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how to delete the line if the first letter is a single digit

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# 1  
Old 02-04-2012
how to delete the line if the first letter is a single digit
Hi,
I'm trying to acheive the following, I have a dat file in which i have several addresses, If the address starts with a single digit then i have to delete the line,
if it starts with 2 or more digits then i have to keep the line

Here is a sample of my file:
Code:
377 CARRER DE LA DIPUTACIÓ	BARCELONA	CATALUNYA	08013	ESP	
77 GREEN STREET	HIGH WYCOMBE	BUCKINGHAMSHIRE	HP11 2	GBR
2 KREUZWEG	ERSIGEN	BERN	3423	CHE	
3 MUNCHPLATZ	10. BEZIRK-FAVORITEN	WIEN	1100	AUT

Here is what i want in my output file:
Code:
377 CARRER DE LA DIPUTACIÓ	BARCELONA	CATALUNYA	08013	ESP	
77 GREEN STREET	HIGH WYCOMBE	BUCKINGHAMSHIRE	HP11 2	GBR

I have tried the following regex:
sed -e /^[0-9]/d -- this is deleting all lines.
Last edited by Scott; 02-04-2012 at 03:35 PM.. Reason: Use code tags, please.
# 2  
Old 02-04-2012
Code:
awk '/^[0-9]/ && length($1)<2 {next} {print} ' inputfile

using awk.
This User Gave Thanks to jim mcnamara For This Post:
ramky79
# 3  
Old 02-04-2012
Code:
grep -E '^[0-9]{2}' infile

Code:
sed '/^[0-9][0-9]/!d' infile

Code:
awk '/^[0-9]{2}/' infile

whitespace proof:
Code:
awk '$1~/[0-9]{2}/' infile1039

# 4  
Old 02-04-2012
@ramky79: A little tweak to your attempt. Add space after [0-9] - "[0-9] ".
Code:
sed '/^[0-9] /d' inputfile

# 5  
Old 02-04-2012
Using grep...
Code:
grep -v "^[0-9] " infile

--ahamed
# 6  
Old 02-05-2012
Then use [ \t], since otherwise this will not work if the whitespace happens to be tab:
Code:
sed '/^[0-9][ \t]/d' inputfile

Code:
grep -v "^[0-9][ \t]" infile

Or to make it also tolerant to whitespace at the beginning - like the last awk example - use ^[ \t]*[0-9][ \t]
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