Hexadecimal conversion

[Sanjay Tailor]

Hello,

I am trying to write a shell script. Is there a command ( utility ) that I can put that will take a number ( base ten ) and convery it to a hexadecimal number and also the other way around?

Also, is there a way to read a certain directory and copy certain files into another directory?

Thank you for your help,
Sanjay

[Peggy Fong]

I got this from a friend hope it helps you:

I have a c program I wrote to convert number between octal, hex and decimal. Maybe you'll find it handy. Save it to convert.c than do "cc convert.c -o convert. Than you can run it by just typing convert. I've included an example. Hope this helps.

main()
{
/* Declare variables */
int number ;
char ibase ;

printf ("Enter base of input number (h)ex, (d)ec, (o)ctal - ") ;
scanf ("%c", &ibase) ;

switch ( ibase )
{
case 'h' :
printf ("Enter the HEX number - ");
scanf ("%x", &number ) ;
printf ("Decimal = %d\nOctal = %o\n", number, number );
break ;

case 'd' :
printf ("Enter the DECIMAL number - ");
scanf ("%d", &number ) ;
printf ("Hex = %x\nOctal = %o\n", number, number );
break ;

case 'o' :
printf ("Enter the OCTAL number - ");
scanf ("%o", &number ) ;
printf ("Decimal = %d\nHex = %x\n", number, number );
break ;

}

}

Run "convert"
$ convert
Enter base of input number (h)ex, (d)ec, (o)ctal - h
Enter the HEX number - 20
Decimal = 32
Octal = 40

As for your second question there are many way to copy files from one directory to another
You can use find | cpio -pdm But read up on find in the "man" pages for this... I'm sure others can give you examples as well.

Peggy

[Bill Hassell]

For scripting, use bc (it accepts commands as stdin) or xd.

Since you mentioned 'certain' files in 'certain' directories, a standard cp command, perhaps with -p option to retain the original timestamps and permissions. cd to the source directory and use regular expressions to define 'certain' files.

[A. Clay Stephenson · Accepted solution]

Hi Senjay,

Peggy has given you a c method but there is a way to do it from the shell using the 'bc' binary calculator command. Try This:

#! /usr/bin/sh

# ------------------ Hex to Decimal Converter

while [ $# -ge 1 ]
do
INPUT=$1
shift
echo "obase=10;ibase=16;${INPUT};quit" | bc
done

#! /usr/bin/sh

# ------------------ Decimal to Hex Converter

while [ $# -ge 1 ]
do
INPUT=$1
shift
echo "obase=16;ibase=10;${INPUT};quit" | bc
done

Each of these takes any number of input arguments and converts them to the other radix one per line.

Regards, Clay

[James R. Ferguson]

Hi Sanjay:

Another way:

# printf "%#d\n" 0xf

# printf "%#x\n" 15

...JRF...

[Manikanda]

Hi,

Is there any Tandem SQL or TAL procedures or Cobol snippets to convert a decimal Number to Hexadecimal String.. There are easy steps available in C however we would like to have it in Tandem SQL or TAL or COBOL... Thanks ins advance..

Regards,

Manikanda

[Dennis Handly]

You can also use the shell builtin typeset to convert:

typeset -i16 x=256; echo "$x (256 in hex)"

typeset -i10 y=16#100; echo "$y (0x100 in decimal)"