UNIX for Dummies Questions & Answers

In a recent bash, you could also try

Code:

export LOG1=myLogfile1.log
export LOG2=myLogfile2.log
export LOG3=myLogfile3.log
cat $LOG{1..3}

RudiC, Sir you are too good. Thank you for nice code.

Thanks,
R. Singh

I am surprised no one has pointed this out, but you might already know it:

1 - combine several log files into one file when it happens:

Code:

tail -f filename filename2 filename3 > logfile

This will take any input that comes into filename or the other two files and instantly place this in logfile.
This means that the logfile will contain the rows from the different input files sequentially. I.e:

Code:

output from a simulated logfile:
row from filename
row from filename
row from filename3
row from filename2
row from filename3
row from filename

which might not be what you want to achieve, but it works.

2 - > and >> are two different redirect operators in Unix.
> will create and overwrite a file while >> will create or append to a file.
I.e:

Code:

[~/Temp]$ cat file1
Scooby
[~/Temp]$ cat file2
Doo
[~/Temp]$ cat file1 > file3
[~/Temp]$ cat file2 > file3
[~/Temp]$ cat file3
Doo
[~/Temp]$ cat file1 > file3
[~/Temp]$ cat file2 >> file3
[~/Temp]$ cat file3
Scooby
Doo
[~/Temp]$

Hope this brings some value to your problem solving.