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Please help me format this file:

Source file looks like this, there are three columns, separated by space. First column has varrying width:
1 248105240 W25_2013
10 248103710 W06_2013
100...

I have to create a single file from three files, Please see below for samples:

day.txt
20090101
20090102

item.txt
123456789101
12345678910209
1234567891

str.txt
1
12
123
...

Thanks!!! worked like magic

Source File:

abcdefghijklmnop01qrstuvwxyz
abcdefghijklmnop02qrstuvwxyz
abcdefghijklmnop03qrstuvwxyz
abcdefghijklmnop04qrstuvwxyz
abcdefghijklmnop05qrstuvwxyz


Whatever characters are in...

thanks Jim but when I use paste the spaces doesn't seem rigth with the "new line character" showing as a big white space in between the merged lines.

For example:

File 1:
abc def ghi
jkl mno pqr

File 2:
stu vwx yza
bcd efg hij
klm nop qrs

I want the reult to be:
abc def ghistu vwx yza
jkl mno pqrbcd efg hij
klm nop qrs

Thanks Shahul! Sorry for the repeated reply... i dont have an available environment as of he moment to test it. I really appreciate your help on this.

So if the replacement pattern is 20 characters long, it would only overwrite 200-220 charcter?

Thanks that's helpful, just wondering if i need to replace only the 200th-220th character of each line, what would the command look like?

Thank you for that but what if the 4th column are strings with spaces in between? Is there a way to dictate awk to start looking at a certain point like looking at every 200th character of each line?

Thanks for the reply but I dont know the specific command that will work in this scenario. Would you know how to do that?

Col1 Col2 Col3 Col4

12 Completed 08 0830
12 In Progress 09 0829
11 For F U 07 0828

Considering the file above, how...