g",$0); if(l>50 && l!= $0){system("echo command")}}' &
done

This solution uses awk to parse the output of tail and call a command with system() if the event is detected.

Also, you might want to avoid parsing the output of ls and using globbing instead.

for log_file in /var/log/myApp-*.log; do 
    tail -F $log_file | awk '{l=gensub(/.+\"level\": ([0-9]+).+/,"\\1","g",$0); if(l>50 && l!= $0){system("echo command")}}' &
done

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answered Dec 5, 2017 at 17:54

Tom

This solution uses awk to parse the output of tail and call a command with system() if the event is detected.

Also, you might want to avoid parsing the output of ls and using globbing instead.

for log_file in /var/log/myApp-*.log; do 
    tail -F $log_file | awk '{l=gensub(/.+\"level\": ([0-9]+).+/,"\\1","g",$0); if(l>50 && l!= $0){system("echo command")}}' &
done