Various tips

SSH

env TERM="xterm-256color" ssh -o "UserKnownHostsFile=/dev/null" -o "StrictHostKeyChecking=no" [email protected] -p 2222

Vim

How to convert the ^M linebreak to 'normal' linebreak in vim

:set fileformat=unix

Man

  1. User-level commands and applications

  2. System calls and kernel error codes

  3. Library calls

  4. Device drivers and network protocols

  5. Standard file formats

  6. Games and demonstrations

  7. Miscellaneous files and documents

  8. System administration commands

  9. Obscure kernel specs and interfaces

man sync gets you the man page for the sync command, and man 2 sync gets you the man page for the sync system call.

man -k keyword or apropos keyword prints a list of man pages that have keyword in their one-line synopses.

Bash

use <Alt-[0-9]> <Alt-.> to repeat the nth arg (0 is command) <Alt-.> again to repeat the nth arg

With bash, use -x to echo commands before they are executed and -n to check commands for syntax without executing them.

To redirect both STDOUT and STDERR to the same place, use the >& symbol. To redirect STDERR only, use 2>.

convert binary to int 

echo "$((2#00011000))"

Printing

The lpr command transmits copies of the files to the CUPS server Most changes require jobs to be identified by their job number, which you can get from lpq. For example, to remove a print job, just run lprm jobid. lpstat -t summarizes the print server’s overall status. telling CUPS to use a particular default for your account lpoptions -dprinter_name

Network

nmcli dev wifi connect SSID password PASSWORD

Prioritize a connection among multiple ones

sudo ifmetric enp0s20f0u2 50

Bluetooth

Connect to a Bluetooth device from command line in Ubuntu Linux

hcitool scan  # to get the MAC address of your device
bluetoothctl
agent on
scan on  # wait for your device's address to show up here
scan off
trust MAC_ADDRESS
pair MAC_ADDRRESS
connect MAC_ADDRESS

Brightness

echo 500 | sudo tee /sys/class/backlight/intel_backlight/brightness

Docker

Run git in docker

docker run -ti --rm -v $HOME/.ssh:/root/.ssh:ro \
    -v $(pwd):/repository \
    -w /repository \
    -v /etc/passwd:/etc/passwd:ro \
    -v /etc/group:/etc/group:ro \
    --user $(id -u):$(id -g) \
    -e GIT_SSH_COMMAND="ssh -o UserKnownHostsFile=/dev/null -o StrictHostKeyChecking=no" \
    --entrypoint "" alpine/git /bin/sh
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