fix: command checks

Author: Mikhus

bin/ctl.sh

@@ -215,7 +215,7 @@ done
 
 if [[ 0 -eq "${#services[@]}" ]]; then
   # MacOSX patch, as long as it does not compatible with linux's grep -P
-  if [[ -x perl ]]; then
+  if command -v perl >/dev/null 2>&1; then
     service_entries=()
 
     while IFS= read -r -d '' file; do

bin/updep.sh

@@ -68,7 +68,7 @@ done
 
 # load services from path if they were not provided by command-line option
 if [[ 0 -eq "${#services[@]}" ]]; then
-    if [[ -x perl ]]; then
+    if command -v perl >/dev/null 2>&1; then
         service_entries=()
 
         while IFS= read -r -d '' file; do