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prex1 - your code works perfectly and sorts exactly the way I wanted. The only odd thing it does is that it adds a blank line at the top of the file for each .cst file input. I ran my test with 10 files and it put 10 blank lines at the top.

Prex1 - The example sizes are the typical file sizes I'm working with and as for sorting by site, the site represents XY coordinates of the measurements. I was thinking I'd remove the comma to make it easier to sort. Ultimately, I only need to match up the measurements from file to file so I can...

I don't know where that ] came from at the end of the code snippet in my post above but it doesn't belong there....sorry if it caused any confusion.

Feherke, I'm testing out this line perl -nlae '$h=$_ if$.==1;($d=$F[19])=~s,(../..)/(....),$2/$1,;push@d,[@F,$d]if@F&&$_ ne$h;END{print join"\t",splice@{$_},0,-1for sort{$a->[-1]cmp$b->[-1]||$a->[15]cmp$b->[15]||$a->[0]<=>$b->[0]}@d}' *.cst,* > ALL_CST.cst ] but I'm getting Bareword found...

Thanks for the speedy response! The data is generated on a unix system but I pull the files remotely to my Windows based laptop and process it with strawberry perl. I'd be ok with processing the files line by line if that is a better way to do it. As i said, i'm new to perl so slurping a whole...

Hello, I run systems that collect measurement data and dump it into delimited text files. I'm trying to join these files and sort them by Date, Target_Name, and site so that i can plot the data. Currently, i have the following code that does work to join the files into a single file called...