Ubuntu CLI Quick Reference

Configuration

Produce web page of hardware data:

• # lshw  -html  >hardware.html

Sensors

Temperature:

• $ sensors
• iwlwifi-virtual-0
• Adapter: Virtual device
• temp1: N/A
•  
• coretemp-isa-0000
• Adapter: ISA adapter
• Package id 0: +46.0°C (high = +100.0°C, crit = +100.0°C)
• Core 0: +46.0°C (high = +100.0°C, crit = +100.0°C)
• Core 1: +45.0°C (high = +100.0°C, crit = +100.0°C)
•  
• pch_skylake-virtual-0
• Adapter: Virtual device
• temp1: +47.5°C

CPU & I/O

Statistics for devices and partitions:

• $ iostat  |  grep  -v  "loop"
• Linux 4.15.0-42-generic (ray-desktop) 2018-12-09 _x86_64_ (4 CPU)
•  
• avg-cpu: %user %nice %system %iowait %steal %idle
• 3.54 0.01 0.90 0.18 0.00 95.36
•  
• Device tps kB_read/s kB_wrtn/s kB_read kB_wrtn
• sda 5.73 20.54 211.40 1919230 19752713
• sdb 0.04 0.21 0.47 19965 43800

Events

Test input events and devices:

• # evtest
• No device specified, trying to scan all of /dev/input/event*
• Available devices:
• /dev/input/event0: Sleep Button
• /dev/input/event1: Power Button
• /dev/input/event2: Power Button
• /dev/input/event3: Video Bus
• /dev/input/event4: Microsoft Microsoft 3-Button Mouse with IntelliEye(TM)
• /dev/input/event5: Das Keyboard
• /dev/input/event6: Das Keyboard
• /dev/input/event7: Dell Dell AC511 USB SoundBar
• ...
• Select the device event number [0-14]: 8
• Input driver version is 1.0.1
• Input device ID: bus 0x19 vendor 0x1283 product 0x0 version 0x0
• Input device name: "ITE8708 CIR transceiver"
• Supported events:
• Event type 0 (EV_SYN)
• Event type 1 (EV_KEY)
• ...
• Properties:
• Testing ... (interrupt to exit)

Errors

Summary or details of errors:

• # ras-mc-ctl  --summary
• # ras-mc-ctl  --errors

Battery

Battery status:

• $ upower  --dump

Remote Filesystems

Show filesystems exported by other hosts:

Warning: process can hang.

• $ showmount  --exports  hostname

SMART

Examine SMART filesystems:

• $ smartctl  --scan
• /dev/nvme0 -d nvme # /dev/nvme0, NVMe device
• # smartctl  --all  /dev/nvme0
• Model Number: WDS100T3X0C-00SJG0
• Serial Number: 203796801402
• Firmware Version: 111110WD
• …

Busy

Show processes busying mountpoint:

• $ fuser  -c  /media/ray/xxx

Versions

Linux Standard Base release:

• $ lsb_release  -a
• No LSB modules are available.
• Distributor ID: Ubuntu
• Description: Ubuntu 20.04.1 LTS
• Release: 20.04
• Codename: focal

Analysis

Initialization times:

• $ systemd-analyze  blame

Logs

Display systemd journal:

• $ journalctl  -b  -p  err

Jpeg

Display jpeg metadata:

• $ exiftags  *.jpeg

Display or change jpeg timestamps:

• $ exiftime  -f  -ta  -v+26d  -w  *.jpeg

MP3

Display mp3 metadata:

• $ mp3info  file.mp3

Display or edit mp3 metadata:

• $ easytag  &

Conversion

Convert files:

• $ convert  -resize 50%  input.png  output.jpeg
• $ convert  -define jpeg:extent=9mb  input.png  output.jpeg

Text to audio

Pronounce text in file through speaker:

• $ festival  --tts  file

Recording

Record from microphone:

• $ arecord  --channels=2  output.wav

XTerm

Display xterm settings:

• $ appres  XTerm
• *vtMenu*visualbell*Label: Enable Visual Bell
• *vtMenu*appcursor*Label: Enable Application Cursor Keys
• *vtMenu*clearsavedlines*Label: Reset and Clear Saved Lines
• …

Fetch

Detect unread mail:

• $ openssl  s_client  -connect  mailservices.uwaterloo.ca:993
• 1 login rbutterw <password>
• 2 select inbox
• 3 search unseen
• * SEARCH 11 13 14 16
• 3 OK Completed (4 msgs in 0.000 secs)
• 4 logout