Listing 1: The load Script

1: #
2: # load: Display system load, with suggestions as to how appropriate a
3: #       time it is to run a CPU-intensive process.
4: #
5:
6: echo
7: echo "     SYSTEM LOAD ANALYSIS"
8: echo
9:
10: uptime | awk '{
11:     val = $(NF - 2)
12:
13:     if (substr(val, length(val), length(val)) == ",")
14:         val = substr(val, 1, length(val)-1)
15:
16:     printf "The current system load is %s\n\n", val
17:
18:     if (val < 1) {
19:         print "This is a very light system load."
20:         print "It is a good time to run a report."
21:     }
22:     else if (val < 1.5) {
23:         print "This is a relatively light system load. It is OK to run"
24:         print "a report now."
25:     } else if (val < 2) {
26:         print "This is a moderate system load. Long reports will slow"
27:         print "the system down a bit, but go ahead if you must."
28:         print "Better yet, for low-priority reports, wait until the"
29:         print "system load drops below 1.00."
30:     } else if (val < 3) {
31:         print "This is a medium-to-heavy load. Please do not run long reports"
32:         print "unless you really have to. They WILL slow the system down somewhat."
33:     } else if (val < 4) {
34:         print "This is a heavy load. Please do not run reports unless they are"
35:         print "very urgent."
36:     } else if (val < 5) {
37:         print "This is an EXTREMELY HEAVY system load. Please defer running any"
38:         print "reports at least until the load drops down under 3.00,"
39:         print "preferably under 2.00. Thank you."
40:     }
41:     else if (val < 7) {
42:         print "At this rate, the CPU may soon have a meltdown..."
43:         print "Please, PLEASE do NOT run any reports until the load"
44:         print "settles down below 3.00 !! THANK YOU!"
45:     }
46:     else {
47:         print "This is a ridiculously heavy load; there may be"
48:         print "something wrong with the system. Please contact a Tech"
49:         print "person immediately, and, of course, do not run any reports."
50:     }
51: }'