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bash/acronym/README.md

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+# Acronym
+
+Convert a phrase to its acronym.
+
+Techies love their TLA (Three Letter Acronyms)!
+
+Help generate some jargon by writing a program that converts a long name
+like Portable Network Graphics to its acronym (PNG).
+
+
+Run the tests with:
+
+```bash
+bats acronym_test.sh
+```
+
+After the first test(s) pass, continue by commenting out or removing the
+`[[ $BATS_RUN_SKIPPED == true ]] || skip` 
+annotations prepending other tests.
+
+To run all tests, including the ones with `skip` annotations, run:
+
+```bash
+BATS_RUN_SKIPPED=true bats acronym_test.sh
+```
+
+## Source
+
+Julien Vanier [https://github.com/monkbroc](https://github.com/monkbroc)
+
+
+## External utilities
+`Bash` is a language to write "scripts" -- programs that can call
+external tools, such as
+[`sed`](https://www.gnu.org/software/sed/),
+[`awk`](https://www.gnu.org/software/gawk/),
+[`date`](https://www.gnu.org/software/coreutils/manual/html_node/date-invocation.html)
+and even programs written in other programming languages, 
+like [`Python`](https://www.python.org/).
+This track does not restrict the usage of these utilities, and as long
+as your solution is portable between systems and does not require
+installation of third party applications, feel free to use them to solve
+the exercise.
+
+For an extra challenge, if you would like to have a better understanding
+of the language, try to re-implement the solution in pure `Bash`,
+without using any external tools. Note that there are some types of
+problems that bash cannot solve, such as performing floating point
+arithmetic and manipulating dates: for those, you must call out to an
+external tool.
+
+## Submitting Incomplete Solutions
+It's possible to submit an incomplete solution so you can see how others
+have completed the exercise.

bash/acronym/acronym.sh

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+#!/usr/bin/env bash
+# V1: original version
+# V2: final printf changeto avoid subshell
+
+# external tools: none
+
+# v1: initial version
+
+# set to mask to enable logs
+debug=0
+
+shopt -s extglob
+
+usage()  {
+    echo "acronym.sh word1 [...]" >&2
+    exit 1
+}
+
+# $1: log level, then strings to display.
+log () {
+    (( debug & $1 )) && shift && echo "${@}"
+}
+
+
+# check for basic errors. We will accept multiple args:
+# acronym.sh i love suchi = acronym "i love suchi"
+(( $# < 1 )) && usage
+
+# valid word separators
+VALID_SEPARATORS="-_*"
+
+# replace valid chars with space, merge args in 1 string
+words="${*//[$VALID_SEPARATORS]/ }"
+log 1 valid separators ${#words[@]} "$words"
+
+# remove remaining non alpha chars (keep blanks)
+words="${words//[^[:alpha:][:blank:]]/}"
+log 1 keep alpha "${words[@]}"
+
+# capitalize, make an array
+words=(${words^^})
+log 1 "words ${#words[@]} ${words[@]}"
+
+# print 1st chars
+printf -v result "%c" ${words[@]}
+log 1 result "$result"
+
+echo "$result"
+
+exit 0
+
+# Indent style for emacs
+# Local Variables:
+# sh-basic-offset: 4
+# sh-indentation: 4
+# indent-tabs-mode: nil
+# comment-column: 60
+# End: