improve multiply var declaration/read

- read multiply var instead array
- simplify the multiply local var deceleration

bin/echo-args

@@ -9,9 +9,7 @@ readonly ec=$'\033'      # escape char
 readonly eend=$'\033[0m' # escape end
 
 echoArg() {
-    local index=$1
-    local count=$2
-    local value=$3
+    local index="$1" count="$2" value="$3"
 
     # if stdout is console, turn on color output.
     [ -t 1 ] &&

bin/find-in-jars

@@ -233,8 +233,7 @@ readonly total_count="$(echo $(echo "$jar_files" | wc -l))"
 findInJarFiles() {
     $is_console && local -r grep_color_option='--color=always'
 
-    local counter=1
-    local jar_file
+    local counter=1 jar_file
     while read jar_file; do
         printResponsiveMessage "finding in jar($((counter++))/$total_count): $jar_file"
 

bin/show-busy-java-threads

@@ -353,14 +353,10 @@ __complete_pid_user_by_ps() {
         echo "$ps_out" | logAndCat "${ps_cmd_line[@]}" > "${store_file_prefix}$(( i + 1 ))_ps"
     fi
 
-    local idx=0
-    local -a line
-    while IFS=" " read -a line ; do
+    local idx=0 threadId pcpu
+    while read threadId pcpu ; do
         (( idx < count )) || break
 
-        local threadId="${line[0]}"
-        local pcpu="${line[1]}"
-
         # output field: pid, threadId, pcpu, user
         local output_fields="$( echo "$ps_out" |
             awk -v "threadId=$threadId" -v "pcpu=$pcpu" '$2==threadId {
@@ -379,14 +375,9 @@ findBusyJavaThreadsByTop() {
 }
 
 printStackOfThreads() {
-    local -a line
-    local idx=0
-    while IFS=" " read -a line ; do
-        local pid="${line[0]}"
-        local threadId="${line[1]}"
+    local idx=0 pid threadId pcpu user
+    while read pid threadId pcpu user ; do
         local threadId0x="0x`printf %x ${threadId}`"
-        local pcpu="${line[2]}"
-        local user="${line[3]}"
 
         (( idx++ ))
         local jstackFile="${store_file_prefix}$(( i + 1 ))_jstack_${pid}"