Add bash/two-fer

bash/two-fer/README.md

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+# Two Fer
+
+`Two-fer` or `2-fer` is short for two for one. One for you and one for me.
+
+Given a name, return a string with the message:
+
+```text
+One for X, one for me.
+```
+
+Where X is the given name.
+
+However, if the name is missing, return the string:
+
+```text
+One for you, one for me.
+```
+
+Here are some examples:
+
+|Name    |String to return 
+|:-------|:------------------
+|Alice   |One for Alice, one for me. 
+|Bob     |One for Bob, one for me.
+|        |One for you, one for me.
+|Zaphod  |One for Zaphod, one for me.
+
+
+Run the tests with:
+
+```bash
+bats two_fer_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 two_fer_test.sh
+```
+
+## Source
+
+[https://github.com/exercism/problem-specifications/issues/757](https://github.com/exercism/problem-specifications/issues/757)
+
+
+## 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/two-fer/two_fer.sh

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+#!/usr/bin/env bash
+
+name="you"
+
+if [ "$#" -ge 1 ]; then
+    name=$1
+fi
+
+echo "One for $name, one for me."

bash/two-fer/two_fer_test.sh

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+#!/usr/bin/env bash
+
+@test "no name given" {
+  #[[ $BATS_RUN_SKIPPED == true  ]] || skip
+
+  # The above line controls whether to skip the test.
+  # Normally, we skip every test except for the first one
+  # (the first one is always commented out).  This allows for
+  # a person to focus on solving a test at a time: you can
+  # comment out or delete the
+  # `[[ $BATS_RUN_SKIPPED == true  ]] || skip`
+  # line to run the test when you are ready.
+  #
+  # You can also run the all the tests by setting the
+  # `$BATS_RUN_SKIPPED` environment variable, like this:
+  #
+  #     $ BATS_RUN_SKIPPED=true bats two_fer_test.sh
+
+  run bash two_fer.sh
+  [ "$status" -eq 0 ]
+  [ "$output" == "One for you, one for me." ]
+}
+
+@test "a name given" {
+  run bash two_fer.sh Alice
+  [ "$status" -eq 0 ]
+  [ "$output" == "One for Alice, one for me." ]
+}
+
+@test "another name given" {
+  run bash two_fer.sh Bob
+  [ "$status" -eq 0 ]
+  [ "$output" == "One for Bob, one for me." ]
+}
+
+@test "handle arg1 properly" {
+  run bash two_fer.sh "John Smith" "Mary Ann"
+  [ "$status" -eq 0 ]
+  [ "$output" == "One for John Smith, one for me." ]
+}