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Shell Programming and Scripting

String operations

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# 1  
Old 07-13-2011
String operations
Hi All,

can you tell me how to drop all preceding zeros in a number. For example, if i have a numbers like 000876838347 and 0000007854762543..how to make them as 876838347 and 7854762543.
# 2  
Old 07-13-2011
What is your system? What is your shell?
# 3  
Old 07-13-2011
Code:
[mute@geek ~/test]$ echo 0000007854762543 | awk '{ print $1+0 }'
7854762543

[mute@geek ~/test]$ expr 0000007854762543 + 0
7854762543

bash $(())
Code:
[mute@geek ~/test]$ echo $((10#0000007854762543))
7854762543

This User Gave Thanks to neutronscott For This Post:
nram_krishna@ya
# 4  
Old 07-13-2011
Problem with numerical operations is most things assume numbers beginning in zero are octal.
This User Gave Thanks to Corona688 For This Post:
nram_krishna@ya
# 5  
Old 07-13-2011
Here is a solution without numerical operations:
Code:
echo '0000123040' | sed 's/^0*//'

This User Gave Thanks to Shell_Life For This Post:
nram_krishna@ya
# 6  
Old 07-14-2011
Thanks a bunch! its worked..
# 7  
Old 07-14-2011
If you have ksh93 then you can use builtin regexp
Code:
a=00005676570076585700
b=${a/~(E)^0*/}
echo $a
echo $b

Or
Code:
b=${a##+(0)}

Last edited by kshji; 07-14-2011 at 01:14 PM..
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