Bash

https://stackoverflow.com/questions/17029902/using-curl-post-with-variables-defined-in-bash-script-functions

https://stackoverflow.com/questions/2500436/how-does-cat-eof-work-in-bash

http://goo.gl/ZThKCj - printing strings help

http://goo.gl/HnPkiq - arithmetic operator

http://goo.gl/g6xtca - arrays

http://goo.gl/xRHo3u - parameter expansion

https://github.com/aperezdc/perezdecastro.org/blob/master/stash/using-boolean-variables-in-bash.markdown - flag variables in bourne shell

https://kvz.io/blog/2013/11/21/bash-best-practices/ - boiler plate and best practice guide

Bash 4

http://clubmate.fi/upgrade-to-bash-4-in-mac-os-x/

Post upgrade to use bash 4 in script. change shebang line

#!/usr/local/bin/bash

Configure terminal to use it

# Add the new shell to the list of allowed shells
sudo bash -c 'echo /usr/local/bin/bash >> /etc/shells'
# Change to the new shell
chsh -s /usr/local/bin/bash

sed

appending newlines with mac: https://stackoverflow.com/questions/16576197/how-to-add-new-line-using-sed-mac

echo foo | sed 's/f/f\'$'\n/'

tokens=$(echo "$tokens" | sed ' /^[[:space:]]*}/a \
 \
  ')

tokens=$(echo "${tokens}" | sed ' /^\s*$/d;s/},/}/;s/}/}\'$'\n\\\n/; ')

https://lists.freebsd.org/pipermail/freebsd-questions/2009-March/194500.html - example to safe replace with newlines

a="This
 is
 the
 input
 from the
 web server"
b=`echo $a`
sed "s/foo/$b/"

https://taoofmac.com/space/cli/sed - examples

https://stackoverflow.com/questions/29613304/is-it-possible-to-escape-regex-metacharacters-reliably-with-sed - more whitespacing issues

awk

echo "${tokens}" | awk 'BEGIN { RS=""; FS=/,/; }; $0 ~ "[email protected]" { print }'

escaping quotes

https://stackoverflow.com/questions/13799789/expansion-of-variable-inside-single-quotes-in-a-command-in-bash

wrap with single quote and expand variable

grep '^'"${APP_NAME}"''

args and help

https://argbash.io/generate

http://spf13.com/post/easy-bash-scripting-with-shflags/ - documentation module

shflags

https://github.com/kward/shflags

Install

1. Download
2. link to path

   ln ~/data/tools/shflags-1.2.2/shflags /usr/local/bin/shflags
   

3. execute

lint/static analysis

https://github.com/koalaman/shellcheck

brew install shellcheck

execute

shellcheck script.sh