diff --git a/c b/c
index e17d1c55..39f292b8 100755
--- a/c
+++ b/c
@@ -17,6 +17,8 @@ readonly PROG="`basename "$0"`"
 usage() {
     [ -n "$1" -a "$1" != 0 ] && local out=/dev/stderr || local out=/dev/stdout
 
+    [ $# -gt 1 ] && { echo "$2"; echo; } > $out
+
     > $out cat <<EOF
 Usage: ${PROG} [OPTION]... [command [command_args ...]]
 Run command and put output to system clipper.
@@ -62,9 +64,7 @@ while [ $# -gt 0 ]; do
         break
         ;;
     -*)
-        echo "${PROG}: unrecognized option '$1'" 1>&2
-        echo 1>&2
-        usage 2;
+        usage 2 "${PROG}: unrecognized option '$1'"
         ;;
     *)
         # if not option, treat all follow args as command
@@ -97,5 +97,8 @@ teeAndCopy() {
     ) > $out
 }
 
-[ ${#args[@]} -eq 0 ] && teeAndCopy ||
-                "${args[@]}" | teeAndCopy
+if [ ${#args[@]} -eq 0 ]; then
+    teeAndCopy
+else
+    "${args[@]}" | teeAndCopy
+fi
diff --git a/docs/java.md b/docs/java.md
index 5b43fa6f..10581e49 100644
--- a/docs/java.md
+++ b/docs/java.md
@@ -32,7 +32,7 @@
 用于快速排查`Java`的`CPU`性能问题(`top us`值过高)，自动查出运行的`Java`进程中消耗`CPU`多的线程，并打印出其线程栈，从而确定导致性能问题的方法调用。  
 目前只支持`Linux`。原因是`Mac`、`Windows`的`ps`命令不支持列出线程线程，更多信息参见[#33](https://github.com/oldratlee/useful-scripts/issues/33)，欢迎提供解法。
 
-PS，如何操作可以参见[@bluedavy](http://weibo.com/bluedavy)的[《分布式Java应用》](https://book.douban.com/subject/4848587/)的【5.1.1 cpu消耗分析】一节，说得很详细：
+PS，如何操作可以参见[@bluedavy](http://weibo.com/bluedavy)的[《分布式Java应用》](https://book.douban.com/subject/4848587/)的【5.1.1 `CPU`消耗分析】一节，说得很详细：
 
 1. `top`命令找出有问题`Java`进程及线程`id`：
     1. 开启线程显示模式（`top -H`，或是打开`top`后按`H`）
@@ -340,17 +340,27 @@ class paths to find:
 find-in-jars 'log4j\.properties'
 find-in-jars 'log4j\.xml$'
 find-in-jars log4j\\.xml$ # 和上面命令一样，Shell转义的不同写法而已
-find-in-jars 'log4j(\.properties|\.xml)$'
+find-in-jars 'log4j\.(properties|xml)$'
 
 # -d选项 指定 查找目录（覆盖缺省的当前目录）
 find-in-jars 'log4j\.properties$' -d /path/to/find/directory
-# 支持多个查找目录
+# 支持多个查找目录，多次指定这个选项即可
 find-in-jars 'log4j\.properties' -d /path/to/find/directory1 -d /path/to/find/directory2
 
+# -e选项 指定 查找`zip`文件的扩展名，缺省是`jar`
+find-in-jars 'log4j\.properties' -e zip
+# 支持多种查找扩展名，多次指定这个选项即可
+find-in-jars 'log4j\.properties' -e jar -e zip
+
 # -a选项 指定 查找结果中的Jar文件使用绝对路径
 # 分享给别人时，Jar文件路径是完整的，方便别人找到文件
 find-in-jars 'log4j\.properties' -a
 
+# -s选项 指定 查找结果中的Jar文件和Jar文件里的查找Entry间分隔符，缺省是『!』
+# 方便你喜欢的人眼查看，或是与工具脚本如`awk`的处理
+find-in-jars 'log4j\.properties' -s ' <-> '
+find-in-jars 'log4j\.properties' -s ' ' | awk '{print $2}'
+
 # 帮助信息
 $ find-in-jars -h
 Usage: find-in-jars [OPTION]... PATTERN
@@ -358,20 +368,29 @@ Find file in the jar files under specified directory(recursive, include subdirec
 The pattern default is *extended* regex.
 
 Example:
-    find-in-jars 'log4j\.properties'
-    find-in-jars '^log4j(\.properties|\.xml)$' # search file log4j.properties/log4j.xml at zip root
-    find-in-jars 'log4j\.properties$' -d /path/to/find/directory
-    find-in-jars 'log4j\.properties' -d /path/to/find/dir1 -d /path/to/find/dir2
-
-Options:
+  find-in-jars 'log4j\.properties'
+  find-in-jars '^log4j\.(properties|xml)$' # search file log4j.properties/log4j.xml at zip root
+  find-in-jars 'log4j\.properties$' -d /path/to/find/directory
+  find-in-jars 'log4j\.properties' -d /path/to/find/dir1 -d path/to/find/dir2
+  find-in-jars 'log4j\.properties' -e jar -e zip
+  find-in-jars 'log4j\.properties' -s ' <-> '
+
+Find control:
   -d, --dir              the directory that find jar files, default is current directory.
                          this option can specify multiply times to find in multiply directories.
+  -e, --extension        set find file extension, default is jar.
+                         this option can specify multiply times to find in multiply extension.
   -E, --extended-regexp  PATTERN is an extended regular expression (*default*)
   -F, --fixed-strings    PATTERN is a set of newline-separated strings
   -G, --basic-regexp     PATTERN is a basic regular expression
   -P, --perl-regexp      PATTERN is a Perl regular expression
   -i, --ignore-case      ignore case distinctions
+
+Output control:
   -a, --absolute-path    always print absolute path of jar file
+  -s, --seperator        seperator for jar file and file entry, default is `!'.
+
+Miscellaneous:
   -h, --help             display this help and exit
 ```
 
diff --git a/find-in-jars b/find-in-jars
index 374117e4..400450f8 100755
--- a/find-in-jars
+++ b/find-in-jars
@@ -16,6 +16,8 @@ readonly PROG="`basename "$0"`"
 usage() {
     [ -n "$1" -a "$1" != 0 ] && local out=/dev/stderr || local out=/dev/stdout
 
+    [ $# -gt 1 ] && { echo "$2"; echo; } > $out
+
     > $out cat <<EOF
 Usage: ${PROG} [OPTION]... PATTERN
 Find file in the jar files under specified directory(recursive, include subdirectory).
@@ -23,19 +25,28 @@ The pattern default is *extended* regex.
 
 Example:
   ${PROG} 'log4j\.properties'
-  ${PROG} '^log4j(\.properties|\.xml)$' # search file log4j.properties/log4j.xml at zip root
+  ${PROG} '^log4j\.(properties|xml)$' # search file log4j.properties/log4j.xml at zip root
   ${PROG} 'log4j\.properties$' -d /path/to/find/directory
-  ${PROG} 'log4j\.properties' -d /path/to/find/dir1 -d /path/to/find/dir2
+  ${PROG} 'log4j\.properties' -d /path/to/find/dir1 -d path/to/find/dir2
+  ${PROG} 'log4j\.properties' -e jar -e zip
+  ${PROG} 'log4j\.properties' -s ' <-> '
 
-Options:
+Find control:
   -d, --dir              the directory that find jar files, default is current directory.
                          this option can specify multiply times to find in multiply directories.
+  -e, --extension        set find file extension, default is jar.
+                         this option can specify multiply times to find in multiply extension.
   -E, --extended-regexp  PATTERN is an extended regular expression (*default*)
   -F, --fixed-strings    PATTERN is a set of newline-separated strings
   -G, --basic-regexp     PATTERN is a basic regular expression
   -P, --perl-regexp      PATTERN is a Perl regular expression
   -i, --ignore-case      ignore case distinctions
+
+Output control:
   -a, --absolute-path    always print absolute path of jar file
+  -s, --seperator        seperator for jar file and file entry, default is \`!'.
+
+Miscellaneous:
   -h, --help             display this help and exit
 EOF
 
@@ -56,6 +67,14 @@ while [ $# -gt 0 ]; do
         dirs=("${dirs[@]}" "$2")
         shift 2
         ;;
+    -e|--extension)
+        extension=("${extension[@]}" "$2")
+        shift 2
+        ;;
+    -s|--seperator)
+        seperator="$2"
+        shift 2
+        ;;
     -E|--extended-regexp)
         regex_mode=-E
         shift
@@ -89,9 +108,7 @@ while [ $# -gt 0 ]; do
         break
         ;;
     -*)
-        echo "${PROG}: unrecognized option '$1'" 1>&2
-        echo 1>&2
-        usage 2;
+        usage 2 "${PROG}: unrecognized option '$1'"
         ;;
     *)
         args=("${args[@]}" "$1")
@@ -100,9 +117,11 @@ while [ $# -gt 0 ]; do
     esac
 done
 dirs=${dirs:-.}
+extension=${extension:-jar}
+seperator="${seperator:-!}"
 
-[ "${#args[@]}" -eq 0 ] && { echo "No find file pattern!" 1>&2 ; usage 1; }
-[ "${#args[@]}" -gt 1 ] && { echo "More than 1 file pattern!" 1>&2 ; usage 1; }
+[ "${#args[@]}" -eq 0 ] && usage 1 "No find file pattern!"
+[ "${#args[@]}" -gt 1 ] && usage 1 "More than 1 file pattern!"
 readonly pattern="${args[0]}"
 
 # convert dirs to Absolute Path.
@@ -116,6 +135,14 @@ $use_absolute_path && {
     dirs=( "${tmp_dirs[@]}" )
 }
 
+# convert to find -iname options
+for e in "${extension[@]}"; do
+    [ 0 -eq "${#find_iname_options[@]}" ] &&
+        find_iname_options=( -iname "*.$e" ) ||
+        find_iname_options=( "${find_iname_options[@]}" -o -iname "*.$e" )
+done
+
+
 ################################################################################
 # Check the existence of command for listing zip entry!
 ################################################################################
@@ -188,7 +215,7 @@ clearResponsiveMessage() {
 # find logic
 ################################################################################
 
-readonly jar_files="$(find "${dirs[@]}" -iname '*.jar' -type f)"
+readonly jar_files="$(find "${dirs[@]}" "${find_iname_options[@]}" -type f)"
 readonly total_count="$(echo "$jar_files" | wc -l)"
 [ -z "$jar_files" ] && {
     echo "No jar found!" 1>&2
@@ -207,8 +234,8 @@ while read jar_file; do
             clearResponsiveMessage
 
             $is_console &&
-                echo "$ec[1;31m${jar_file}$eend$ec[1;32m"\!"$eend${file}" ||
-                echo "${jar_file}"\!"${file}"
+                echo "$ec[1;31m${jar_file}${eend}${ec}[1;32m${seperator}${eend}${file}" ||
+                echo "${jar_file}${seperator}${file}"
         done
 
     clearResponsiveMessage