Unix command line conventions over time

Posted on 2022-06-07 [Tuesday] by Jay Jay

This didn’t tell me anything I didn’t know, but I was pleased to read it: Unix command line conventions over time.

On the other end of the spectrum: UX patterns for CLI tools.

Monitoring CPU clock speed

Posted on 2022-05-16 [Monday] by Jay Jay

$ watch 'grep MHz /proc/cpuinfo | awk "{ print \$4 }" | sort -n'

Linux system specs

Posted on 2022-05-16 [Monday] by Jay Jay

If you want to get a simple report on your linux system’s specifications, try these:

$ neofetch
$ inxi
$ hwinfo –short

Distributed Systems Shibboleths

Posted on 2022-05-02 [Monday] by Jay Jay

This via r/programming today: Distributed Systems Shibboleths.

Replace a faulty disk on a Mirrored or RAIDZ virtual device

Posted on 2022-04-12 [Tuesday] by Jay Jay

I have a degraded ZFS array due to too many write errors on one of my disks. When my replacement disk arrives I will follow these instructions to resolve the issue: Replace a faulty disk on a Mirrored or RAIDZ virtual device.

ZFS verification process

Posted on 2022-04-10 [Sunday] by Jay Jay

The ZFS verification process is called a ‘scrub’ and it is done periodically (usually every few weeks). To report on the status of a scrub in progress use the `zfs scrub` command.

File types In Linux

Posted on 2022-03-29 [Tuesday] by Jay Jay

Today I found myself referring to: File types In Linux/Unix explained in detail. Basically:

Regular file (-)
Directory file (d)
Block file (b)
Character device file (c)
Named pipe file or just a pipe file (p)
Symbolic link file (l)
Socket file (s)

Also apparently there is a thing called a Door File on Solaris, but, alas, we’re not caring about that.

Ethernet on ‘trick’

Posted on 2022-03-28 [Monday] by Jay Jay

Note to self: I’ve disabled my second NIC enp7s0 for now, I can enable it when its cable arrives.

-------------------
Mon Mar 28 16:34:31 [bash:5.0.17 jobs:0 error:0 time:1505]
root@trick:/home/jj5
# cat /etc/netplan/00-installer-config.yaml
# This is the network config written by 'subiquity'
network:
  ethernets:
    enp10s0:
      addresses:
      - 10.3.2.5/16
      gateway4: 10.3.1.1
      nameservers:
        addresses:
        - 10.1.1.113
        search: []
    #enp7s0:
    #  addresses:
    #  - 10.1.2.5/16
    #  nameservers:
    #    addresses: []
    #    search: []
  version: 2

-------------------

blockdev –getsize64 /dev/sda

Posted on 2022-03-26 [Saturday] by Jay Jay

Today I learned you can get the size of a block device with e.g.: sudo blockdev --getsize64 /dev/sda

John's blog

Talking about technology (mostly)

Category Archives: Sys Admin