190 lines
4.5 KiB
Markdown
190 lines
4.5 KiB
Markdown
---
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created: 2024-01-29T05:19:01.392Z
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type: topic
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updated: 2024-12-05T14:57:36.000Z
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---
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# Ubuntu
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- [Barcode Host](../.kanbn/archive/barcode-host.md)
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```bash
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uname -a
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hostnamectl
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lsb_release -a
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cat /etc/issue
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cat /etc/os-release
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```
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```bash
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sudo -l
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timedatectl set-timezone America/Phoenix
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find / -name "secrets.json" 2>/dev/null
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ls -1 | wc -l
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cp -R -u -p /source /destination
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```
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```bash
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cd /home
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# directory percent tree
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ncdu
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ncdu --sort=name-desc
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```
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```bash
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adduser syncthing
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```
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```bash
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# Free space
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df -h --total
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vgdisplay
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lvdisplay
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lsblk
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apt install smartmontools
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smartctl -i /dev/sda
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```
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```bash
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# mount
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mount /dev/sda4 /mnt
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umount /dev/sda4
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# mount -o remount,uid=1000,gid=1000,rw /dev/sda4
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# mount -t ntfs -o nls=utf8,umask=0222 /dev/sda4 /mnt
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# mount -t ntfs -o ro /dev/sda4 /mnt
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# mkdir /home/mike/1-Images-A
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# mount --bind /mnt/1-Images-A /home/mike/1-Images-A
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# mount -o remount,rw /home/mike/1-Images-A
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# umount /home/mike/1-Images-A
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# rm -R /home/mike/1-Images-A
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mkfs -t ext4 /dev/sda4
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mount /dev/sda4 /mnt
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blkid
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```
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```conf
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/dev/sda4: UUID="27753635-40b1-4f21-8f6c-28b1c1997cfb" BLOCK_SIZE="4096" TYPE="ext4" PARTLABEL="Basic data partition" PARTUUID="b920a38c-4682-4c16-9abd-a385fd57b29d"
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```
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```bash
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# https://askubuntu.com/questions/45607/how-to-mount-partition-permanently
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nano /etc/fstab
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```
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```conf
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/dev/disk/by-uuid/27753635-40b1-4f21-8f6c-28b1c1997cfb /mnt ext4 defaults 0 2
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```
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```bash
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fdisk -l
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lvdisplay
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lvm lvextend -l +100%FREE /dev/ubuntu-vg/ubuntu-lv
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esize2fs -p /dev/mapper/ubuntu--vg-ubuntu--lv
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```
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```bash
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apt-get install lshw
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lshw -class disk -class storage
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lshw -html > /var/www/html/my-specs.html
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nano /var/www/html/my-specs.html
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apt-get install smartmontools
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smartctl -i /dev/sda
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apt-get install hdparm
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hdparm -I /dev/sda
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```
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```bash
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# https://stackoverflow.com/questions/338037/how-to-check-permissions-of-a-specific-directory
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ls -la
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namei -l
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getfacl
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stat -c "%n %a"
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```
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```bash
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# https://www.cyberciti.biz/faq/how-to-use-sed-to-find-and-replace-text-in-files-in-linux-unix-shell/
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sed -i 's/net8.0/net6.0/g' Shared/OI.Metrology.Shared.csproj
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```
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```bash
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# all users
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compgen -u
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# all groups
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compgen -g
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usermod -a -G docker mike
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groups list mike
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```
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```bash
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# https://stackoverflow.com/questions/49249375/how-to-disable-cloud-init-networking
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/etc/cloud/cloud.cfg.d/99-disable-network-config.cfg
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```
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```yaml
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network: {config: disabled}
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```
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```bash
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# https://intercom.help/privatevpn/en/articles/6440374-how-to-disable-ipv6-on-ubuntu-and-fedora-linux
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nano /etc/sysctl.conf
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```
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```conf
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net.ipv6.conf.all.disable_ipv6 = 1
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net.ipv6.conf.default.disable_ipv6 = 1
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net.ipv6.conf.lo.disable_ipv6 = 1
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```
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```bash
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sysctl -p
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cat /proc/sys/net/ipv6/conf/all/disable_ipv6
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```
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```bash
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# https://www.omgubuntu.co.uk/2021/07/enable-minimize-click-ubuntu-dock
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gsettings set org.gnome.shell.extensions.dash-to-dock click-action 'minimize'
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```
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```bash
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# View package virtual IP per Peter Kim
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mviewcl
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```
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```bash
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apt list --installed
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lsof -i -P -n | grep LISTEN
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lsblk -I 8 -o NAME,SIZE,TYPE,FSUSED,FSUSE%
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lsblk -b -o NAME,SIZE,TYPE,VENDOR,MODEL,SERIAL
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(echo >/dev/tcp/localhost/22) &>/dev/null && echo "Open 22" || echo "Close 22"
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```
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## Find symbolic links
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- [how-to-list-all-symbolic-links-in-a-directory](https://askubuntu.com/questions/522051/how-to-list-all-symbolic-links-in-a-directory)
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```bash Wed Jul 31 2024 11:19:12 GMT-0700 (Mountain Standard Time)
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find . -type l -ls
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find . -type f -maxdepth 1 | wc -l
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```
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## Save and Restore Permissions
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- [is-it-possible-to-create-a-script-to-save-and-restore-permissions](https://stackoverflow.com/questions/3450250/is-it-possible-to-create-a-script-to-save-and-restore-permissions)
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```bash Wed Jul 31 2024 13:25:41 GMT-0700 (Mountain Standard Time)
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getfacl -R yourDirectory > permissions.acl
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setfacl --restore=permissions.acl
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tree -ap>tree.txt
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```
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## NVMe Slot Gen
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- [how-to-determine-from-command-line-if-nvme-slot-is-gen-3-or-gen-](https://askubuntu.com/questions/1428578/how-to-determine-from-command-line-if-nvme-slot-is-gen-3-or-gen-4#:~:text=Here%20we%20can%20see%20the,generation%20of%20the%20PCIe%20itself.&text=Here%20we%20can%20see%20the%20slot%20supports%20up%20to%2016,s%20thence%20it%20is%20Gen4)
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```bash 1731286496058 = 638668832960580000 = Sun Nov 10 2024 17:54:55 GMT-0700 (Mountain Standard Time)
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lspci | grep -i nvme
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# 02:00.0 Non-Volatile memory controller: Sandisk Corp WD Black SN770 / PC SN740 256GB / PC SN560 (DRAM-less) NVMe SSD (rev 01)
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lspci -vv -s 02:00.0 | grep -w LnkCap
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# LnkCap: Port #0, Speed 16GT/s, Width x4, ASPM L1, Exit Latency L1 <8us
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```
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