Merge pull request '10215501408马也驰' (#7) from 10215501408/Computer-Systems-Labs:master into master

Reviewed-on: https://gitea.shuishan.net.cn/52265903006/Computer-Systems-Labs/pulls/7

lab1/10215501408.txt

@@ -0,0 +1,87 @@
+#include "stdio.h"
+#include "stdlib.h"
+#include "time.h"
+#include "math.h"
+#include "string.h"
+
+/**
+ * @brief generate a file consists of 50000 lines of words, 
+ *        half line has a substring "computer", and is repeated.
+ *        the clone one is stripped of "computer".
+ *        
+ *        0 ~ 9 : 48 ~ 57
+ *        a ~ z : 97 ~ 122
+ * 
+ */
+
+
+void file_create(const char *_addr)
+{
+    FILE *file = fopen(_addr, "w");
+    size_t line = 250000u;
+    srand(time(NULL));
+
+    // char *str = NULL;
+    for (size_t i = 0; i < line; i++) {
+        // str = (char *)malloc(abs(rand())%20 * sizeof(char));
+        char str[abs(rand())%100+1];
+        for (size_t j = 0; j < strlen(str); j++) {
+            if (abs(rand()) % 2 == 0) 
+                str[j] = abs(rand())%10 + 48;
+            else
+                str[j] = abs(rand())%26 + 97;
+        }
+        strcat(str, "computer\n");
+        fputs(str, file);
+        fputs(str, file);
+        // free(str);
+    }   
+
+    fclose(file);
+}
+
+void file_show() 
+{
+    FILE *file = fopen("words.txt", "r");
+    int ch;
+
+    while ((ch = fgetc(file)) != '\n') {
+        printf("%c", ch);
+    }
+
+    fclose(file);
+}
+
+int main()
+{
+    file_create("words.txt");
+    return 0;
+}
+
+
+
+//shell code
+sort words.txt > opt1.txt
+uniq opt1.txt > uniq1.txt
+
+sort -n words.txt > opt2.txt
+uniq opt2.txt > uniq.txt
+
+cat uniq1.txt > override.txt
+cat uniq.txt > override.txt
+
+cat uniq1.txt >> cct.txt
+cat uniq.txt >> cct.txt
+
+grep -o "computer" words.txt > computer.txt
+
+grep -c "computer" words.txt
+
+
+git add 10215501408.txt
+
+git commit -m “myc”
+
+git push -u origin master
+
+