diff --git a/.github/workflows/test.yaml b/.github/workflows/test.yaml
index 537d9f56..11b6fad3 100644
--- a/.github/workflows/test.yaml
+++ b/.github/workflows/test.yaml
@@ -13,3 +13,10 @@ jobs:
     - uses: actions/checkout@v2
     - run: make test
     # - uses: mxschmitt/action-tmate@v3
+
+  style:
+    runs-on: ubuntu-latest
+
+    steps:
+    - uses: actions/checkout@v2
+    - run: make style-check
diff --git a/.shellcheckrc b/.shellcheckrc
new file mode 100644
index 00000000..14d56a9d
--- /dev/null
+++ b/.shellcheckrc
@@ -0,0 +1,5 @@
+shell=bash
+
+enable=quote-safe-variables
+
+disable=1091,2030,2031,2034
diff --git a/Makefile b/Makefile
index fbec8c38..43c5ff97 100644
--- a/Makefile
+++ b/Makefile
@@ -1,4 +1,5 @@
 SHELL := bash
+SHELL_FILES := $(shell file --mime-type bin/* | grep text/x-shellscript | cut -d: -f1)
 
 export ROOT := $(shell pwd)
 
@@ -48,6 +49,9 @@ test:
 	make gh-pages
 	make clean
 
+style-check:
+	shellcheck $(SHELL_FILES)
+
 add-new:
 	for f in new/*; do cp "$$f" "src/$${f#*-}"; done
 
diff --git a/bin/new-test-file b/bin/new-test-file
index e77313cc..97e9fca4 100755
--- a/bin/new-test-file
+++ b/bin/new-test-file
@@ -1,7 +1,9 @@
 #!/usr/bin/env bash
 
+# shellcheck disable=2034
 version=0.0.1
 
+# shellcheck disable=1090
 source "${ROOT:-$PWD}/.bpan/run-or-docker.bash"
 
 check() (
@@ -37,6 +39,7 @@ main() (
 )
 
 template() (
+  # shellcheck disable=1039
   cat <<...
 ---
 - name: <test title>
diff --git a/bin/new-test-id b/bin/new-test-id
index 419371ac..3b6ad39c 100755
--- a/bin/new-test-id
+++ b/bin/new-test-id
@@ -3,8 +3,7 @@
 (
   while true; do
     id=$(
-      cat /dev/urandom |
-      LC_ALL=C tr -cd A-HJ-NP-Z2-9 |
+      LC_ALL=C tr -cd A-HJ-NP-Z2-9 < /dev/urandom |
       fold -w4 |
       grep '[A-Z]' |
       grep '[0-9]' |
diff --git a/bin/run-all-parsers b/bin/run-all-parsers
index f67bc881..96e12c4e 100755
--- a/bin/run-all-parsers
+++ b/bin/run-all-parsers
@@ -8,6 +8,8 @@
 # It is used to run every test in the suite against each YAML parser.
 #
 #------------------------------------------------------------------------------
+# shellcheck disable=2030
+# shellcheck disable=2031
 
 set -e -u -o pipefail
 
@@ -15,6 +17,7 @@ main() (
   id=$ID
   tmp=/tmp/test/$id
 
+  # shellcheck disable=2086
   set -- $RUNNERS
 
   run-all-parsers "$@"
diff --git a/bin/suite-to-data b/bin/suite-to-data
index 376373d8..837964a6 100755
--- a/bin/suite-to-data
+++ b/bin/suite-to-data
@@ -7,10 +7,12 @@
 #
 #------------------------------------------------------------------------------
 
+# shellcheck disable=2034
 version=0.0.8
 
 RUN_OR_DOCKER_PULL=true
 
+# shellcheck disable=1090
 source "${ROOT:-$PWD}/.bpan/run-or-docker.bash"
 
 check() (
diff --git a/bin/tsv-to-new b/bin/tsv-to-new
index bd87e611..0248b50c 100755
--- a/bin/tsv-to-new
+++ b/bin/tsv-to-new
@@ -54,12 +54,13 @@ for line in "${each[@]}"; do
     shift
   done
 
-  if [[ $group && $group == $_group ]]; then
+  if [[ $group && $group == "$_group" ]]; then
     more=1
   else
     more=''
     id=$("$bin/new-test-id")
-    while [[ -f $dir/$id*.yaml ]]; do
+    # TODO
+    while [[ -f $dir/$id.yaml ]]; do
       id=$("$bin/new-test-id")
     done
     : $((i++))