Organize files into categorized directories

Renamed and moved files into categorized directories for better organization. Categories include Shell-Programming, File-IO, Process-Control, and Signal-and-Piping.

1_Shell-Programming/count_files.sh

@@ -0,0 +1,11 @@
+#!/bin/bash
+# 统计当前目录下的文件总数
+file_count=$(ls | wc -l)
+# 统计当前目录下的子目录数
+dir_count=$(ls -l | grep '^d' | wc -l)
+# 统计当前目录下有执行权限的普通文件数
+exec_file_count=$(ls -l | grep '^-..x' | wc -l)
+# 输出结果
+echo "当前目录下的文件总数: $file_count"
+echo "当前目录下的子目录数: $dir_count"
+echo "当前目录下有执行权限的普通文件数: $exec_file_count"