Утилита awk

15

Использование переменных в программах awk:

$ ps aux |head -n 5

USER PID %CPU %MEM VSZ RSS TTY STAT START TIME COMMAND

root 1 0.0 1.0 86996 11400 ? Ss Mar10 0:55 /lib/..

message+ 60 0.0 0.3 8076 3992 ? Ss Mar10 0:19 /bin/..

root 62 0.0 0.6 13720 7012 ? Ss Mar10 0:09 /lib/..

root 77 0.0 0.2 3236 2196 ? Ss Mar10 0:02 /usr/..

$ ps aux | awk '/^[^U]/ {n++;CPU=CPU+$3; MEM=MEM+$4;}

> END{print "CPU: ",CPU,"%; MEM=",MEM,"%"}'

CPU: 0 %; MEM= 14.8 %

$ ps aux | awk 'BEGIN{N=0; CPU=100.0; MEM=100.0;}

> /^[^U]/ {N++;CPU-=$3; MEM-=$4;}

> END{print "Proc:",N,"; free CPU: ",CPU"%; free MEM:",MEM"%"}'

Proc: 20 ; free CPU: 100%; free MEM: 85.1%