scripts

Just a collection of various scripts.

Random snippets I looked up sometime and will probably need again

firewalld

List zones / manage interfaces

List active zones: firewall-cmd --get-active-zones
Remove an interface from a zone: firewall-cmd --zone=zone-name --remove-interface=dev-name
Add an interface to a zone: firewall-cmd --zone=zone-name --add-interface=dev-name
If the interface is controlled by NetworkManager, use nm-connection-editor to set the zone permanently.

Enable and disable ports

List open services/ports/others: firewall-cmd --list-all
Allow a port in a zone: firewall-cmd --zone=zone-name --add-port=port-number/port-type
Removing a port is done analogously with --remove-port.

Making changes permanent

By default, the above changes are temporarily.
To make changes permanent, run firewall-cmd --runtime-to-permanent

Spawn a simple webserver to share files

python3 -m http.server 8080

ssh

jumps

Dynamic jump: ssh -J user1@host1:port1 user2@host2:port2
Over multiple machines: ssh -J user1@host1:port1,user2@host2:port2 user3@host3
Use the ProxyJump directive in ~/.ssh/config to specify a jump host for a machine that is not directly reachable.

git

Removing an entire commit

git rebase -p --onto SHA^ SHA

Handle encrypted files

git config diff.gpg.textconv "gpg2 --decrypt -q"
echo "*.gpg filter=gpg diff=gpg" >> .gitattributes
echo "*.asc filter=gpg diff=gpg" >> .gitattributes

vim

Copy full path of current file to paste buffer

:let @" = expand("%:p")

Scroll in vims terminal window

Enter normal mode in the terminal window: Ctrl-w N
Now use usual vim commands for moving around, coying, pasting.
Exit normal mode as usual with 'i' or 'a'

tmux

Send command to all panes in current window

• Ctrl-b :setw synchronize-panes
• Run commands ...
• Ctrl-b :setw synchronize-panes

mutt

Send calendar invitation that is recognized by thunderbird or outlook

• Copy ics content into mail body
• Before sending, use ctrl+t to change content-type to text/calendar and add method=REQUEST

Handle html-only mails

In mailcap file (see muttrc: set mailcap_path = /path/to/mailcap):

text/html; w3m -I %{charset} -T text/html; copiousoutput;

In muttrc or on demand:

auto_view text/html

If you put in in muttrc, also add

alternative_order text/plain text/enriched text/html

udev

Disable internal webcam

Easy, thanks to Rob Hoelz! See his blog post for details on this: https://hoelz.ro/blog/using-udev-to-disable-my-infrared-camera-on-linux.

Add /etc/udev/rules.d/99-disable-internal-webcam.rules with content:

ACTION!="add|change", GOTO="camera_end"
ATTRS{idVendor}=="xxxx",ATTRS{idProduct}=="yyyy",ATTR{bConfigurationValue}="0"
LABEL="camera_end"

Gnome shell

Restart an unresponsive and broken gnome-shell session:

killall -HUP gnome-shell

According to stackoverflow,

busctl --user call org.gnome.Shell /org/gnome/Shell org.gnome.Shell Eval s 'Meta.restart("Restarting…")'

should be equivalent to Alt+F2 restart, but did not help in my case and just timeouted.

dpkg

Installation/removal scripts (e.g., preinst, postrm, ...) failed

When dpkg handles a package, the scripts are temporarily stored in e.g., /var/lib/dpkg/info/mypkg.postrm. As a quick workaround, you can inspect them, change them, or simply remove them before re-executing the action.