Bash Geekcamp

Towards a Smarter Bash

HCI

Human

Computer

Barbara Blackburn

200 wpm = 200 * 5 * 8 / 60

= 133 bits/s


Howard Stephen Berg

25,000 wpm

he's a freak

2000 wpm = 1.3 kbits/s


V22.bis = Blazing Fast

For 1988

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Other Criticisms?


The Truth about UNIX:

the user interface is horrid (1981)

Inconsistent Syntax & Usage

Names do not map to Functionality

Feedback only occurs on Error

High Cognitive Load

He was absolutely correct

For 1981.

Bash 4.0

file.newfile.deletefile.properties

directory.newdirectory.deletedirectory.properties

...

alias file.new=”touch”alias file.delete=”rm”alias file.properties=”stat”

alias directory.new=”mkdir”alias directory.delete=”rmdir”alias directory.properties=”stat”

...

Mnemonics = Bash Completion

Alert Only On Error

He was wrong ;)

Written by Monkeys on Crack?

Snopes says True.

A computer shall not harm your work or, through inactivity, allow

your work to come to harm.

function rm() { mv $* ${TMP_DIR}/.}

set -C

A computer shall not waste your time or require you to do more work

than is strictly necessary

Shannon's Law

bits/s = frequency * log (1+S/N)

N = our typing error rate

shopt -s dirspell shopt -s cdspell

set completion-ignore-case on

To get any lazier, we need to do some real work

Huffman Coding

Vary storage size inversely with frequency

sort .bash_history | awk '{ print $1 }' | uniq -c | sort -rn | less

Create tiny aliases for the most common

me$ cd /var/tmpme$ ls

cd() { builtin cd "$@" # list first bunch of entries directory.contents.wide | head }

me$ chmod 0 lamers_fileme$ ls -l lamers_file

[[ ${PS1} = “” ]] && return file_change() { IFS= $@ shift for f in "$*" ; do if file.is_file "${f}"; then file.properties "${f}" fi done}

mv() { file_change command mv "$@"; }

chmod() { file_change command chmod "$@"; }

chown() { file_change command chown "$@"; }

touch() { file_change command touch "$@"; }

Smart Prompts

know that attention is precious

Seeing is believing?

sane_prompt() { export PROMPT_LAST_CMD_EXIT_CODE=$? history -a prompt_screen_shelltitle local pkts=$( prompt_pad

${TEXT_RED} prompt_network_loss ) # wifi, directory size # SVN/CVS/GIT repo status # disk usage, cpu usage, … PS1="${hms}${box}${disk}${cpu}${wifi}${pkts}${dirsize}${repo}${err}${wd}" [[ ${#PS1} -gt ${PROMPT_MAX_LENGTH} ]] &&

PS1="${PS1}\n" export PS1="${PS1}${sigil}${TEXT_BLACK} " export PROMPT_PREVIOUS_TIME=${SECONDS}}export PROMPT_COMMAND=sane_prompt

What about the Third Law?

sane_prompt() { ... # disabled by operator? [[ -e ${PROMPT_KILL_FILE} ]] && return

# box too busy, be nice local load=$( cpu_usage_as_int ) [[ ${load} -gt ${PROMPT_LOAD_MAX} ]] && { echo CPU LOAD ABOVE ${PROMPT_LOAD_MAX} return } ...}

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echo 0.102.83.12.74.96 |sed 's/\./ /g' | each word printf '”%02x:”' {}

Any Ruby Fans Here?

each() { ... if [[ "$1" = "word" ]]; then shift while read line; do for word in ${line}; do eval "${@/\{\}/\"${word}\"}" done done fi}

Completion = Speed

export TWITS=”${HOME}/.twits”twit() { url="https://twitter.com/statuses/update.xml" __add() { grep -q ^$1\$ ${TWITS} || echo $1 >> ${TWITS} } for word in $*; do [[ '@' = "${word/[^@]*/}" ]] && __add ${word} done output=$(curl -v -n -d status="$*" ${url} 2>&1) [[ $? != 0 ]] && echo ${output}}complete_twit() { local cur=${COMP_WORDS[COMP_CWORD]} COMPREPLY=( $( grep -i ${cur} ${TWITS} ) )}complete -F complete_twit twit

Future Work

# bash 4.0 error trappingcommand_not_found_handle() { local cmd="$*" read -p "errors> " \ -e \ -i "${cmd}" cmd ${cmd}}


Towards a Smarter Human

Thanks!

http://haller.ws/projects/bash

Technology

Bash Geekcamp