Bash Geekcamp
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Towards a Smarter Bash
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hack bash into something that addresses the concerns of Don Norman and Jef Raskin to make your bash smarter than you are.
Transcript of Bash Geekcamp
Towards a Smarter Bash
HCI
Human
Computer
Barbara Blackburn
200 wpm = 200 * 5 * 8 / 60
= 133 bits/s
Towards a Smarter Bash
Howard Stephen Berg
25,000 wpm
he's a freak
2000 wpm = 1.3 kbits/s
Towards a Smarter Bash
V22.bis = Blazing Fast
For 1988
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Other Criticisms?
Towards a Smarter Bash
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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Towards a Smarter Bash
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 Bash
Towards a Smarter Human
Thanks!
http://haller.ws/projects/bash
