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Network

  • lsof -i
  • netstat -rn # see routing tables - "default" is router.
  • sudo ngrep -d any "github" # print all packets matching a regex
    • alternative: capture with tcpdump, then filter with wireshark frame contains "foo".

Process' file usage

  • htop followed by l
  • check current read position in file: lsof -p <pid> -o or lsof -o <filename>

Readline

  • expand inline: C-M-e, C-x *
  • jump to char:: C-]

Bash

  • type ls
  • diff <(sort .bashrc) <(sort .bash_profile)

find

  • find young files:
    • Linux: find . -mmin -60 -exec stat -c "%y %n" {} \;
    • OSX: find . -mmin -60 -exec stat -f "%Sm %N" {} \;

rename

  • dry-run: rename -n
  • sanitize: rename -z
  • perl (sed-like): rename -e 's/.*(?=[0-9])//' *
  • numbering: rename -N ...01 -e 's/^/$N/' *

csv

  • pip3 install csvkit
  • csvcut -c bar,baz foo.csv

emacs

key effect
M-x menu-bar-open, F10
C-h k chord get help on chord
region `M- pbcopy`
C-x {2,3} view current buffer in two "windows"
C-x 1 close all other "windows"
C-x 0 close this "window"
C-x C-f view a file
M-> end of buffer
M-^ join previous line
M-m move to first character on line
M-g g linenum Go to linenum
C-M-{n,p} matching paren
M-l move window around cursor
M-r move cursor to center of window
C-q tab Indent a literal tab
C-u 0 C-k kill-line-backwards
C-x tab Enter indentation mode (sometimes need C-u)
{C,M}-t Jump {forwards, backwards} to a character
C-c C-{f,b} HTML-mode: Go to matching tag
M-z char Delete until char

emacs + python

  • C-M-a
  • C-M-e
  • M-a
  • M-e
  • C-M-f
  • C-M-b
  • toggle comment: (select region) M-;

python

  • postmortem debugger: python3 -m pdb foo.py
    • stack: where, up, down
    • run code:: !, p, pp, interact
    • context: list, list start, end, args

encryption

tar -cz foo | openssl aes-256-cbc > foo.tar.gz.a2c
mkdir -p foo2 && cat foo.tar.gz.a2c | openssl aes-256-cbc -d | tar -xz -C foo2

export GPG_TTY=$(tty) && tar -cz foo | gpg -c > foo.tar.gz.gpg
mkdir -p foo2 && cat foo.tar.gz.gpg | gpg -d | tar -xz -C foo2

zip -e -r foo foo
unzip -d foo2 foo.zip

gif

ffmpeg -i IMG_1246.m4v -s 360x640 -pix_fmt rgb24 -r 10 -f gif - | gifsicle --optimize=3 --delay=10 > out.gif