Question

How to convert all numbers in Bash/shell?

VAR=00005
VAR=00010
VAR=00601
VAR=00550

to

echo $VAR #5
echo $VAR #10
echo $VAR #601
echo $VAR #550

Answer 1

or like this:

kent$  echo "00005
00010
00601
00550"|awk '$0*=1'
5
10
601
550

for your updated question (with VAR)

first of all, you should have different variable names, not all same as VAR.

see the example below:

kent$  VAR=00601

kent$  VAR=$((VAR+0))

kent$  echo $VAR
601

EDIT

for the comment.(08, 09 didn’t work):

08, 09 worked here, might be something with my shell to do. I have zsh. I tested followings under bash, they worked. hope helps:

under zsh:

kent$  v=08

kent$  v=$((v+0))

kent$  echo $v
8

under bash, below worked

kent@7PLaptop:/tmp$ bash -version
GNU bash, version 3.2.48(1)-release (i486-pc-linux-gnu)
Copyright (C) 2007 Free Software Foundation, Inc.
kent@7PLaptop:/tmp$ v=08
kent@7PLaptop:/tmp$ v=$(sed 's/^0*//'<<< $v)
kent@7PLaptop:/tmp$ echo $v
8