BASH arrays and variables of variables in C++


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# 8  
Apart from changing lines 4 and 10 to "#!/bin/bash --posix" and cleaning up a bit, including removal of cout...
Code:
// Notice ! and --posix added to lines 4 AND 10
// Also cleaned it up a bit...
#define SHELLSCRIPT1 "\
#!/bin/bash --posix\n \
echo \"hello\"\n \
"

// Not working
#define test1 "\
#!/bin/bash --posix\n \
array=(a1 a2 a3)\n \
echo ${array[*]}\n \
"

#include <iostream>
#include <cstdlib>
using namespace std;
int main ()
{
// working cout removed
system(SHELLSCRIPT1);

// works on macbook pro cout removed
system(test1);

return 0;
}

Results...
Code:
Last login: Sun Dec  1 19:44:37 on ttys000
AMIGA:barrywalker~> g++ test.cpp
AMIGA:barrywalker~> ./a.out
hello
a1 a2 a3
AMIGA:barrywalker~> _

EDIT:
BTW cout removed because of RCs of 0 being printed to the window...

Last edited by wisecracker; 12-01-2013 at 04:11 PM.. Reason: See above...
# 9  
Code:
mute@thedoctor:~/temp/frad$ ./makecode < script > code.cpp
mute@thedoctor:~/temp/frad$ g++ code.cpp
mute@thedoctor:~/temp/frad$ ./a.out
VAR0 = good
VAR1 = excellent
mute@thedoctor:~/temp/frad$ cat makecode
#!/bin/sh

cat << '__EOF__'
#include <iostream>
#include <cstdlib>
#include <unistd.h>
using namespace std;

#define SHELL "/bin/bash"

const char shellcode[] = {
"\
__EOF__

sed -e 's/"/\\"/g' -e 's/$/\\n\\/'

cat << '__EOF__'
"
};

int main() {
        return execl(SHELL, SHELL, "-c", shellcode, NULL);
}
__EOF__

# 10  
The shebang, #!/bin/bash ... is irrelevant; the system(3) library function will use /bin/sh. The OP's /bin/sh does not support the necessary features (arrays, indirect vars).

Regards,
Alister
These 3 Users Gave Thanks to alister For This Post:
# 11  
The solution with
Code:
"$"

works as a dream. It is not which command is used, just
Code:
\$

is not accepted
The parenthesis used in a array declaration remain a problem. Should they be quoted, unquoted, backslashed?

---------- Post updated at 06:06 AM ---------- Previous update was at 05:38 AM ----------

Is there a work around the array issue? I need an 1d array. The only alternative are variable of variables , which work (the problem solved in this forum by wisecracker)

---------- Post updated at 06:32 AM ---------- Previous update was at 06:06 AM ----------

on ubuntu with g++ it does not work. If it works on Mac OS X perhaps is a matter of compiler. If yes is there a suitable c++ compiler on linux?
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