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diff --git a/_notes/bash.md b/_notes/bash.md
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----
-title: Bash
-subtitle: best practices
-layout: plain
----
-
-Arrays
-------
-
-### Declaration
-
-<div class="row">
-  <div class="col-md-6" markdown="1">
-
-```bash
-local -a xs=()
-declare -a xs=()
-local -A xs=()
-declare -A xs=()
-
-# Works with nounset:
-echo "${#xs[@]}"
-```
-
-  </div>
-  <div class="col-md-6" markdown="1">
-
-```bash
-local -a xs
-declare -a xs
-local -A xs
-declare -A xs
-
-# Doesn't work with nounset:
-echo "${#xs[@]}"
-```
-
-  </div>
-</div>
-
-### Expansion
-
-<div class="row">
-  <div class="col-md-6" markdown="1">
-
-```bash
-func ${arr[@]+"${arr[@]}"}
-```
-
-  </div>
-  <div class="col-md-6" markdown="1">
-
-```bash
-# Doesn't work with nounset:
-func "${arr[@]}"
-# Doesn't work properly with `declare -a arr=('')`:
-func "${arr[@]+"${arr[@]}"}"
-```
-
-  </div>
-</div>
-
-### `unset`
-
-<div class="row">
-  <div class="col-md-6" markdown="1">
-
-```bash
-unset -v 'arr[x]'
-unset -v 'arr[$i]'
-```
-
-  </div>
-  <div class="col-md-6" markdown="1">
-
-```bash
-# May break due to globbing:
-unset -v arr[x]
-# In addition, possible quoting problem:
-unset -v arr[$i]
-# Doesn't work for some reason:
-unset -v 'arr["x"]'
-unset -v 'arr["]"]'
-# Also rejected:
-unset -v 'arr["$i"]'
-
-# An insightful discussion on the topic:
-# https://lists.gnu.org/archive/html/help-bash/2016-09/msg00020.html
-```
-
-  </div>
-</div>
-
-`errexit`
----------
-
-I hate this feature, and I especially hate people who prefer "standards" over
-useful behaviour.
-
-### Command substitution
-
-<div class="row">
-  <div class="col-md-6" markdown="1">
-
-```bash
-# Without this, bar will be executed w/ errexit disabled!
-shopt -s inherit_errexit
-
-bar() {
-    false
-    echo 'should never see this' >&2
-}
-
-bar_output="$( bar )"
-foo "$bar_output"
-```
-
-  </div>
-  <div class="col-md-6" markdown="1">
-
-```bash
-bar() {
-    false
-    echo 'should never see this' >&2
-}
-
-# Even with errexit, foo will still get executed.
-# More than that, the script will print 'should never see this'!
-foo "$( bar )"
-```
-
-  </div>
-</div>
-
-### Process substitution
-
-<div class="row">
-  <div class="col-md-6" markdown="1">
-
-```bash
-shopt -s lastpipe
-
-command | while IFS= read -r line; do
-    process_line "$line"
-done
-```
-
-  </div>
-  <div class="col-md-6" markdown="1">
-
-```bash
-# Without lastpipe, you cannot pipe into read:
-command | while IFS= read -r line; do
-    process_line "$line"
-done
-```
-
-```bash
-# errexit doesn't work here no matter what:
-while IFS= read -r line; do
-    process_line "$line"
-done < <( command )
-echo 'should never see this'
-```
-
-```bash
-# This would break if $output contains the \0 byte:
-output="$( command )"
-
-while IFS= read -r line; do
-    process_line "$line"
-done <<< "$output"
-```
-
-  </div>
-</div>
-
-### Functions
-
-<div class="row">
-  <div class="col-md-6" markdown="1">
-
-```bash
-foo() {
-    false
-    echo 'should never see this' >&2
-}
-
-foo
-echo ok
-```
-
-  </div>
-  <div class="col-md-6" markdown="1">
-
-```bash
-# foo will still print 'should never see this'.
-if foo; then
-    echo ok
-fi
-
-# Same below.
-foo && echo ok
-foo || echo ok
-```
-
-  </div>
-</div>