diff --git a/test-case/check-suspend-resume-with-audio.sh b/test-case/check-suspend-resume-with-audio.sh
index fa2fbe6a..3feba8bb 100755
--- a/test-case/check-suspend-resume-with-audio.sh
+++ b/test-case/check-suspend-resume-with-audio.sh
@@ -22,7 +22,9 @@ set -e
 ##    check kernel log and find no errors
 ##
 
-source $(dirname ${BASH_SOURCE[0]})/../case-lib/lib.sh
+TESTDIR=$(cd "$(dirname "${BASH_SOURCE[0]}")/" && pwd)
+# shellcheck source=case-lib/lib.sh
+source "${TESTDIR}"/../case-lib/lib.sh
 
 OPT_NAME['l']='loop'     OPT_DESC['l']='suspend/resume loop count'
 OPT_HAS_ARG['l']=1         OPT_VAL['l']=3
@@ -42,7 +44,7 @@ OPT_HAS_ARG['r']=0         OPT_VAL['r']=0
 OPT_NAME['m']='mode'     OPT_DESC['m']='alsa application type: playback/capture'
 OPT_HAS_ARG['m']=1         OPT_VAL['m']='playback'
 
-OPT_NAME['t']='tplg'     OPT_DESC['t']='tplg file, default value is env TPLG: $TPLG'
+OPT_NAME['t']='tplg'     OPT_DESC['t']="tplg file, default value is env TPLG: $TPLG"
 OPT_HAS_ARG['t']=1         OPT_VAL['t']="$TPLG"
 
 OPT_NAME['s']='sof-logger'   OPT_DESC['s']="Open sof-logger trace the data will store at $LOG_ROOT"
@@ -78,57 +80,54 @@ fi
 
 func_pipeline_export "$tplg" "type:${OPT_VAL['m']} & ${OPT_VAL['P']}"
 
+opt_arr=(-l "${OPT_VAL['l']}")
 if [ "${OPT_VAL['T']}" ]; then
-    opt="-l ${OPT_VAL['l']} -T ${OPT_VAL['T']}"
-else
-    opt="-l ${OPT_VAL['l']}"
+    opt_arr+=(-T "${OPT_VAL['T']}")
 fi
 if [ ${OPT_VAL['r']} -eq 0  ]; then
-    opt="$opt -S ${OPT_VAL['S']} -w ${OPT_VAL['w']}"
+    opt_arr+=(-S "${OPT_VAL['S']}" -w "${OPT_VAL['w']}")
 else
-    opt="$opt -r"
+    opt_arr+=(-r)
 fi
 
-for idx in $(seq 0 $(expr $PIPELINE_COUNT - 1))
+for idx in $(seq 0 $((PIPELINE_COUNT - 1)))
 do
     # set up checkpoint for each iteration
     setup_kernel_check_point
     # store local checkpoint as we have sub-test
     LOCAL_CHECK_POINT="$KERNEL_CHECKPOINT"
-    channel=$(func_pipeline_parse_value $idx channel)
-    rate=$(func_pipeline_parse_value $idx rate)
-    fmt=$(func_pipeline_parse_value $idx fmt)
-    dev=$(func_pipeline_parse_value $idx dev)
-    pcm=$(func_pipeline_parse_value $idx pcm)
-    snd=$(func_pipeline_parse_value $idx snd)
+    channel=$(func_pipeline_parse_value "$idx" channel)
+    rate=$(func_pipeline_parse_value "$idx" rate)
+    fmt=$(func_pipeline_parse_value "$idx" fmt)
+    dev=$(func_pipeline_parse_value "$idx" dev)
+    snd=$(func_pipeline_parse_value "$idx" snd)
     dlogi "Run $TYPE command for the background"
     cmd_args="$cmd -D$dev -r $rate -c $channel -f $fmt $file_name -q"
     dlogc "$cmd_args"
-    $cmd -D$dev -r $rate -c $channel -f $fmt $file_name -q  & process_id=$!
+    $cmd -D"$dev" -r "$rate" -c "$channel" -f "$fmt" "$file_name" -q  & process_id=$!
     # delay for process run
     sleep 1
     # check process status is correct
-    sof-process-state.sh $process_id
-    if [ $? -ne 0 ]; then
-        func_lib_lsof_error_dump $snd
+    sof-process-state.sh $process_id || {
+        func_lib_lsof_error_dump "$snd"
         dloge "error process state of $cmd"
         dlogi "dump ps for aplay & arecord"
-        ps -ef |grep -E 'aplay|arecord'
+        pgrep -fla "aplay|arecord"
         dlogi "dump ps for child process"
         ps --ppid $$ -f
         exit 1
-    fi
-    $(dirname ${BASH_SOURCE[0]})/check-suspend-resume.sh $(echo $opt) || die "suspend resume failed"
+    }
+    "${TESTDIR}"/check-suspend-resume.sh "${opt_arr[@]}"  || die "suspend resume failed"
 
     # check kernel log for each iteration to catch issues
     sof-kernel-log-check.sh "$LOCAL_CHECK_POINT" || die "Caught error in kernel log"
 
     # check process status is correct
     sof-process-state.sh $process_id || {
-        func_lib_lsof_error_dump $snd
+        func_lib_lsof_error_dump "$snd"
         dloge "process status is abnormal"
         dlogi "dump ps for aplay & arecord"
-        ps -ef |grep -E 'aplay|arecord'
+        pgrep -fla "aplay|arecord"
         dlogi "dump ps for child process"
         ps --ppid $$ -f
         exit 1