Hi All,
I have a file say, sample.txt
I am using the above file in one of my script. I need to read from Line 3 of the above the file and do some process.
My script has a code:
The Output is:
Expected is:
The above command ignores line 3 and starts from line 4 even after giving as awk 'NR > 2'. Not sure why this happens.
Just want to understand why awk skips Line 3 even if it mentioned as 'NR > 2'
Last edited by machomaddy; 03-18-2013 at 07:24 AM..
I tried...Itz nt working. While is not reading the 1st line . I even created a temp file with Dept names alone and passed it in while loop as below
While is skipping the 1st line
---------- Post updated at 05:17 PM ---------- Previous update was at 05:09 PM ----------
OK. Let's analyze what is happening. We have a file named sample.txt containing:
and we have a script (reformatted and line numbers added for discussion):
So, first, the awk on line 1 reads and discards the first two lines from sample.txt and writes the last two lines from sample.txt into the pipe feeding line 2.
The read on line 2 sets Dep to 1001|3252 (consuming the 3rd line from sample.txt that was the 1st line output by the awk on line 1).
Then (since no other input file is specified) the awk on line 3 reads the remainder of the output from the awk on line 1 and prints 1002.
Then the next call to read on line 2 hits EOF and terminates the while loop.
If you want the awk on line 3 to process the data stored in $Dep, you could change your script to something like:
Note the text in red that I've added to your script. This modified script produces the output:
I hope this helps,
Don
All this could have been done in a single command.. No need of echo, 3-4 awk and while loops
Of course, I agree.
I assumed machomaddy plans to perform other processing on each (non-header) line of an input file and that the second awk was a placeholder for some other processing.
If all that machomaddy wants is to print up to the first vertical bar in every line after line 2 from an input file:
would be much more efficient.
This User Gave Thanks to Don Cragun For This Post:
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