tmux

default prefix : Ctrl B

operation	keyboard shortcut
create a window	prefix c
delete a window	prefix &
delete a pane	Ctrl d
rename a window	prefix ,
create a horizontal pane	prefix %
create a vertical pane	prefix "
attach to a session	tmux attach -t <session-id>
move pane to a new window	prefix !
kill current session	prefix xkbmap us: kill-session
detach from currently attached session	prefix d

• search: https://superuser.com/questions/231002/how-can-i-search-within-the-output-buffer-of-a-tmux-shell

conda

• export the packages to a .yml file conda env export > environment.yml

• install the package from the .yml file conda env create -f environment.yml

  • the firt line in .yml file sets the new environment's name

• deactivate auto-loading of base environment since it is best-practice to not accidently install packages inside the base environment:

  conda config --set auto_activate_base false

jupyter notebook

command mode

operation	keyboard shortcut
undo cell deletion	Z
delete cell	D D
markdown cell to code cell	Y
code cell to markdown cell	M
select multiple cell	Shift Up/Down
merge selected cell	Shift M
copy current cell	C
cut currect cell	X
paste cells below	V
paste cells above	Shift V
show all shortcuts	H
enter edit mode	Enter
scroll the notebook down	Space
scroll the notebook up	Shift Space

edit mode

operation	keyboard shortcut
split cell at cursor	Ctrl Shift -/+
exti edit mode	Esc
show function arguments/documentation	Shift-Tab

• helper function: add a ? after the function and then run
• Ctrl Shift C: show command pallette
• %matplotlib qt: interactive plot mode
• %matplotlib inline: normal charts inside notebook

vim

git

• push local branch to a remote branch: git push <remote> <local_branch>:<remote_branch>

• pull a remote branch to a local branch git pull <remote> <remote_branch>:<local_branch>

  Note: git pull will only work at fast-forward merge. For non-fast-forward merge:

  $ git fetch <remote> <remote_branch>
  $ git merge <remote>/<remote_branch>
  

• show the difference of a file between current commit and one commit back: git diff HEAD^ HEAD main.c, between current commit and two commits back git diff HEAD^^ HEAD main.c

• git branch description:

  Edit branch description: git branch --edit-description

  View branch description: git config branch.BRANCHNAME.description

  source

• git tags:

  Add tags with message: git tag -a TAGNAME -m COMMENTS

  List tags: git tag -n99, note git tag will list tags without messages.

  Push all tags: git push --tags

PyCharm

Shift-Shift: open search bar

Alt-Enter: open pycharm suggestions

Ctrl-W: select the current word, press twice W select the current string, press more Ws futher to select wider scope; Ctrl-Shift-W to shrink selection.

Ctrl-Y: delete current line

Ctrl-D: duplicate selected line/ shortcut for copy-paste combined

Shift-UpperArrow: select from the current caret postion to one line above; press UpperArrow twince to select one more line

Shift-DownArrow: select from the current caret postion to one line below

Shift-LeftArrow or Shift-RightArrow: move the caret to left/right and select the text

Ctrl-Shift-UpperArrow: move current line up; if at the beginning of a block, the entire block wil be moved up.

Ctrl-Minus: collapse a code fragment

Ctrl-Equal: expand a code region

Ctrl-Shift-Minus: collapse all code regions

Ctrl-Shift-Equal: expand all code regions

Alt-J: select the symbol at the caret, press J agin to select the next occurence of this symbol.

Ctrl-Alt-Shift-J: select all occurences in the file (this is quite useful if you want to rename a variable and change its name in all occurences.

linux

• print the owner of a pid: ps -o user= -p PIDHERE

• zip a folder and exclude certain folders zip -r myarchive.zip dir1 -x dir1/ignoreDir1/\* dir1/ignoreDir2/\*

• bash short cuts:

  • Ctrl-U: to clear line before the cursor. The deleted command will be stored into a buffer.
  • Ctrl-K to clear line after the cursor.
  • Ctrl-Y to paste the deleted command.
  • Ctrl-E to jump to the end of the input line.
  • Ctrl-A to jump to the start of the input line.
  • Ctrl-C to abort what you're typing.
  • Ctrl-W to delete word on the left.
  • Alt-D to delete word on the right.
  • Alt-F to move one word forward.
  • Alt-B to move one word back.

• Search and run previous command:

  • Ctrl-r search for command
  • !{history-number} history number can be found at histrory command output

• grep search + next/previous lines:

  grep -A1 "PATTERN" example.txt
  OPTIONS
         -A NUM, --after-context=NUM
         -B NUM, --before-context=NUM
         -C NUM, --context=NUM
  

• show juyter notebook on server from local computer ssh -N -f -L localhost:$1:localhost:$2 user@server_ip

• open a file or URL in default pplication xdg-open {file URL}

• switch keyboard layout

  setxkbmap de switch to german keyboard

  setxkbmap us switch to us keyboard

• print directory size

  du -h -d 1: -h stands for human-readable, -d 1 prints only 1 level below the current directory

  du -hs: -s stands for summarize the total size

• report file system disk space usage: df -h

• remove all files exclude certrain files:

  rm -rf !(*.py): remove all files except for .py files

  rm -rf !(index*).html: remove all .html files except for those named index*.html(* is a wildcard here)

• pavucontrol: change volume above 100%

• set brightness of a display:

  xrandr --output $Monitor --brightness 1.0

  Note: $Monitor is in the list of xrandr --listmonitors, set brightness to a float number will dim the selected display, e.g 0.5 is half the current brightness

• change system font size

  gsettings set org.gnome.desktop.interface text-scaling-factor [scaling-factor-value]

• print Linux version lsb_release -a

• find my IP address: curl ifconfig.me

python tools

line profiler

Run and profile the .py script:

kernprof -l script_to_profile.py

View the profiler results stored in .lprof

python -m line_profiler script_to_profiler.py.lprof