diff --git a/codes/shell/action/oper/input.sh b/codes/shell/action/oper/input.sh
new file mode 100644
index 0000000..29ad918
--- /dev/null
+++ b/codes/shell/action/oper/input.sh
@@ -0,0 +1,25 @@
+#!/usr/bin/env bash
+
+##############################################################
+# 很多场景下，我们需要在执行脚本时，输入指定的参数，脚本会
+# 根据参数执行不同的行为。这就需要读取脚本参数并校验。
+##############################################################
+
+################### 读取脚本输入参数并校验 ###################
+declare -a serial
+serial=(start stop restart)
+echo -n "请选择操作（可选值：start|stop|restart）："
+read  oper
+if ! echo ${serial[@]} | grep -q ${oper}; then
+  echo "请选择正确操作（可选值：start|stop|restart）"
+  exit 1
+fi
+
+declare -a serial2
+serial2=(dev test prod)
+echo -n "请选择运行环境（可选值：dev|test|prod）："
+read  profile
+if ! echo ${serial2[@]} | grep -q ${profile}; then
+  echo "请选择正确运行环境（可选值：dev|test|prod）"
+  exit 1
+fi
diff --git a/codes/shell/action/system/dir.sh b/codes/shell/action/system/dir.sh
new file mode 100644
index 0000000..b9499d0
--- /dev/null
+++ b/codes/shell/action/system/dir.sh
@@ -0,0 +1,7 @@
+#!/usr/bin/env bash
+
+current_dir=$(cd `dirname $0`; pwd)
+echo "当前目录是：${current_dir}"
+
+parent_dir=$(dirname $(pwd))
+echo "父目录是：${parent_dir}"
diff --git a/codes/shell/demos/string-demo.sh b/codes/shell/demos/string-demo.sh
index 26bd6ae..652c57a 100644
--- a/codes/shell/demos/string-demo.sh
+++ b/codes/shell/demos/string-demo.sh
@@ -35,3 +35,20 @@ text="hello"
 echo `expr index "${text}" ll`
 # Output:
 # 3
+
+################### 截取关键字左边内容 ###################
+str="feature/1.0.0"
+branch=`echo ${str#feature/}`
+echo "branch is ${branch}"
+
+################### 截取关键字右边内容 ###################
+key=`echo ${str%/1.0.0}`
+echo "key is ${key}"
+
+################### 判断字符串中是否包含子字符串 ###################
+result=$(echo "${str}" | grep "feature/")
+if [[ "$result" != "" ]] ; then
+  echo "feature/ 是 ${str} 的子字符串"
+else
+  echo "feature/ 不是 ${str} 的子字符串"
+fi