use argument not option to set update delay/count

imitate vmstate style

Author: oldratlee

README.md

@@ -11,6 +11,11 @@
 
 有自己用的好的脚本 或是 平时常用但没有写成脚本的功能，欢迎提供（[提交Issue](https://github.com/oldratlee/useful-scripts/issues))和分享（[Fork后提交代码](https://github.com/oldratlee/useful-scripts/fork)）！ :sparkling_heart:
 
+PS：
+
+本仓库的脚本（如`Java`相关脚本）在阿里等公司（如随身云，见[`awesome-scripts`仓库](https://github.com/Suishenyun/awesome-scripts)说明）的线上生产环境部署使用。  
+如果你的公司有部署使用，欢迎使用通过[提交Issue](https://github.com/oldratlee/useful-scripts/issues)告知，方便互相交流反馈～ :cupid:
+
 :beginner: 快速下载&使用
 ----------------------
 

docs/java.md

@@ -61,9 +61,10 @@ show-busy-java-threads.sh -s <指定jstack命令的全路径>
 # 显式指定jstack命令的路径就反而显得更方便了
 
 show-busy-java-threads.sh -a <输出记录到的文件>
+# 记录到文件以方便回溯查看
 
-show-busy-java-threads.sh -t <重复执行的次数> -i <重复执行的间隔秒数>
-# 缺省执行一次；执行间隔缺省是3秒
+show-busy-java-threads.sh <重复执行的间隔秒数> [<重复执行的次数>]
+# 多次执行，类似vmstat行为
 
 ##############################
 # 注意：
@@ -74,20 +75,25 @@ sudo show-busy-java-threads.sh
 
 # 帮助信息
 $ show-busy-java-threads.sh -h
-Usage: show-busy-java-threads.sh [OPTION]...
+Usage: show-busy-java-threads.sh [OPTION]... [delay [count]]
 Find out the highest cpu consumed threads of java, and print the stack of these threads.
-Example: show-busy-java-threads.sh -c 10
+
+Example:
+  show-busy-java-threads.sh       # show busy java threads info
+  show-busy-java-threads.sh 1     # update every 1 seconds, (stop by eg: CTRL+C)
+  show-busy-java-threads.sh 3 10  # update every 3 seconds, update 10 times
 
 Options:
   -p, --pid <java pid>      find out the highest cpu consumed threads from the specifed java process,
                             default from all java process.
   -c, --count <num>         set the thread count to show, default is 5
   -a, --append-file <file>  specify the file to append output as log
-  -t, --repeat-times <num>  specify the show times, default just show 1 time
-  -i, --interval <secs>     seconds to wait between updates, default 3 seconds
   -s, --jstack-path <path>  specify the path of jstack command
   -F, --force               set jstack to force a thread dump(use jstack -F option)
   -h, --help                display this help and exit
+  delay                     the delay between updates in seconds.
+  count                     the number of updates.
+                            the usage of delay/count imitates vmstat
 ```
 
 ### 示例
@@ -131,7 +137,7 @@ $ show-busy-java-threads.sh
 
 多执行几次`show-busy-java-threads.sh`，如果上面情况高概率出现，则可以确定上面的判定。  
 \# 因为调用越少代码执行越快，则出现在线程栈的概率就越低。  
-\# 脚本有自动多次执行的功能，`-t`选项，详见使用文档。
+\# 脚本有自动多次执行的功能，指定 重复执行的间隔秒数/重复执行的次数 参数。
 
 分析`shared.monitor.schedule.AppMonitorDataAvgScheduler.run`实现逻辑和调用方式，以优化实现解决问题。
 
@@ -141,6 +147,8 @@ $ show-busy-java-threads.sh
 - [liuyangc3](https://github.com/liuyangc3)
     - 发现并解决`jstack`非当前用户`Java`进程的问题。 [#50](https://github.com/oldratlee/useful-scripts/pull/50)
     - 优化性能，通过`read -a`简化反复的`awk`操作。 [#51](https://github.com/oldratlee/useful-scripts/pull/51)
+- [superhj1987](https://github.com/superhj1987) / [lirenzuo](https://github.com/lirenzuo)
+    - 提供/实现多次执行的功能 [superhj1987/awesome-scripts#1](https://github.com/superhj1987/awesome-scripts/issues/1)
 
 :beer: [show-duplicate-java-classes](../show-duplicate-java-classes)
 ----------------------

show-busy-java-threads.sh

@@ -6,6 +6,7 @@
 #   $ ./show-busy-java-threads.sh
 #
 # @author Jerry Lee
+# @author superhj1987
 
 readonly PROG=`basename $0`
 readonly -a COMMAND_LINE=("$0" "$@")
@@ -15,26 +16,31 @@ usage() {
     [ -n "$1" -a "$1" != 0 ] && out=/dev/stderr || out=/dev/stdout
 
     > $out cat <<EOF
-Usage: ${PROG} [OPTION]...
+Usage: ${PROG} [OPTION]... [delay [count]]
 Find out the highest cpu consumed threads of java, and print the stack of these threads.
-Example: ${PROG} -c 10
+
+Example:
+  ${PROG}       # show busy java threads info
+  ${PROG} 1     # update every 1 seconds, (stop by eg: CTRL+C)
+  ${PROG} 3 10  # update every 3 seconds, update 10 times
 
 Options:
   -p, --pid <java pid>      find out the highest cpu consumed threads from the specifed java process,
                             default from all java process.
   -c, --count <num>         set the thread count to show, default is 5
   -a, --append-file <file>  specify the file to append output as log
-  -t, --repeat-times <num>  specify the show times, default just show 1 time
-  -i, --interval <secs>     seconds to wait between updates, default 3 seconds
   -s, --jstack-path <path>  specify the path of jstack command
   -F, --force               set jstack to force a thread dump(use jstack -F option)
   -h, --help                display this help and exit
+  delay                     the delay between updates in seconds.
+  count                     the number of updates.
+                            the usage of delay/count imitates vmstat
 EOF
 
     exit $1
 }
 
-readonly ARGS=`getopt -n "$PROG" -a -o p:c:a:t:i:s:Fh -l count:,pid:,append-file:,repeat-times:,interval:,jstack-path:,force,help -- "$@"`
+readonly ARGS=`getopt -n "$PROG" -a -o p:c:a:s:Fh -l count:,pid:,append-file:,jstack-path:,force,help -- "$@"`
 [ $? -ne 0 ] && usage 1
 eval set -- "${ARGS}"
 
@@ -52,14 +58,6 @@ while true; do
         append_file="$2"
         shift 2
         ;;
-    -t|--repeat-times)
-        repeat_times="$2"
-        shift 2
-        ;;
-    -i|--interval)
-        interval="$2"
-        shift 2
-        ;;
     -s|--jstack-path)
         jstack_path="$2"
         shift 2
@@ -78,8 +76,10 @@ while true; do
     esac
 done
 count=${count:-5}
-repeat_times=${repeat_times:-1}
-interval=${interval:-3}
+
+update_delay=${1:-0}
+[ -z "$1" ] && update_count=1 || update_count=${2:-0}
+[ $update_count -lt 0 ] && update_count=0
 
 colorPrint() {
     local color=$1
@@ -120,11 +120,13 @@ normalPrint() {
 
 if [ -n "$jstack_path" ]; then
     ! [ -x "$jstack_path" ] && {
-        redPrint "Error: $jstack_path is NOT executalbe!" 1>&2
+        redPrint "Error: $jstack_path is NOT found/executalbe!" 1>&2
         exit 1
     }
-# Check the existence of jstack command!
-elif ! which jstack &> /dev/null; then
+elif which jstack &> /dev/null; then
+    # Check the existence of jstack command!
+    jstack_path="`which jstack`"
+else
     [ -z "$JAVA_HOME" ] && {
         redPrint "Error: jstack not found on PATH!" 1>&2
         exit 1
@@ -185,19 +187,19 @@ printStackOfThreads() {
     done
 }
 
-
 head_info() {
     echo ================================================================================
-    echo "$(date "+%Y-%m-%d %H:%M:%S.%N"): ${COMMAND_LINE[@]}"
+    echo "$(date "+%Y-%m-%d %H:%M:%S.%N") [$((i+1))/$update_count]: ${COMMAND_LINE[@]}"
     echo ================================================================================
     echo
 }
 
-for ((i = 0; i < repeat_times; ++i)); do
-    [ "$i" -gt 0 ] && sleep "$interval"
+# if update_count <= 0, infinite loop till user interupted (eg: CTRL+C)
+for ((i = 0; update_count <= 0 || i < update_count; ++i)); do
+    [ "$i" -gt 0 ] && sleep "$update_delay"
 
     [ -n "$append_file" ] && head_info >> "$append_file"
-    [ "$repeat_times" -gt 1 ] && head_info
+    [ "$update_count" -ne 1 ] && head_info
 
     ps -Leo pid,lwp,user,comm,pcpu --no-headers | {
         [ -z "${pid}" ] &&