diff --git a/hooks/_common.sh b/hooks/_common.sh
index ae221b4de..db34fe87c 100644
--- a/hooks/_common.sh
+++ b/hooks/_common.sh
@@ -6,7 +6,7 @@ set -eo pipefail
 # Arguments:
 #   script_dir - absolute path to hook dir location
 #######################################################################
-function common::initialize {
+common::initialize() {
   local -r script_dir=$1
   # source getopt function
   # shellcheck source=../lib_getopt
@@ -24,7 +24,7 @@ function common::initialize {
 #   $@ (array) all specified in `hooks.[].args` in
 #     `.pre-commit-config.yaml` and filenames.
 #######################################################################
-function common::parse_cmdline {
+common::parse_cmdline() {
   # common global arrays.
   # Populated via `common::parse_cmdline` and can be used inside hooks' functions
   declare -g -a ARGS=() HOOK_CONFIG=() FILES=()
@@ -66,7 +66,7 @@ function common::parse_cmdline {
 #   args (string with array) arguments that configure wrapped tool behavior
 #   files (array) filenames to check
 #######################################################################
-function common::per_dir_hook {
+common::per_dir_hook() {
   local -r args="$1"
   shift 1
   local -a -r files=("$@")
@@ -119,7 +119,7 @@ function common::per_dir_hook {
 # Outputs:
 #   Print out provided text to stdout
 #######################################################################
-function common::colorify {
+common::colorify() {
   # shellcheck disable=SC2034
   local -r red="\e[0m\e[31m"
   # shellcheck disable=SC2034
diff --git a/hooks/infracost_breakdown.sh b/hooks/infracost_breakdown.sh
index dc7bc51b1..ab72c2af4 100755
--- a/hooks/infracost_breakdown.sh
+++ b/hooks/infracost_breakdown.sh
@@ -6,7 +6,16 @@ readonly SCRIPT_DIR="$(dirname "$(realpath "${BASH_SOURCE[0]}")")"
 # shellcheck source=_common.sh
 . "$SCRIPT_DIR/_common.sh"
 
-function main {
+#######################################
+# main function
+# Globals:
+#   ARGS
+#   HOOK_CONFIG
+#   SCRIPT_DIR
+# Arguments:
+#  None
+#######################################
+main() {
   common::initialize "$SCRIPT_DIR"
   common::parse_cmdline "$@"
   # shellcheck disable=SC2153 # False positive
@@ -25,7 +34,7 @@ function main {
 #   Print out hook checks status (Passed/Failed), total monthly cost and
 #   diff, summary about infracost check (non-supported resources etc.)
 #######################################################################
-function infracost_breakdown_ {
+infracost_breakdown_() {
   local -r hook_config="$1"
   local args
   read -r -a args <<< "$2"
@@ -85,8 +94,8 @@ function infracost_breakdown_ {
     real_value="$(jq "${jq_check[0]}" <<< "$RESULTS")"
     compare_value="${jq_check[1]}${jq_check[2]}"
     # Check types
-    jq_check_type="$(jq -r "${jq_check[0]} | type" <<< "$RESULTS")"
-    compare_value_type="$(jq -r "$compare_value | type" <<< "$RESULTS")"
+    jq_check_type="$(jq -r "${jq_check[0]} | type" <<<"$RESULTS")"
+    compare_value_type="$(jq -r "$compare_value | type" <<<"$RESULTS")"
     # Fail if comparing different types
     if [ "$jq_check_type" != "$compare_value_type" ]; then
       common::colorify "yellow" "Warning: Comparing values with different types may give incorrect result"
@@ -127,12 +136,15 @@ function infracost_breakdown_ {
 
   echo -e "\nSummary: $(jq -r '.summary' <<< "$RESULTS")"
 
-  echo -e "\nTotal Monthly Cost:        $(jq -r .totalMonthlyCost <<< "$RESULTS") $currency"
-  echo "Total Monthly Cost (diff): $(jq -r .projects[].diff.totalMonthlyCost <<< "$RESULTS") $currency"
+  echo -e "\nTotal Monthly Cost:        $(jq -r .totalMonthlyCost <<<"$RESULTS") $currency"
+  echo "Total Monthly Cost (diff): $(jq -r .projects[].diff.totalMonthlyCost <<<"$RESULTS") $currency"
 
   if $have_failed_checks; then
     exit 1
   fi
 }
 
+
+
+
 [ "${BASH_SOURCE[0]}" != "$0" ] || main "$@"
diff --git a/hooks/terraform_docs.sh b/hooks/terraform_docs.sh
index e71aae474..d3fbea38a 100755
--- a/hooks/terraform_docs.sh
+++ b/hooks/terraform_docs.sh
@@ -6,7 +6,17 @@ readonly SCRIPT_DIR="$(dirname "$(realpath "${BASH_SOURCE[0]}")")"
 # shellcheck source=_common.sh
 . "$SCRIPT_DIR/_common.sh"
 
-function main {
+#######################################
+# main function
+# Globals:
+#   ARGS
+#   FILES
+#   HOOK_CONFIG
+#   SCRIPT_DIR
+# Arguments:
+#  None
+#######################################
+main() {
   common::initialize "$SCRIPT_DIR"
   common::parse_cmdline "$@"
   # Support for setting relative PATH to .terraform-docs.yml config.
@@ -25,7 +35,7 @@ function main {
 #   args (string with array) arguments that configure wrapped tool behavior
 #   files (array) filenames to check
 #######################################################################
-function terraform_docs_ {
+terraform_docs_() {
   local -r hook_config="$1"
   local -r args="$2"
   shift 2
@@ -81,7 +91,7 @@ function terraform_docs_ {
 #   args (string with array) arguments that configure wrapped tool behavior
 #   files (array) filenames to check
 #######################################################################
-function terraform_docs {
+terraform_docs() {
   local -r terraform_docs_awk_file="$1"
   local -r hook_config="$2"
   local -r args="$3"
@@ -141,8 +151,8 @@ function terraform_docs {
     #
     if $create_if_not_exist && [[ ! -f "$text_file" ]]; then
       dir_have_tf_files="$(
-        find . -maxdepth 1 -type f | sed 's|.*\.||' | sort -u | grep -oE '^tf$|^tfvars$' ||
-          exit 0
+        find . -maxdepth 1 -type f | sed 's|.*\.||' | sort -u | grep -oE '^tf$|^tfvars$' \
+          || exit 0
       )"
 
       # if no TF files - skip dir
@@ -209,7 +219,7 @@ function terraform_docs {
 # Arguments:
 #   output_file (string) filename where hack will be written to
 #######################################################################
-function terraform_docs_awk {
+terraform_docs_awk() {
   local -r output_file=$1
 
   cat << "EOF" > "$output_file"
@@ -368,4 +378,7 @@ EOF
 
 }
 
+
+
+
 [ "${BASH_SOURCE[0]}" != "$0" ] || main "$@"
diff --git a/hooks/terraform_fmt.sh b/hooks/terraform_fmt.sh
index 84746a62b..645419d57 100755
--- a/hooks/terraform_fmt.sh
+++ b/hooks/terraform_fmt.sh
@@ -6,7 +6,16 @@ readonly SCRIPT_DIR="$(dirname "$(realpath "${BASH_SOURCE[0]}")")"
 # shellcheck source=_common.sh
 . "$SCRIPT_DIR/_common.sh"
 
-function main {
+#######################################
+# main function
+# Globals:
+#   ARGS
+#   FILES
+#   SCRIPT_DIR
+# Arguments:
+#  None
+#######################################
+main() {
   common::initialize "$SCRIPT_DIR"
   common::parse_cmdline "$@"
   # shellcheck disable=SC2153 # False positive
@@ -26,7 +35,7 @@ function main {
 #   args (string with array) arguments that configure wrapped tool behavior
 #   files (array) filenames to check
 #######################################################################
-function terraform_fmt_ {
+terraform_fmt_() {
   local -r args="$1"
   shift 1
   local -a -r files=("$@")
@@ -70,7 +79,7 @@ function terraform_fmt_ {
   # terraform.tfvars are excluded by `terraform fmt`
   for tfvars_file in "${tfvars_files[@]}"; do
     tfvars_file="${tfvars_file//__REPLACED__SPACE__/ }"
-
+  # shellcheck disable=SC2153 # False positive
     terraform fmt "${ARGS[@]}" "$tfvars_file"
     local exit_code=$?
     if [ $exit_code -ne 0 ]; then
@@ -95,7 +104,7 @@ function terraform_fmt_ {
 # Outputs:
 #   If failed - print out hook checks status
 #######################################################################
-function per_dir_hook_unique_part {
+per_dir_hook_unique_part() {
   local -r args="$1"
   local -r dir_path="$2"
 
@@ -108,4 +117,7 @@ function per_dir_hook_unique_part {
   return $exit_code
 }
 
+
+
+
 [ "${BASH_SOURCE[0]}" != "$0" ] || main "$@"
diff --git a/hooks/terraform_providers_lock.sh b/hooks/terraform_providers_lock.sh
index 510ff3b4d..5e46832b8 100755
--- a/hooks/terraform_providers_lock.sh
+++ b/hooks/terraform_providers_lock.sh
@@ -7,7 +7,16 @@ readonly SCRIPT_DIR="$(dirname "$(realpath "${BASH_SOURCE[0]}")")"
 # shellcheck source=_common.sh
 . "$SCRIPT_DIR/_common.sh"
 
-function main {
+#######################################
+# main function
+# Globals:
+#   ARGS
+#   FILES
+#   SCRIPT_DIR
+# Arguments:
+#  None
+#######################################
+main() {
   common::initialize "$SCRIPT_DIR"
   common::parse_cmdline "$@"
   # shellcheck disable=SC2153 # False positive
@@ -24,7 +33,7 @@ function main {
 # Outputs:
 #   If failed - print out hook checks status
 #######################################################################
-function per_dir_hook_unique_part {
+per_dir_hook_unique_part() {
   local -r args="$1"
   local -r dir_path="$2"
 
@@ -48,4 +57,5 @@ function per_dir_hook_unique_part {
   return $exit_code
 }
 
+
 [ "${BASH_SOURCE[0]}" != "$0" ] || main "$@"
diff --git a/hooks/terraform_tflint.sh b/hooks/terraform_tflint.sh
index b3788a92e..802697635 100755
--- a/hooks/terraform_tflint.sh
+++ b/hooks/terraform_tflint.sh
@@ -7,7 +7,16 @@ readonly SCRIPT_DIR="$(dirname "$(realpath "${BASH_SOURCE[0]}")")"
 # shellcheck source=_common.sh
 . "$SCRIPT_DIR/_common.sh"
 
-function main {
+#######################################
+# main function
+# Globals:
+#   ARGS
+#   FILES
+#   SCRIPT_DIR
+# Arguments:
+#  None
+#######################################
+main() {
   common::initialize "$SCRIPT_DIR"
   common::parse_cmdline "$@"
   # Support for setting PATH to repo root.
@@ -27,7 +36,7 @@ function main {
 # Outputs:
 #   If failed - print out hook checks status
 #######################################################################
-function per_dir_hook_unique_part {
+per_dir_hook_unique_part() {
   local -r args="$1"
   local -r dir_path="$2"
 
@@ -45,4 +54,6 @@ function per_dir_hook_unique_part {
   return $exit_code
 }
 
+
+
 [ "${BASH_SOURCE[0]}" != "$0" ] || main "$@"
diff --git a/hooks/terraform_tfsec.sh b/hooks/terraform_tfsec.sh
index f39c0285d..472c00291 100755
--- a/hooks/terraform_tfsec.sh
+++ b/hooks/terraform_tfsec.sh
@@ -6,7 +6,16 @@ readonly SCRIPT_DIR="$(dirname "$(realpath "${BASH_SOURCE[0]}")")"
 # shellcheck source=_common.sh
 . "$SCRIPT_DIR/_common.sh"
 
-function main {
+#######################################
+# main function
+# Globals:
+#   ARGS
+#   FILES
+#   SCRIPT_DIR
+# Arguments:
+#  None
+#######################################
+main() {
   common::initialize "$SCRIPT_DIR"
   common::parse_cmdline "$@"
   # Support for setting PATH to repo root.
@@ -26,7 +35,7 @@ function main {
 # Outputs:
 #   If failed - print out hook checks status
 #######################################################################
-function per_dir_hook_unique_part {
+per_dir_hook_unique_part() {
   local -r args="$1"
   # shellcheck disable=SC2034 # Unused var.
   local -r dir_path="$2"
@@ -40,4 +49,6 @@ function per_dir_hook_unique_part {
   return $exit_code
 }
 
+
+
 [ "${BASH_SOURCE[0]}" != "$0" ] || main "$@"
diff --git a/hooks/terraform_validate.sh b/hooks/terraform_validate.sh
index a123d5fbd..a85fff0da 100755
--- a/hooks/terraform_validate.sh
+++ b/hooks/terraform_validate.sh
@@ -6,15 +6,22 @@ readonly SCRIPT_DIR="$(dirname "$(realpath "${BASH_SOURCE[0]}")")"
 # shellcheck source=_common.sh
 . "$SCRIPT_DIR/_common.sh"
 
-# `terraform validate` requires this env variable to be set
-export AWS_DEFAULT_REGION=${AWS_DEFAULT_REGION:-us-east-1}
-
-function main {
+#######################################
+# main function
+# Globals:
+#   SCRIPT_DIR
+# Arguments:
+#  None
+#######################################
+main() {
   common::initialize "$SCRIPT_DIR"
   parse_cmdline_ "$@"
   terraform_validate_
 }
 
+# `terraform validate` requires this env variable to be set
+export AWS_DEFAULT_REGION=${AWS_DEFAULT_REGION:-us-east-1}
+
 #######################################################################
 # Parse args and filenames passed to script and populate respective
 # global variables with appropriate values
@@ -28,7 +35,7 @@ function main {
 #   $@ (array) all specified in `hooks.[].args` in
 #     `.pre-commit-config.yaml` and filenames.
 #######################################################################
-function parse_cmdline_ {
+parse_cmdline_() {
   declare argv
   argv=$(getopt -o e:i:a: --long envs:,init-args:,args: -- "$@") || return
   eval "set -- $argv"
@@ -77,7 +84,7 @@ function parse_cmdline_ {
 # Outputs:
 #   If failed - print out hook checks status
 #######################################################################
-function terraform_validate_ {
+terraform_validate_() {
 
   # Setup environment variables
   local var var_name var_value
@@ -144,6 +151,8 @@ function terraform_validate_ {
   fi
 }
 
+
+
 # global arrays
 declare -a INIT_ARGS
 declare -a ENVS
diff --git a/hooks/terragrunt_fmt.sh b/hooks/terragrunt_fmt.sh
index c750241df..07235a6ce 100755
--- a/hooks/terragrunt_fmt.sh
+++ b/hooks/terragrunt_fmt.sh
@@ -6,7 +6,16 @@ readonly SCRIPT_DIR="$(dirname "$(realpath "${BASH_SOURCE[0]}")")"
 # shellcheck source=_common.sh
 . "$SCRIPT_DIR/_common.sh"
 
-function main {
+#######################################
+# main function
+# Globals:
+#   ARGS
+#   FILES
+#   SCRIPT_DIR
+# Arguments:
+#  None
+#######################################
+main() {
   common::initialize "$SCRIPT_DIR"
   common::parse_cmdline "$@"
   # shellcheck disable=SC2153 # False positive
@@ -23,7 +32,7 @@ function main {
 # Outputs:
 #   If failed - print out hook checks status
 #######################################################################
-function per_dir_hook_unique_part {
+per_dir_hook_unique_part() {
   local -r args="$1"
   # shellcheck disable=SC2034 # Unused var.
   local -r dir_path="$2"
diff --git a/hooks/terragrunt_validate.sh b/hooks/terragrunt_validate.sh
index e68497eea..bd385fe0b 100755
--- a/hooks/terragrunt_validate.sh
+++ b/hooks/terragrunt_validate.sh
@@ -6,7 +6,16 @@ readonly SCRIPT_DIR="$(dirname "$(realpath "${BASH_SOURCE[0]}")")"
 # shellcheck source=_common.sh
 . "$SCRIPT_DIR/_common.sh"
 
-function main {
+#######################################
+# main function
+# Globals:
+#   ARGS
+#   FILES
+#   SCRIPT_DIR
+# Arguments:
+#  None
+#######################################
+main() {
   common::initialize "$SCRIPT_DIR"
   common::parse_cmdline "$@"
   # shellcheck disable=SC2153 # False positive
@@ -23,7 +32,7 @@ function main {
 # Outputs:
 #   If failed - print out hook checks status
 #######################################################################
-function per_dir_hook_unique_part {
+per_dir_hook_unique_part() {
   local -r args="$1"
   # shellcheck disable=SC2034 # Unused var.
   local -r dir_path="$2"
diff --git a/hooks/terrascan.sh b/hooks/terrascan.sh
index 31315aadd..59a50b20f 100755
--- a/hooks/terrascan.sh
+++ b/hooks/terrascan.sh
@@ -6,7 +6,16 @@ readonly SCRIPT_DIR="$(dirname "$(realpath "${BASH_SOURCE[0]}")")"
 # shellcheck source=_common.sh
 . "$SCRIPT_DIR/_common.sh"
 
-function main {
+#######################################
+# main function
+# Globals:
+#   ARGS
+#   FILES
+#   SCRIPT_DIR
+# Arguments:
+#  None
+#######################################
+main() {
   common::initialize "$SCRIPT_DIR"
   common::parse_cmdline "$@"
   # shellcheck disable=SC2153 # False positive
@@ -23,7 +32,7 @@ function main {
 # Outputs:
 #   If failed - print out hook checks status
 #######################################################################
-function per_dir_hook_unique_part {
+per_dir_hook_unique_part() {
   local -r args="$1"
   # shellcheck disable=SC2034 # Unused var.
   local -r dir_path="$2"
diff --git a/tests/hooks_performance_test.sh b/tests/hooks_performance_test.sh
index 4f35fce23..b06033a94 100755
--- a/tests/hooks_performance_test.sh
+++ b/tests/hooks_performance_test.sh
@@ -6,7 +6,7 @@ TEST_DIR=$3                            # '/tmp/infrastructure'
 TEST_DESCRIPTION="$TEST_NUM runs '$4'" # '`terraform_tfsec` PR #123:'
 RAW_TEST_RESULTS_FILE_NAME=$5          # terraform_tfsec_pr123
 
-function run_tests {
+run_tests() {
   local TEST_NUM=$1
   local TEST_DIR=$2
   local TEST_COMMAND
@@ -31,7 +31,7 @@ function run_tests {
   cd - > /dev/null
 }
 
-function generate_table {
+generate_table() {
   local FILE_PATH="tests/results/$1"
 
   local users_seconds system_seconds cpu total_time
@@ -74,7 +74,7 @@ function generate_table {
 "
 }
 
-function save_result {
+save_result() {
   local DESCRIPTION=$1
   local TABLE=$2
   local TEST_RUN_START_TIME=$3