language and scripting

[Soumya Poddar]

yes
but using the function getopt itself

as using the getopt
for single argument we can get it using oparg

for the same thing using a list og arguments
can we get it using some standard syntax

plese reply sir

[Bill Hassell]

> ./a.out -f toto tata -c arg1 arg2 arg3 arg4 ... -z
> you want to get the list of -c args?

The shell is separating each space-delimited string as a separate item for getopt. To supply multiple arguments to a single option, keep the arguments together. I like to use commas (more readable) or use quotes:

./a.out -f toto,tata -c arg1,arg2,arg3,arg4 ... -z

or

./a.out -f "toto tata" -c "arg1 arg2 arg3 arg4" ... -z

[Soumya Poddar]

in that case is my program need to parse them
or these list of arguments will be passed to me through some standard external variable
like optagr


plese reply
sir

[Laurent Menase]

getopt stop to the first identified -x
now if optarg points to the first string after the identified option if there is a : in the description
optind points to the next arg

so to get a variable number of params you can do for instance:

char * v2;
char *allcparms[256];
int indexcparms=0;
......
case 'c':
allcparms[indexcparms++]=optarg;
while(v2=argv[optind])
{
if ( v2[0]=='-' ) break;
allcparms[indexcparms++]=v2;
optind++;
}
break;

so
./a.out -c 1 2 3 4 5 6 -f xx yy
will put 1 2 3 4 5 6 in allcparms[0..5]
./a.out -c 1 2 3 4 5 6
also
./a.out -c 1 2 3 4 5 6 -- xx yy
also

is it what you are trying to make?

[Laurent Menase]

in one of my previous answer I wrote:
if (optarg[0]=='-')
in fact it is if (argv[optind][0]=='-')

[Soumya Poddar]

yes

but here in that case i parse those arguments using my programs

but i am asking that is there any standard function is there like getopt using which
i get my varriable number of arguments using some standard varriable like optarg in getopt

plese reply sir

[Laurent Menase]

please give an example
I don't follow what you are trying to get and how?

are you trying to do it in script?

[Soumya Poddar]

like
in C

while((c=getopt(...,...,":abf:"))!=-1)
{
.....
.....
.....
}

now if my input is
./a.out -f Mandoc.doc
we can get it like

ifile=optagr

but if we want to give the input like
./a.out -f Mandoc.doc Relese.doc .....

then is there any standard function which will
give same oppurtunity access those argument list

like
arguments=optargarr;

where
arguments is declared like

char* arguments[];

and optagr declared as

extern char* optarg[];

i want to use it in simple C program

[James R. Ferguson]

Hi:

> but if we want to give the input like
./a.out -f Mandoc.doc Relese.doc .....

As Bill said, quote the argument and 'getopt()' will see it as one. I suspect that you come from Windows environments where spaces are common in filenames. Spaces (whitespace) in Unix separates arguments when the shell parses a command line/

Hence:

# ./a.out -f "Mandoc.doc Relese.doc"

...will leave you with *one* argument to the '-f' option.

Regards!

...JRF...

[Soumya Poddar]

ya
I am a fresher i am new in company and i am new in unix i came from windows enviourment

so hence
we have make our program in such a way that it can parse the arguments by it self

and there is no way to parse multiple arguments uning getopt() in c

ok sir thank you
for helping me
and shareing your knowladge with me

thank you