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How to retrieve digital string using sed or awk

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# 1  
Old 08-12-2010
How to retrieve digital string using sed or awk
Hi,

I have filename in the following format:

YUENLONG_20070818.DMP
HK_20070818_V0.DMP
WANCHAI_20070820.DMP
KWUNTONG_20070820_V0.DMP

How to retrieve only the digital part with sed or awk and return the following format:

20070818
20070818
20070820
20070820


Thanks!
Victor
# 2  
Old 08-12-2010
Assuming standard formatting:

Code:
#  echo "YUENLONG_20070818.DMP" | nawk -F"[_\.]" '{print $2}'
20070818

or if you know these are the only numerics, but position may be an issue:

Code:
#  echo "YUENLONG_20070818.DMP" | sed 's/[^0-9]//g'
20070818

HTH
This User Gave Thanks to Tytalus For This Post:
victorcheung
# 3  
Old 08-12-2010
Hi, Something like this.

Code:
ls filename | sed 's/[^0-9]//g'

# 4  
Old 08-12-2010
Code:
# sed 's/.*\([0-9]\{8\}\).*/\1/' infile
20070818
20070818
20070820
20070820

This User Gave Thanks to ygemici For This Post:
victorcheung
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