awk - 10 examples to split a file into multiple files.Split the files so that all the items whose value is greater than 500 are in the file "500G.txt", and the rest in the file "500L.txt". Since we want only the second field to go to the output files, we do: print $2.Ĥ. The print command prints the entire record. Split the files by having only the value(the second field) in the individual files, i.e, only 2nd field in the new files without the 1st field: As a result, we get the extension to the file names. The only change here from the above is concatenating the string ".txt" to the $1 which is the first field. Split the files by having an extension of. This means, the first record will get written to a file named 'Item1', and the second record to 'Item2', third to 'Item3', 4th goes to 'Item2', and so on.Ģ. This looks so simple, right? print prints the entire line, and the line is printed to a file whose name is $1, which is the first field. The files generated by the above co mmand are as below: i.e, All records pertaining to Item1 into a file, records of Item2 into another, etc. Split the file into 3 different files, one for each item. Let us consider a sample file with the following contents:ġ.
The files can be split into multiple files either based on a condition, or based on a pattern or because the file is big and hence needs to split into smaller files. You do not need to specify -line-buffered when grep is the last command, so this is sufficient: mtail /var/links/proc2/id/myprocess*/Daily/myprocess*.In this article of the awk series, we will see the different scenarios in which we need to split a file into multiple files using awk. Run it like this: mtail /var/links/proc2/id/myprocess*/Daily/myprocess*.log | grep -line-buffered "Search this: " $tail = File::Tail::Multi->new(RemoveDuplicate => 0,įiles => Ĭhange OutputPrefix to 'p' if you prefer full path prefixes. mtail to your executable path and make the script executable. Note that you may need to install the module from CPAN ( cpan -i File::Tail::Multi). This is an interesting question and the simple answer should be: Use the prefix switch with tail, but unfortunately this is currently not implemented in most versions of tail.Īs I see it, you have two options: adapt the standard tools to the task (see Udys answer) or write your own tool with your favorite scripting/programming language.īelow is one way you could do it with the File::Tail::Multi module for perl.
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