hw1 from 10215501413

lab1/10215501413.sh

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+#!/bin/bash
+
+# 读取随机数据并转为 base64 编码
+head -n 50000 /dev/urandom | base64 > random;
+# 抽取 50000 行数据
+head -n 50000 random > random2;
+# rename
+rm random;
+mv random2 random;
+
+# 按 asc 排序
+sort --unique random > unique_sort_by_asc;
+# 按 num 排序
+sort --unique --numeric-sort random > unique_sort_by_num;
+
+# 追加写
+cat unique_sort_by_asc > totall;
+cat unique_sort_by_num >> totall;
+
+# 匹配并统计字符
+grep -o "com" totall | wc -l > number_of_com;