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addition with exact format

 
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# 1  
Old 04-21-2010
addition with exact format
Hi,
I need to add two numbers with prefix with some zero, And result should come with the prefix and numbers.
Code:
$a=00000054
$b=`expr  $a + 4 `
$echo $b  # 00000058 <-- Result

How can i get the result with prefix with zero's.
Thanks
Posix
# 2  
Old 04-21-2010
It depends on the shell you're using,
with all shells you could use printf:

Code:
% a=00000054 b="$(($a + 4))"
% printf '%08d\n' "$b"
00000058

With some shells you could define a variable zero padded,
this is ksh93:

Code:
$ typeset -Z8 a b
$ a=00000054 b="$((a + 4))"
$ print $b
00000058

Last edited by radoulov; 04-21-2010 at 02:19 PM..
# 3  
Old 04-21-2010
[QUOTE=radoulov;302414932]It depends on the shell you're using,
with all shell you could use printf:
Code:
% a=00000054 b="$(($a + 4))"
% printf '%08d\n' "$b"
00000058

Strange Out put
Code:
[root@xx]# echo $SHELL
/bin/bash
[root@xx]# a=00000054 b="$(($a + 4))"
[root@xx]# printf '%08d\n' "$b"
00000048

Can't we do zero padding like ksh in bash.
# 4  
Old 04-21-2010
Quote:
Originally Posted by posix
[...]
Strange Out put
Code:
[root@xx]# echo $SHELL
/bin/bash
[root@xx]# a=00000054 b="$(($a + 4))"
[root@xx]# printf '%08d\n' "$b"
00000048

Can't we do zero padding like ksh in bash.
Yes,
your shell is interpreting the number with leading 0's as octal.
Could you please post the output from the following command:

Code:
ps -p$$

P.S. $SHELL contains your login shell, not your current shell.
# 5  
Old 04-22-2010
Hi..out put of command ps -p$$
Code:
[root@xx]# ps -p$$
  PID TTY          TIME CMD
27035 pts/0    00:00:00 bash

# 6  
Old 04-22-2010
OK,
with bash you can force decimal interpretation:

Code:
$ a=00000054 b="$((10#$a + 4))"
$ printf '%08d\n' "$b"

# 7  
Old 04-23-2010
Thanks very much Radoulov. i got to know lots of things about the padding and printf functionality..
 
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