diff --git a/HACKING.md b/HACKING.md
index 07308745..c0c35abd 100644
--- a/HACKING.md
+++ b/HACKING.md
@@ -289,6 +289,9 @@ on GitHub and most other Markdown renderers. -->
  *  Put utility flags in the ASCII order and **don't** group them together.  For
     example, `ls -1 -A -q`.
 
+ *  Script code lines should not be longer than one hundred (**100**) columns.
+    For comments, see the text section below.
+
  *  `snake_case`, not `camelCase` for variables.  `kebab-case` for filenames.
 
  *  UPPERCASE names for external exported variables, lowercase for local,
@@ -319,6 +322,14 @@ on GitHub and most other Markdown renderers. -->
     dir="${TOP_DIR}"/sub
     ```
 
+ *  When using `test` (aka `[`), spell compound conditions with `&&`, `||`, and
+    `!` **outside** of `test` instead of `-a`, `-o`, and `!` inside of `test`
+    correspondingly.  The latter ones are pretty much deprecated in POSIX.
+
+    See also: “[Problems With the `test` Builtin: What Does `-a` Mean?]”.
+
+    [Problems With the `test` Builtin: What Does `-a` Mean?]: https://www.oilshell.org/blog/2017/08/31.html
+
 ##  <a id="text-including-comments" href="#text-including-comments">Text, Including Comments</a>
 
  *  End sentences with appropriate punctuation.
diff --git a/bamboo-specs/release.yaml b/bamboo-specs/release.yaml
index 675bde40..85f09578 100644
--- a/bamboo-specs/release.yaml
+++ b/bamboo-specs/release.yaml
@@ -200,7 +200,7 @@
         set -e -f -u -x
 
         export CHANNEL="${bamboo.channel}"
-        if [ "$CHANNEL" != 'release' -a "${CHANNEL}" != 'beta' ]
+        if [ "$CHANNEL" != 'release' ] && [ "${CHANNEL}" != 'beta' ]
         then
               echo "don't publish to Github Releases for this channel"
 
diff --git a/scripts/make/build-docker.sh b/scripts/make/build-docker.sh
index 92adb4fb..19efcbed 100644
--- a/scripts/make/build-docker.sh
+++ b/scripts/make/build-docker.sh
@@ -18,7 +18,7 @@ readonly channel="$CHANNEL"
 readonly commit="$COMMIT"
 readonly dist_dir="$DIST_DIR"
 
-if [ "${VERSION:-}" = 'v0.0.0' -o "${VERSION:-}" = '' ]
+if [ "${VERSION:-}" = 'v0.0.0' ] || [ "${VERSION:-}" = '' ]
 then
 	readonly version="$(sh ./scripts/make/version.sh)"
 else
diff --git a/scripts/make/build-release.sh b/scripts/make/build-release.sh
index 104385b6..8454ff0c 100644
--- a/scripts/make/build-release.sh
+++ b/scripts/make/build-release.sh
@@ -48,7 +48,7 @@ readonly channel="$CHANNEL"
 
 # Check VERSION against the default value from the Makefile.  If it is
 # that, use the version calculation script.
-if [ "${VERSION:-}" = 'v0.0.0' -o "${VERSION:-}" = '' ]
+if [ "${VERSION:-}" = 'v0.0.0' ] || [ "${VERSION:-}" = '' ]
 then
 	readonly version="$(sh ./scripts/make/version.sh)"
 else
@@ -103,8 +103,8 @@ log "checking tools"
 # Make sure we fail gracefully if one of the tools we need is missing.
 for tool in gpg gzip sed sha256sum snapcraft tar zip
 do
-	which "$tool" >/dev/null ||\
-		{ log "pieces don't fit, '$tool' not found"; exit 1; }
+	which "$tool" >/dev/null\
+		|| { log "pieces don't fit, '$tool' not found"; exit 1; }
 done
 
 # Data section.  Arrange data into space-separated tables for read -r to
@@ -219,7 +219,7 @@ build() {
 
 	log "$build_archive"
 
-	if [ "$build_snap" = '0' -o "$snap_enabled" = '0' ]
+	if [ "$build_snap" = '0' ] || [ "$snap_enabled" = '0' ]
 	then
 		return
 	fi
@@ -262,8 +262,7 @@ build() {
 	# output, but only show it when snapcraft actually fails.
 	set +e
 	build_snapcraft_output="$(
-		snapcraft pack "$build_snap_dir"\
-			--output "$build_snap_output" 2>&1
+		snapcraft pack "$build_snap_dir" --output "$build_snap_output" 2>&1
 	)"
 	build_snapcraft_exit_code="$?"
 	set -e
@@ -334,10 +333,7 @@ log "calculating checksums"
 (
 	cd "./${dist}"
 
-	files="$( \
-		find . ! -name . -prune\
-			\( -name '*.tar.gz' -o -name '*.zip' \)
-	)"
+	files="$( find . ! -name . -prune \( -name '*.tar.gz' -o -name '*.zip' \) )"
 
 	# Don't use quotes to get word splitting.
 	sha256sum $files > ./checksums.txt
@@ -385,8 +381,7 @@ echo "
 # Same as with checksums above, don't use ls, because files matching one
 # of the patterns may be absent.
 readonly ar_files="$( \
-	find "./${dist}/" ! -name "${dist}" -prune\
-		\( -name '*.tar.gz' -o -name '*.zip' \)
+	find "./${dist}/" ! -name "${dist}" -prune \( -name '*.tar.gz' -o -name '*.zip' \)
 )"
 readonly ar_files_len="$(echo "$ar_files" | wc -l)"
 
diff --git a/scripts/make/go-build.sh b/scripts/make/go-build.sh
index aad1ab8a..610e9ab0 100644
--- a/scripts/make/go-build.sh
+++ b/scripts/make/go-build.sh
@@ -106,8 +106,7 @@ fi
 export CGO_ENABLED="$cgo_enabled"
 export GO111MODULE='on'
 
-readonly build_flags="${BUILD_FLAGS:-$race_flags $out_flags $par_flags\
-	$v_flags $x_flags}"
+readonly build_flags="${BUILD_FLAGS:-$race_flags $out_flags $par_flags $v_flags $x_flags}"
 
 # Don't use quotes with flag variables to get word splitting.
 "$go" generate $v_flags $x_flags ./main.go
diff --git a/scripts/make/go-lint.sh b/scripts/make/go-lint.sh
index 661edbe8..4ba752aa 100644
--- a/scripts/make/go-lint.sh
+++ b/scripts/make/go-lint.sh
@@ -157,8 +157,7 @@ ineffassign ./...
 
 unparam ./...
 
-git ls-files -- '*.go' '*.md' '*.mod' '*.sh' '*.yaml' '*.yml'\
-	'Makefile'\
+git ls-files -- '*.go' '*.md' '*.mod' '*.sh' '*.yaml' '*.yml' 'Makefile'\
 	| xargs misspell --error
 
 looppointer ./...
diff --git a/scripts/make/go-test.sh b/scripts/make/go-test.sh
index 0654157e..68368aa0 100644
--- a/scripts/make/go-test.sh
+++ b/scripts/make/go-test.sh
@@ -39,5 +39,4 @@ readonly count_flags='--count 1'
 
 # Don't use quotes with flag variables because we want an empty space if
 # those aren't set.
-"$go" test $count_flags $cover_flags $race_flags $timeout_flags\
-	$x_flags $v_flags ./...
+"$go" test $count_flags $cover_flags $race_flags $timeout_flags $x_flags $v_flags ./...