byobu

Byobu with tmux back end To start a new Byobu session with a specified name:

byobu new -s <session-name>

To change the name of a pre-existing session:

byobu rename -t <session-name> <new-session-name>

bash cheat sheet

One of the most popular shells, bash - Bourne Again SHell, uses GNU’s Readline library for reading the command line. Both emacs and vi editing modes are available.

For the default, emacs, editing mode in bash (also available in most text input places, eg. : location bar in the browser, text field in the webpage):

Moving

Ctrl + A: move to the beginning of the line
Ctrl + E: move to the end of the line
Alt + B: move back one word
Alt + F: move forward one word
Ctrl+ XX: toggle between first and current position

Delete/Cut/Paste

Ctrl + U: delete to the beginning of the line
Ctrl + K: delete to the end of the line
Ctrl + W: delete the last word
Ctrl + Y: paste the last deleted command

Util

Ctrl + _: undo
Ctrl + C: cancel the current command/line
Ctrl + L: clear the terminal
Ctrl + N: Next command from the History
Ctrl + P: previous command from the History

Ctrl + R: search command in history - type the search term
Ctrl + J: end the search at current history entry
Ctrl + G: cancel the search and restore original line

http://www.catonmat.net/blog/bash-emacs-editing-mode-cheat-sheet/

linux command cheat sheet

curl

post json using curl

curl -H "token: YOUR_TOKEN" \
-H "Content-Type: application/json" \
--request POST --data '{"top_count": 5, "days": 7}' \
"http://YOUR_IP/detect/v1/top_pkg/"

pbcopy/pbpaste: copy/paste lines

Use “pbcopy” to copy content of file to your clipboard. For example:

$ pbcopy < file.txt

cat file.txt | pbcopy

iptables

add to top:
sudo iptables -I INPUT 1 -i lo -j ACCEPT
allow a port:
sudo iptables -A INPUT -p tcp --dport 8880 -j ACCEPT

add group

sudo groupadd docker

add user to group

sudo usermod -aG docker $USER

create symlink

ln -s /path/to/file /path/to/symlinksudo
ln -s /usr/local/mysql/bin/mysql /usr/local/bin/mysql

delete first 3 lines from file

sed -i ‘1,3d’ file.txt

Could not open a connection to your authentication agent

eval ssh-agent -s

ssh remote port forwarding

ssh -nNT -L 9000:ifconfig.me:80 mords

ubuntu set default editor

sudo update-alternatives --config editor

find and delete files

find . -name "*.pyc" -delete

add BOM to UTF-8 files

many programs will have trouble reading UTF-8 text files if they don’t have a BOM.

printf '\xEF\xBB\xBF' | cat - source.txt > source-with-bom.txt

The cat - bit says to concatenate to the front of source.txt what’s being piped in from the print command.

Enable or Disable Service

CentOS 7 or Ubuntu 16.06

systemd is a system and service manager for Linux operating systems. It is now used by default in most Linux distributions and is fully supported in Ubuntu-15.04 and later releases. It goes with systemctl command line tool, that among the other things, can enable and disable services at boot time.

Check if service is enabled or disabled on startup:

sudo systemctl is-enabled SERVICE

Enable/Disable service autostart:

sudo systemctl enable/disable SERVICE

CentOS 6