Making lots of wild assumptions about what operating system (and, therefore what type of shell is installed as sh, one might try something like the following:
Obviously, you should add a check to verify that an odd number of arguments were not given and you might want to add an output pathname as a parameter instead of always appending to the file named file_new, but this should get you started.
This User Gave Thanks to Don Cragun For This Post:
A good place to start is simple variable passing....
Passing variables from one script to another
The next level is passing a variable into a more complex command such as using a variable in a sed command. There are some simple quoting techniques that are very general. These are mentioned... (0 Replies)
I am having a shell script which has to be called from a C program. I have to pass two parameters to this script. HOw can I do that?
eg:
int main()
{
char st1;
char str2;
// call a shell script
call_sh(str1,str2) where call_sh is the name of the shell script.
then i need to get the return... (5 Replies)
hi,
i am passing around 14 parameters for a script
a=$1
b=$2
c=$3
d=$4
e=$5
f=$6
g=$7
h=$8
i=\"${9}\"
shift
j=\"${1}\"
still for j it is displaying the 1st parameter value..how to make it take the 10th parameter (2 Replies)
Hello,
I have two files that have delimited entries as shown below. I would like to use either Perl or Shell script to extract all the rows in File 1 corresponding to values in File 2 and output it to another File.
File 1
-------
1 36 24 Object1
2 45 36 Object2
3 96 ... (1 Reply)
Hi
I would like to use tar cmd in my script.
I have a variable with filenames, e.g. 1000 records and I would like to paste its values into tar cmd.
For this example I used three elements variable strings.
strings="file1.txt file2.txt file3.txt"
`tar cf file1.tar $strings`
Whether... (1 Reply)
Hello,
I have a shell script "Test.ksh" and I need to pass 8 parameters/arguments while executing the script
./Test.ksh 1 2 3 4 5 6 7 8
Out of these I want first 3 to be compulsory and rest 5 to be optional. Can you suggest the way to do this like and also how to pass these optional... (3 Replies)
I have an for loop that reads the following file
cat param.cfg
val1:env1:opt1
val2:env2:opt2
val3:env3:opt3
val4:env4:opt4
.
.
The for loop extracts the each line of the file so that at any one point, the value of i is
val1:env1:opt1 etc...
I would like to extract each... (19 Replies)
Hi Guru's,
I am new to shell scripting. I have a unique requirement:
The system generates a single pdf(/tmp/ABC.pdf) file with Invoices for Multiple Customers, the format is something like this:
Page1 >> Customer 1 >>Invoice1 + invoice 2 >> Page1 end
Page2 >> Customer 2 >>Invoice 3 + Invoice 4... (3 Replies)
Hello
I have a file like this:
> cat examplefile
ghi|NN603762|eee
mno|NN607265|ttt
pqr|NN613879|yyy
stu|NN615002|uuu
jkl|NN607265|rrr
vwx|NN615002|iii
yzA|NN618555|ooo
def|NN190486|www
BCD|NN628717|ppp
abc|NN190486|qqq
EFG|NN628717|aaa
HIJ|NN628717|sss
>
I can sort the file by... (5 Replies)
Hi,
Is there a special positional variables for when using the dot (.)?
Scripts are as below:
$: head -100 x.ksh /tmp/y.ksh
==> x.ksh <==
#!/bin/ksh
#
. /tmp/y.ksh 1234 abcd
echo "yvar1 = $yvar1"
echo "yvar2 = $yvar2"
==> /tmp/y.ksh <==
#!/bin/ksh (2 Replies)
Discussion started by: newbie_01
2 Replies
LEARN ABOUT CENTOS
varargs
varargs(3EXT) Extended Library Functions varargs(3EXT)NAME
varargs - handle variable argument list
SYNOPSIS
#include <varargs.h>
va_alist
va_dcl
va_list pvar;
void va_start(va_listpvar);
type va_arg(va_list pvar, type);
void va_end(va_list pvar);
DESCRIPTION
This set of macros allows portable procedures that accept variable argument lists to be written. Routines that have variable argument lists
(such as printf(3C)) but do not use varargs are inherently non-portable, as different machines use different argument-passing conventions.
va_alist is used as the parameter list in a function header.
va_dcl is a declaration for va_alist. No semicolon should follow va_dcl.
va_list is a type defined for the variable used to traverse the list.
va_start is called to initialize pvar to the beginning of the list.
va_arg will return the next argument in the list pointed to by pvar. type is the type the argument is expected to be. Different types can
be mixed, but it is up to the routine to know what type of argument is expected, as it cannot be determined at runtime.
va_end is used to clean up.
Multiple traversals, each bracketed by va_start and va_end, are possible.
EXAMPLES
Example 1: A sample program.
This example is a possible implementation of execl (see exec(2) ).
#include <unistd.h>
#include <varargs.h>
#define MAXARGS 100
/* execl is called by
execl(file, arg1, arg2, ..., (char *)0);
*/
execl(va_alist)
va_dcl
{
va_list ap;
char *file;
char *args[MAXARGS]; /* assumed big enough*/
int argno = 0;
va_start(ap);
file = va_arg(ap, char *);
while ((args[argno++] = va_arg(ap, char *)) != 0)
;
va_end(ap);
return execv(file, args);
}
SEE ALSO exec(2), printf(3C), vprintf(3C), stdarg(3EXT)NOTES
It is up to the calling routine to specify in some manner how many arguments there are, since it is not always possible to determine the
number of arguments from the stack frame. For example, execl is passed a zero pointer to signal the end of the list. printf can tell how
many arguments are there by the format.
It is non-portable to specify a second argument of char, short, or float to va_arg, since arguments seen by the called function are not
char, short, or float. C converts char and short arguments to int and converts float arguments to double before passing them to a function.
stdarg is the preferred interface.
SunOS 5.10 10 May 2002 varargs(3EXT)