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# 1  
Old 02-27-2008
interesting problem


I am new in this forum and I am glad to be a part of it. I have a problem that has two parts:

1/ extract just the timestamp from a filename: for example, I have a file called 'sales20080226144525.txt' and I want to extract just the '20080226144525' part out of it.

2/ Now, take that timestamp and insert it in the beginning of each line with a '|' delimiter. For example,

%> cat test.txt
The cow jumped over the moon
The dish ran away with the spoon

%> cat test.txt
20080226144525|The cow jumped over the moon
20080226144525|The dish ran away with the spoon

# 2  
Old 02-27-2008
TIMESTAMP=`echo "sales20080226144525.txt" | sed "s/^[^0-9]*\([0-9]*\).*/\1/"`

sed -i "s/^/$TIMESTAMP|/" test.txt

For extracting the timestamp, you can use a simpler method, it all depends on the filename format. For example, for the given filename you can also use:

TIMESTAMP=`echo "sales20080226144525.txt" | sed "s/[^0-9]*//g"

# 3  
Old 02-27-2008
echo "sales20080226144525.txt" | sed 's/sales\(.*\)\..*$/\1/'

filename=`echo "sales20080226144525.txt" | sed 's/sales\(.*\)\..*$/\1/'`

sed 's/^/'$filename'|/' input > output

# 4  
Old 02-27-2008
Thanks Robotronic, it works... the power of sed.

# 5  
Old 02-29-2008
Just one comment - for me this is not "interesting problem". Next time try to use more accurate title, like "How to parse and modify a string".
Thanks and sorry for correcting you
# 6  
Old 02-29-2008
just one more way to do this.

 filename=`print "sales20080226144525.txt" | tr -d "A-z."`

agree with prior poster, please use proper title next time.

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Test Your Knowledge in Computers #928
Difficulty: Medium
64-bit versions of the Unix time stamp will cease to work at 15:30:08 UTC on Sunday, 14 December 2922770265960.
True or False?

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