On 21/01/2019 18:50, Adam Carter wrote: > I need to clean up a file which has IP addresses with leading zeros in > some of the octets so I need to make, say, .09 into .9 > > How do i do that in sed/awk/whatever?
A regex would be difficult. Parser is what you want. You could use Python's ipaddress module (Python 3.3+). It will fix your IPs (below is all one line): python -c $'import ipaddress, sys;\nfor x in sys.argv[1:]: print(ipaddress.ip_address(x))' 1.02.3.4 001.002.003.004 Output: 1.2.3.4 1.2.3.4 Fix that for stdin: python -c $'import ipaddress, sys;\nfor x in sys.stdin.readlines(): print(ipaddress.ip_address(x.strip()))' <<< $'1.02.3.4\n001.002.003.004' That way you can do: python -c $'import ipaddress, sys;\nfor x in sys.stdin.readlines(): print(ipaddress.ip_address(x.strip()))' < list-of-ip-addresses I'm sure there's a nicer way with modules installed with other languages but this is built into Python as of version 3.3. Andrew
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