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Editorial Team
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Asked: 2026-06-08T02:01:29+00:00

I’m new to bash and want to improve. I need to learn reading specific

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I’m new to bash and want to improve. I need to learn reading specific text from a file or from output of a command.For example I want to sum of the total ethernet interrupt numbers of each core of the computer from /proc/interrupts file.The content of the file is:

CPU0       CPU1       CPU2       CPU3
0:        142          0          0          0   IO-APIC-edge      timer
1:          1          0          1          0   IO-APIC-edge      i8042
4:        694         18        635         19   IO-APIC-edge      serial
7:          0          0          0          0   IO-APIC-edge      parport0
9:          0          0          0          0   IO-APIC-fasteoi   acpi
12:          1          1          0          2   IO-APIC-edge      i8042
14:          0          0          0          0   IO-APIC-edge      ide0
19:          0          0          0          0   IO-APIC-fasteoi   uhci_hcd:usb3
23:          0          0          0          0   IO-APIC-fasteoi   ehci_hcd:usb1,  uhci_hcd:usb2
46:     347470     119806     340499     108227   PCI-MSI-edge      ahci
47:      33568      45958      46028      49191   PCI-MSI-edge      eth0-rx-0
48:          0          0          0          0   PCI-MSI-edge      eth0-tx-0
49:          1          0          1          0   PCI-MSI-edge      eth0
50:      28217      42237      65203      39086   PCI-MSI-edge      eth1-rx-0
51:          0          0          0          0   PCI-MSI-edge      eth1-tx-0
52:          0          1          0          1   PCI-MSI-edge      eth1
59:     114991     338765      77952     134850   PCI-MSI-edge      eth4-rx-0
60:     429029     315813     710091      26714   PCI-MSI-edge      eth4-tx-0
61:          5          2          1          5   PCI-MSI-edge      eth4
62:    1647083     208840    1164288     933967   PCI-MSI-edge      eth5-rx-0
63:     673787    1542662     195326    1329903   PCI-MSI-edge      eth5-tx-0
64:          5          6          7          4   PCI-MSI-edge      eth5

I need to read all of the numbers of interrupts with “eth” keyword and then find the sum of them for each CPU core(whateve the CPU core name is). For example for CPU0:33568+0+1+28217…
What is suitable for this? Must I use awk or sed for regex and how?

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1 Answer

  1. Editorial Team

    You could use awk for this, there is no need for grep or any other tool since awk can do the search itself.

    UPDATE:

    Based on the possibility of varying number of CPU columns (see first comment below), this will work:

    NR==1 {
  core_count = NF
  print "core count: ", core_count
  next
}
/eth/ {
  for (i = 2; i <= 2+core_count; i++)
    totals[i-2] += $i
}

END {
  print "Totals"
  for (i = 0; i < core_count; i++)
    printf("CPU%d: %d\n", i, totals[i])
}

    gives output:

    core count:  4
Totals
CPU0:  2926686
CPU1:  2494284
CPU2:  2258897
CPU3:  2513721

    Notes:

    If the first line only contains CPU headers, then using NF as shown at the start of the script will work. If other data might be present then core_count = gsub(/CPU/, "CPU") could be used. Also, this script depends on consecutive CPU columns.

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