├── Makefile
├── README.md
└── shebang.c


/Makefile:
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1 | 
2 | shebang: shebang.c
3 | 	$(CC) -o $@ $<
4 | 


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/README.md:
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 1 | 
 2 | Sometimes `#!/usr/bin/env` isn't sufficient. What if you wanted this:
 3 | 
 4 |     #!/usr/bin/env jruby --1.9
 5 |     puts RUBY_VERSION
 6 | 
 7 | You'd get:
 8 | 
 9 |     /usr/bin/env: jruby --1.9: No such file or directory
10 | 
11 | That sucks. Use shebang instead.
12 | 
13 |     #!/usr/bin/shebang jruby --1.9
14 |     puts "Hello from #{RUBY_VERSION}"
15 | 
16 | Working output:
17 | 
18 |     Hello from 1.9.2
19 | 
20 | 


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/shebang.c:
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 1 | /* shebang helper.
 2 |  *
 3 |  * This tool lets you sanely execute things from the shebang line
 4 |  * at the top of a script.
 5 |  * 
 6 |  * Problem solved by this program:
 7 |  * This line won't work like you might expect:
 8 |  *   #!/usr/bin/env scriptname arg1 arg2 ...
 9 |  *
10 |  * When executed, this will run this:
11 |  *   /usr/bin/env "scriptname arg1 arg2 ..."
12 |  *
13 |  * The above is likely not what you wanted, you wanted:
14 |  *   /usr/bin/env "scriptname" "arg1" "arg2" ...
15 |  *
16 |  * If you use this program, it'll work as expected:
17 |  *   #!/usr/bin/shebang scriptname arg1 arg2
18 |  */
19 | 
20 | #include <stdio.h> /* for printf */
21 | #include <unistd.h> /* for execvp */
22 | #include <stdlib.h> /* for calloc */
23 | #include <string.h> /* for memcpy */
24 | 
25 | int main(int argc, char **argv) {
26 |   char *cmd;
27 |   char **newargv;
28 | 
29 |   newargv = calloc(argc + 3, sizeof(char *));
30 |   newargv[0] = "/bin/sh";
31 |   newargv[1] = "-c";
32 |   asprintf(&(newargv[2]), "%s \"$@\"", argv[1]);
33 |   memcpy(newargv + 3, argv + 1, (argc - 1) * sizeof(char *));
34 | 
35 |   //for (int i = 0; i < argc + 2; i ++) {
36 |     //printf("newargv[%d]: %s\n", i, newargv[i]);
37 |   //}
38 | 
39 |   execvp("/bin/sh", newargv);
40 |   return -1;
41 | }
42 | 


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