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Shell Programming and Scripting

String manipulation

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# 1  
Old 11-13-2007
Java String manipulation
Hi There!

I have the following block of text in my input file

Quote:
10,9:12/123456789
,10:1
11,10:60
15,9:5/12345
,10:1
,14:1001
17,9:12/123456789
,10:1
,11:1

and in order to parse it correctly, i need to have

Quote:
10,9:12/123456789
10,10:1
11,10:60
15,9:5/12345
15,10:1
15,14:1001
17,9:12/123456789
17,10:1
17,11:1
i.e. If a line starts with a number, ignore it else replace it with the number from the previous line until the first ','

So, for example,
15,9:5/12345
,10:1

becomes
15,9:5/12345
15,10:1

What is the easiest way to do this using standard unix commands?

Thanks in advance!
# 2  
Old 11-13-2007
First file with data (file.dat):
Code:
10,9:12/123456789
,10:1
11,10:60
15,9:5/12345
,10:1
,14:1001
17,9:12/123456789
,10:1
,11:1

Second file with program (prog):
Code:
#!/bin/ksh

curval=""

while read line
do
        val=$(echo $line | cut -d, -f1)
        if [ "$val" != "" ]
        then
                curval=$val
                echo $line
        else
                echo ${curval}${line}
        fi
done

Use the command:
Code:
./prog < file.dat

The result is:
Code:
10,9:12/123456789
10,10:1
11,10:60
15,9:5/12345
15,10:1
15,14:1001
17,9:12/123456789
17,10:1
17,11:1

# 3  
Old 11-13-2007
Code:
awk '!$1{$1=v}v=$1' FS="," OFS="," filename

Use nawk or /usr/xpg4/bin/awk on Solaris.
# 4  
Old 11-13-2007
thanks guys!
both solutions work perfectly, although i think i'll use radoulov's coz its quite quite fast in comparison Smilie

cheers!
# 5  
Old 11-13-2007
Yes, awk is a very good tool, but it's syntax is ... SmilieSmilieSmilie

Why make simple when one can make complicated? Smilie
# 6  
Old 11-14-2007
awk
hi,

Try this one.

coe:
Code:
awk  '
BEGIN{FS=","}
{
if ($1!=0 && $1+0==0)
print substr($0,index($0,",")+1)
else
print
}' filename

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