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How to convert string to integer using linux shell script or a linux command?

+2 votes
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How to convert string to integer using linux shell script or a linux command?
posted Nov 8, 2013 by Vikas Upadhyay

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+1 vote

I have some unique requirement, where I need to do something like this -
1. My script takes the argument as file name which is absolute filename.
2. I need to separate the filename and directory from this absolute file name for the further processing.

Any suggestions -

+2 votes

I am using below script to validate IPV6 address but this script also pass invalid IP such as empty string, name etc.

if [[ "$IPv6ADDR"=~"^:?([a-fA-F0-9]{1,4}(:|.)?){0,8}(:|::)?([a-fA-F0-9]{1,4}(:|.)?){0,8}$" ]]; then
  echo "valid ipv6 addr"
  break;
else
  echo "Invalid IP Address"
  break;
fi

Can someone identify what's wrong in the regex, Please?

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