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Using BASH on windows

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Top Forums Shell Programming and Scripting Using BASH on windows
# 8  
Old 07-24-2013
[EDIT] I forgot to add the other stuff, such as what happens when I run my command line argument program. Here it is:

Quote:
t@The-Devver /cygdrive/c/Users/t/Desktop/MadExperiments
$ ./CommandParam.exe

No arguments found!
t@The-Devver /cygdrive/c/Users/t/Desktop/MadExperiments
$ ./CommandParam.exe These are arguments!

Filename: C:\Users\t\Desktop\MadExperiments\CommandParam.exe has 4 arguments.The arguments are:
Argument 0 is: (null)
Argument 1 is: (null)
Argument 2 is: (null)
Argument 3 is: (null)

t@The-Devver /cygdrive/c/Users/t/Desktop/MadExperiments
$ cat clineexperiment.c //CommandParam.exe is the name I gave my executable. clineexperiment is the name of the c file.
#include<stdio.h>

int main ( int argc, char *argv[] )
{

if ( argc > 1 ) {
printf( "Filename: %s has %d arguments.", argv[0], argc );
} else {
printf ("No arguments found!");
getchar();
return 0;
}


printf( "The arguments are: \n" );
for (long long int i = 0; i < argc; i++) {
printf( "Argument %d is: %s \n", i, argv[i] );
}


getchar();
return 0;
}


t@The-Devver /cygdrive/c/Users/t/Desktop/MadExperiments
$
OH yeah and I did not know the cygwin terminal was by default the bash terminal as well. So I was trying to use the bash application in place of the cygwin terminal. That may have been part of the problem. [/EDIT]

OK I've done all of that and here is what I got:
Quote:
t@The-Devver /cygdrive/c/Users/t/Desktop/madexperiments
$ ls
batchexample.bat CommandParam.exe hworld.exe test_foo.exe
char_array.c FunctionExperiment1 MadCExperiment test_function.c
char_array.exe Hallo.c NewlineToASCII.c test_function.exe
char_array2.c Hello.c.rtf NLToASCII.exe Text.rtf
char_array2.exe HelloWorld.c test.cpp
cLineExperiment.c HelloWorld.exe test.exe
CommandParam HelloWorld.o test_foo.c

t@The-Devver /cygdrive/c/Users/t/Desktop/madexperiments
$ cat cLineExperiment.c
#include<stdio.h>

int main ( int argc, char *argv[] )
{

if ( argc > 1 ) {
printf( "Filename: %s has %d arguments.", argv[0], argc );
} else {
printf ("No arguments found!");
getchar();
return 0;
}


printf( "The arguments are: \n" );
for (long long int i = 0; i < argc; i++) {
printf( "Argument %d is: %s \n", i, argv[i] );
}


getchar();
return 0;
}
t@The-Devver /cygdrive/c/Users/t/Desktop/madexperiments
$
The file I tried to run with bash is CommandParam.exe. All of these files were written in C. They were compiled using extra debugging options with GCC. Side note: GCC, some windows command prompt, and GDB are about the only command line experience I've had. Learning all of this was quite recent. I use this compiler and debugger because I've found they have much better debugging options than say MS Visual Studio Express (and they're free!). MS limits the debugging tools to certain compilers while leaving them out of the other packages.

Most of your guesses were correct. Entering cat just made the terminal echo whatever else I put in.
Last edited by Cambria; 07-24-2013 at 12:25 PM..
# 9  
Old 07-24-2013
Your shell could not find ls, et al, because they weren't installed. To repeat:
Quote:
Originally Posted by Corona688
Lesson #2: BASH is a shell. It excels at calling other programs but most things you use in it, like cp mv ls awk sed cut, are not built into it. (busybox is a huge exception here -- it DOES have all of these and hundreds more built in for your convenience.) Things you can expect to be builtins include echo, printf, and test.
If you want all these commands without having to install them, I suggest busybox again...


As for your program, you should not be using long long int unless you actually need a long long int. It is a 64-bit number -- printf %d expects a 32-bit one.

The %d reads the first 32-bits of your 64-bit number. The %s reads the other half as all-zeroes since it is all-zeroes, which becomes (NULL) when printed. The string itself never gets used.
Last edited by Corona688; 07-24-2013 at 01:00 PM..
This User Gave Thanks to Corona688 For This Post:
Cambria
# 10  
Old 07-24-2013
What would tell me my computer was messed up if I had installed cygwin to the wrong place on my drive? Because I got cygwin confused with MinGW, I installed cygwin to the C: drive, then my cygwin terminal on my desktop did not show the original icon that it had. Now the same command entered twice produces different results in cygwin BASH... is there any way to fix this?

I know it was a really stupid move to install it there. FYI I reinstalled cygwin to a folder on the C: drive which is called "cygwin" but the actual installation directory exists inside of that folder. I thought this would avoid the problem if it hadn't already happened. I didn't know where else to place it...
# 11  
Old 07-25-2013
Which command gives what different results? Always be specific! Please don't turn your thread into a game of 20 questions.

Removing then reinstalling everything in its proper locations may or may not fix the problem depending on what it is.
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