Extract number part from the string in ksh 88

Shell Programming and Scripting
1

I have to extract number part (Date and timestamp part ) from the following 3 strings

AB_XYZA_20130930183017.log
AB_DY_XYZA_20130930183017.log
AB_GZU_20130930183017.log

Output should be

20130930183017

Please help me to get the string like above
Thanks

2

With grep:

grep -o [0-9]* inputfile

awk:

awk -F'[_.]' '{print $(NF-1)}' inputfile
3

You may try this also...

$ cat <<EOF | awk '{gsub(/[A-Za-z._]/,x,$0);1}1'
AB_XYZA_20130930183017.log
AB_DY_XYZA_20130930183017.log
AB_GZU_20130930183017.log
EOF

20130930183017
20130930183017
20130930183017

$ cat <<EOF | sed 's/[A-Za-z._]//g'             
AB_XYZA_20130930183017.log
AB_DY_XYZA_20130930183017.log
AB_GZU_20130930183017.log
EOF

20130930183017
20130930183017
20130930183017
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