| # Stereo record - dual channels | |
| arecord -f cd -D plughw:1,0 -d 20 test.wav | |
| # Mono - single channel | |
| arecord -f S16_LE -D plughw:1,0 -d 20 -r 16000 test.wav | |
| #read | |
| pocketsphinx_continuous -samprate 16000/8000/48000 -infile test.wav |
| If you encounter this error while `sudo apt-get update` on Debian | |
| W: GPG error: http://ftp.debian.org experimental Release: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY 8B48AD6246925553 NO_PUBKEY 7638D0442B90D010 | |
| _Solution_ | |
| $ gpg --keyserver pgpkeys.mit.edu --recv-key 8B48AD6246925553 | |
| $ gpg -a --export 8B48AD6246925553|sudo apt-key add - | |
| $ gpg --keyserver pgpkeys.mit.edu --recv-key 7638D0442B90D010 | |
| $ gpg -a --export 7638D0442B90D010|sudo apt-key add - |
| diskUtil unmountDisk /dev/disk2 | |
| sudo dd bs=1m if=2015-01-31-raspbian_x300.img of=/dev/rdisk2 |
| Do the following: | |
| grep -rnw '/path/to/somewhere/' -e "pattern" | |
| grep --exclude=\*.{o,a,.so} -rnw '.' -e "msse" | |
| -r or -R is recursive, -n is line number and -w stands match the whole word. -l (letter L) can be added to have just the file name. | |
| Along with these, --exclude or --include parameter could be used for efficient searching. Something like below: |
Install rmate on remote server that stores the files for editing
gem install rmate (you may need to add sudo)
SSH into the remote server using this syntax
ssh -R 52698:localhost:52698 pi@192.168.1.186 (change the username@host accordingly)
inside remote server, run rmate
| #!/bin/bash | |
| for sysdevpath in $(find /sys/bus/usb/devices/usb*/ -name dev); do | |
| ( | |
| syspath="${sysdevpath%/dev}" | |
| devname="$(udevadm info -q name -p $syspath)" | |
| [[ "$devname" == "bus/"* ]] && continue | |
| eval "$(udevadm info -q property --export -p $syspath)" | |
| [[ -z "$ID_SERIAL" ]] && continue | |
| echo "/dev/$devname - $ID_SERIAL" |
| ###### FORCE DATA FORMAT IN PANDAS ###### | |
| pd.options.display.float_format = '{:,.2f}'.format | |
| # NOTES: | |
| # 1. DO NOT update row in df.iterrows() -> https://stackoverflow.com/questions/25478528/updating-value-in-iterrow-for-pandas | |
| # Use df.loc[idx, '<col>'] = <value> | |
| ###### REGEX on DataFrame ###### |
| # RPN Calculator | |
| # | |
| # SPECIFICATIONS: | |
| # REQ 1: The calculator should use standard input and standard output, unless the language makes that impossible. | |
| # REQ 2: It should implement the four standard arithmetic operators | |
| # REQ 3: It should support negative and decimal numbers, and should not have arbitrary limits on the number of operations. | |
| # REQ 4: The calculator should not allow invalid or undefined behavior. | |
| # REQ 5: The calculator should exit when it receives a q command or an end of input indicator (EOF). | |
| class RpnStack |
| ffmpeg -loop 1 -i image.jpg -i audio.mp3 -shortest -c:v libx264 -c:a copy result.mkv |
| ./ethdcrminer64 -epool us1.ethpool.org:3333 -ewal 0x06592611735ef26f2fff83654879dbca72c364b0.rig2 -epsw x -dpool dcr.suprnova.cc:3252 -dwal stevenvo.rig2 -dpsw x |