[SOLVED] appending header between lines

iconig · 07-06-2012, 03:21 PM

hi, I need to append the same header on each line of a file and creating separate files that contains the header and each line. I know how to append header to a file and saving the new file but I have been trying to do this:
say file named fn1 contains: london 1 1
another file named fn2 contains 23 1 1
34 1 1
5 1 1
I want to get 3 different files named S1, S2 and S3.
S1 will contain: london 1 1
23 1 1
S2 will contain: london 1 1
34 1 1
S3 will contain: london 1 1
5 1 1
Is there a way of doing it?

sycamorex · 07-06-2012, 03:31 PM

Can you post a sample of the original file with the headers: Please wrap it up in the code tags like below:

Code:

To preserve any formatting

And clearly distinguish files S1, S2 and S3:

S1

Code:

Some text wrapped in the code tags

S2

Code:

Some text wrapped in the code tags

S3

Code:

Some text wrapped in the code tags

Thank you

pixellany · 07-06-2012, 03:45 PM

Partial pseudocode, not tested:

Code:

while read header; do
     while read entry; do
          <set filename based on # of times thru the loop>
          echo $header > $filename
          echo $entry >> $filename
     done < entryfile
done < headerfile

iconig · 07-06-2012, 04:10 PM

header file name 'f1' : london 1 1

original file name 'f2' and the content is:
23 1 1
34 1 1
5 1 1

Expected result:

filename 's1' contains:
london 1 1
23 1 1

file name 's2' contains:
london 1 1
34 1 1

file name 's3' contains:
london 1 1
5 1 1

Sorry, I could not place it in tags as you said but this is close

pixellany · 07-06-2012, 04:28 PM

Note: If the "f1" file has only one entry, then do we need it at all? i.e. can you just set a variable to "london 1 1"?

Have you looked at the code I suggested?----any questions?

To put code in code tags, go to the advanced editing mode, select the code, and click on the "#"

iconig · 07-06-2012, 04:39 PM

taking the header file f1 and each line of f2, then creating separate files with each file containing header and each line is the issue. I tried setting f1 as a variable and running it along with f2 in a loop, but it did not run. what is the entry file?

pixellany · 07-06-2012, 04:52 PM

In my example the "entry" file is the one containing the entries---you called it "f2"

Please post the code that you tried.

sycamorex · 07-06-2012, 06:20 PM

As pixellany said, if f1 contains only one line it's not really needed, is it?

Try the following:

Code:

#!/bin/bash                                                                                               
                                                                                                          
f1="london 1 1"                                                                                           
file="/path/to/f2"                                                                          
a=1                                                                                                       
while read line                                                                                           
do                                                                                                        
    echo $f1 > S$a                                                                                        
    echo $line >> S$a                                                                                     
    <increment the variable a by 1>                                                                                              
done < $file

It's almost ready. There's only one line missing. You just need to find a way to increment the variable a by one each time it loops.

iconig · 07-06-2012, 06:52 PM

I don't think there should be $file after done since you have already given a file path. I added the increment but it still says syntas error after unexpected token done
#!/bin/bash
f1="london 1 1"
file="/home/cyril/f2"
a=1
while read line do
echo $f1 > $a
echo $line >> $a ; ((a ++ ))
done

sycamorex · 07-06-2012, 06:58 PM

Once again, please use code tags. Click Go Advanced, highlight your code and click #.

Quote:

I don't think there should be $file after done since you have already given a file path.

Yes, and how can the while loop know which file to source?

Your increment statement is not correct.

iconig · 07-06-2012, 07:04 PM

Is the filepath not supposed to do that? Forgive my naivity, trying to learn and get things done at the same time

iconig · 07-06-2012, 07:06 PM

Code:

Is the filepath not supposed to do that? Forgive my naivity, trying to learn and get things done at the same time

Code:

#!/bin/bash
f1="london 1 1"
file="/home/cyril/f2"
a=1
while read line do
echo $f1 > $a
echo $line >> $a ; ((a ++ ))
done

sycamorex · 07-06-2012, 07:09 PM

Quote:

Originally Posted by iconig

Is the filepath not supposed to do that? Forgive my naivity, trying to learn and get things done at the same time

No worries. We all learn something new everyday. The file path is not in any way connected to the while loop in the version that you posted.

sycamorex · 07-06-2012, 07:12 PM

Quote:

Originally Posted by iconig

Code:

Is the filepath not supposed to do that? Forgive my naivity, trying to learn and get things done at the same time

Code:

#!/bin/bash
f1="london 1 1"
file="/home/cyril/f2"
a=1
while read line do
echo $f1 > $a
echo $line >> $a ; ((a ++ ))
done

Either use:

Code:

while read line; do
    blah
    blah
done

or

Code:

while read line
do
    blah
    blah
done

iconig · 07-09-2012, 10:59 AM

I adjusted the code as you said and it parsed each line to separate files (wow, that was a major step) but the header file as not included in each file. Here is my code:

Code:

#!/bin/bash
f1="london 1 1"
file="/home/cyril/f2"
let a=1
while read line; do
    echo $f2 > S$a
    echo $line >> S$a
let a=$(($a+1))
done <f2