RichardBronosky

bash-plusx

A bash plugin to make files executable

Installation

Set up bash_plugins folder

(Skip this step if you already have a bash_plugins folder.)

{
# simply copy-pasta this whole block, or customize these vars and copy-pasta the rest

RichardBronosky

#!/bin/bash

# This function works with both GNU/Linux and macOS/BSD version of sed and grep
# Inspired by https://github.com/relaxdiego/renderest

render(){
    local template="$*"
    for varname in $(<<<"$template" grep -oE '\{\{([A-Za-z0-9_]+)\}\}' | sed -En 's/.*\{\{([A-Za-z0-9_]+)\}\}.*/\1/p' | sort | uniq); do
        template="$(<<<"$template" sed -E "s/\{\{$varname\}\}/$(sed 's_\\_\\\\\\\\_g;s_/_\\/_g' <<<"${!varname}")/g")"
    done

RichardBronosky

Pattern for using main and exports in Node.js

Demo

~/src/node-playground(master#%)[0]
$ cat example-main_and_exports.js
#!/usr/bin/env node

const lib = require('./lib.js')

RichardBronosky

#!/bin/bash

# curl -sL https://gist.github.com/RichardBronosky/04f3b830532ba8ba60f35b22752d88f2/raw/curl-bash-env | bash

cat <<EOF | less
# stdin_is_a_pipe
[[ -p /dev/stdin ]]; echo \$?
$([[ -p /dev/stdin ]]; echo $?)

# stdin_is_a_tty

RichardBronosky

#!/bin/bash

tput init

end=$(( $(tput colors)-1 ))
w=8
for c in $(seq 0 $end); do
    tput setaf $c
    [[ $c -ge $(( w*2 )) ]] && offset=2 || offset=0
    [[ $(((c+offset) % (w-offset))) -eq $(((w-offset)-1)) ]] && s=$'\n'|| s='   '

RichardBronosky

Shell Script Design Goals

• Don't avoid bashisms unless you know bash will be unavailable
  • Use #!/bin/bash rather than #!/bin/sh
  • If you are going to try to avoid bash, you must test on a system that does not have bash
• Always include a shebang #!
• Handle errors
  • Use set -eu (errexit & nounset)
• Sould be idemponent if read via source
• Use subshells to avoid leaking unintended variables into the parent scope

RichardBronosky

#!/bin/bash -eu

[[ -z ${1:-} ]] && \
    echo -e "\n""Usage: $0 executable_path [destination_path] ""\n" || \
    executable_path="${1:-}"
: $executable_path
destination_path="${2:-/usr/local/bin}"

exec="$( basename $executable_path )"
dir="$(  dirname  $executable_path )"

RichardBronosky

Thu Nov 14 12:11:48 EST 2019

RichardBronosky

Thu Nov 14 12:10:38 EST 2019

RichardBronosky

Fork your own Gist

It used to be possible to fork your own gists via the browser using a little JS magic. This is no longer the case. As an alternative, you can use Chris Wanstrath's https://github.com/defunkt/gist cli tool to do the next best thing.

Usage

gist-fork git@gist.github.com:fcc543f7f1cfba404caf5ce276cc0951.git