This line of code :
awk '{ if ( NR == 1 ) { head=substr($0,1,300);} else { last = substr($0,1,300);}END{printf "Header is : %-300s Trailer is : %-300s\n", head, last}' filename
converted Header and Trailer in one line and within 300 character each.The output is just one line.
Now I want to overwrite this one line above (Header+ Tail) over the first line of original file (orginal header) and delete the Tail........i can copy this header and tail to new file and then append Record 1 to Record n to this new file, but that will cause too low performance........so I think better to update first and the last line of the this file.................so how can i do that?
i.e. 1-update the header with new line i.e. (header+trailer)
2-delete the tail in original file (may be using cut tail -1 filename?)
There has been another thread as lorcan said and this seems to be only a continuation of the above thread in a new post.
Please continue to post your question in the same thread so that it would be easier to follow up rather than starting a new thread for the same question.
Assuming I have understood your requirement try this,
combined header and trailer is available followed by that
header is available
all the records are displayed
trailer record is not displayed
If this is not what you had asked for, let us know
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