c_header: system()(linux; <stdlib.h>)

c_header:  system()(linux; <stdlib.h>)

一、源码

 1 [root@rocky c]# cat stdlib_header.c 
 2 #include<stdio.h>
 3 #include<stdlib.h>
 4 #include<string.h>
 5 
 6 #include<unistd.h>      // sleep()
 7 #include<time.h>        // time_t, time()
 8 
 9 
10 
11 void
12 msg1()
13 {
14    int size = 5;
15    char *cmd[] = {"pwd", "ls", "date", "uname -a", "cd ~; ls -l"};
16 
17   for(int i=0; i<size; i++)
18   {
19     printf("\n");
20     printf("\n\t== run_cmd_start: [ %s ]\t==\n", cmd[i]);
21       system(cmd[i]);
22     printf("\t-- run_cmd_end: [ %s ]\t--\n", cmd[i]);
23     printf("\n");
24   }
25 }
26 
27 
28 void
29 msg2(int size, char **cmd)
30 {
31 
32   for(int i=1; i<size; i++)
33   {
34     printf("\n");
35     printf("\n\t== run_cmd_start: [ %s ]\t==\n", cmd[i]);
36       system(cmd[i]);
37     printf("\t-- run_cmd_end: [ %s ]\t--\n", cmd[i]);
38     printf("\n");
39   }
40 }
41 
42 
43 void
44 msg3()
45 {
46   const int SIZE = 10;
47   time_t t;
48   int rand_dig = 0;
49   printf("\n\trand_max = %d\n\n", RAND_MAX);
50   for(int i=1; i<= SIZE; i++)
51   {
52     printf("\twait[ 2 ] seconds...\n");
53     sleep(2);
54     srand( (unsigned)time(&t) );
55     rand_dig = ( rand()%100 );
56     printf("\t\trand_number<rang:0~100>[time_%d] = %d\n", i, rand_dig );
57   }
58   printf("\n\n");
59 }
60 
61 
62 
63 
64 int
65 main(int argc, char *argv[], char *envp[])
66 {
67 
68   // msg1();
69   msg2(argc, argv);
70   // msg3();
71 
72 
73   return 0;
74 }
75 [root@rocky c]# 
76 [root@rocky c]# 

二、运行结果：

  1 [root@rocky c]# alias
  2 alias cp='cp -i'
  3 alias egrep='egrep --color=auto'
  4 alias fgrep='fgrep --color=auto'
  5 alias grep='grep --color=auto'
  6 alias l.='ls -d .* --color=auto'
  7 alias lcc='gcc -Wall -g -o'
  8 alias ll='ls -l --color=auto'
  9 alias ls='ls --color=auto'
 10 alias mv='mv -i'
 11 alias rm='rm -i'
 12 alias xzegrep='xzegrep --color=auto'
 13 alias xzfgrep='xzfgrep --color=auto'
 14 alias xzgrep='xzgrep --color=auto'
 15 alias zegrep='zegrep --color=auto'
 16 alias zfgrep='zfgrep --color=auto'
 17 alias zgrep='zgrep --color=auto'
 18 [root@rocky c]# 
 19 [root@rocky c]# 
 20 [root@rocky c]# cat stdlib_header.c 
 21 #include<stdio.h>
 22 #include<stdlib.h>
 23 #include<string.h>
 24 
 25 #include<unistd.h>      // sleep()
 26 #include<time.h>        // time_t, time()
 27 
 28 
 29 
 30 void
 31 msg1()
 32 {
 33    int size = 5;
 34    char *cmd[] = {"pwd", "ls", "date", "uname -a", "cd ~; ls -l"};
 35 
 36   for(int i=0; i<size; i++)
 37   {
 38     printf("\n");
 39     printf("\n\t== run_cmd_start: [ %s ]\t==\n", cmd[i]);
 40       system(cmd[i]);
 41     printf("\t-- run_cmd_end: [ %s ]\t--\n", cmd[i]);
 42     printf("\n");
 43   }
 44 }
 45 
 46 
 47 void
 48 msg2(int size, char **cmd)
 49 {
 50 
 51   for(int i=1; i<size; i++)
 52   {
 53     printf("\n");
 54     printf("\n\t== run_cmd_start: [ %s ]\t==\n", cmd[i]);
 55       system(cmd[i]);
 56     printf("\t-- run_cmd_end: [ %s ]\t--\n", cmd[i]);
 57     printf("\n");
 58   }
 59 }
 60 
 61 
 62 void
 63 msg3()
 64 {
 65   const int SIZE = 10;
 66   time_t t;
 67   int rand_dig = 0;
 68   printf("\n\trand_max = %d\n\n", RAND_MAX);
 69   for(int i=1; i<= SIZE; i++)
 70   {
 71     printf("\twait[ 2 ] seconds...\n");
 72     sleep(2);
 73     srand( (unsigned)time(&t) );
 74     rand_dig = ( rand()%100 );
 75     printf("\t\trand_number<rang:0~100>[time_%d] = %d\n", i, rand_dig );
 76   }
 77   printf("\n\n");
 78 }
 79 
 80 
 81 
 82 
 83 int
 84 main(int argc, char *argv[], char *envp[])
 85 {
 86 
 87   // msg1();
 88   msg2(argc, argv);
 89   // msg3();
 90 
 91 
 92   return 0;
 93 }
 94 [root@rocky c]# 
 95 [root@rocky c]# 
 96 [root@rocky c]# lcc stdlib_header stdlib_header.c && ./stdlib_header "pwd" "ls -l" "mkdir folder" "ls -l"
 97 
 98 
 99         == run_cmd_start: [ pwd ]       ==
100 /root/user/lidawei/tmp/c
101         -- run_cmd_end: [ pwd ] --
102 
103 
104 
105         == run_cmd_start: [ ls -l ]     ==
106 total 80
107 -rw-r--r-- 1 root root   625 Dec 28 03:11 arg_test.c
108 -rw-r--r-- 1 root root   900 Dec 31 01:04 asm_test.c
109 -rw-r--r-- 1 root root   539 Dec 29 01:25 char_test.c
110 -rw-r--r-- 1 root root    66 Jan  4 00:28 me_backup.txt
111 -rw-r--r-- 1 root root   107 Jan  4 01:16 me.txt
112 -rw-r--r-- 1 root root  2352 Dec 28 23:56 pointer_array.c
113 -rw-r--r-- 1 root root   490 Dec 29 17:09 preprocessor.c
114 -rw-r--r-- 1 root root   410 Jan  4 01:16 stdio_header.c
115 -rwxr-xr-x 1 root root 28736 Jan  5 01:00 stdlib_header
116 -rw-r--r-- 1 root root  1158 Jan  5 00:57 stdlib_header.c
117 -rw-r--r-- 1 root root   154 Jan  4 21:08 template.c
118 -rw-r--r-- 1 root root   536 Dec 29 18:34 thread_test.c
119 -rw-r--r-- 1 root root  1166 Jan  4 23:38 time_header.c
120         -- run_cmd_end: [ ls -l ]       --
121 
122 
123 
124         == run_cmd_start: [ mkdir folder ]      ==
125         -- run_cmd_end: [ mkdir folder ]        --
126 
127 
128 
129         == run_cmd_start: [ ls -l ]     ==
130 total 80
131 -rw-r--r-- 1 root root   625 Dec 28 03:11 arg_test.c
132 -rw-r--r-- 1 root root   900 Dec 31 01:04 asm_test.c
133 -rw-r--r-- 1 root root   539 Dec 29 01:25 char_test.c
134 drwxr-xr-x 2 root root     6 Jan  5 01:00 folder
135 -rw-r--r-- 1 root root    66 Jan  4 00:28 me_backup.txt
136 -rw-r--r-- 1 root root   107 Jan  4 01:16 me.txt
137 -rw-r--r-- 1 root root  2352 Dec 28 23:56 pointer_array.c
138 -rw-r--r-- 1 root root   490 Dec 29 17:09 preprocessor.c
139 -rw-r--r-- 1 root root   410 Jan  4 01:16 stdio_header.c
140 -rwxr-xr-x 1 root root 28736 Jan  5 01:00 stdlib_header
141 -rw-r--r-- 1 root root  1158 Jan  5 00:57 stdlib_header.c
142 -rw-r--r-- 1 root root   154 Jan  4 21:08 template.c
143 -rw-r--r-- 1 root root   536 Dec 29 18:34 thread_test.c
144 -rw-r--r-- 1 root root  1166 Jan  4 23:38 time_header.c
145         -- run_cmd_end: [ ls -l ]       --
146 
147 [root@rocky c]# 
148 [root@rocky c]# 
149 [root@rocky c]#