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The read statement should just use FILENAME.

Your script suffers from a pervasive lack of double quoted variables. Even the character counting is buggy because $line isn't quoted.

If after...

Also just noticed "n=0" should this be "nu=0"?

LBNL, make sure you have indented correctly, it does make it difficult to read...

remove the outer brackets.

if [[ "$ida" == "_W_" || "$ida" == "_SA" ]] && [[ "$chk_dy" == "Sun" || "$chk_dy" == "Sat" ]]; then
echo "id is $ida and chk_dy is $chk_dy"
fi

OR Else you can use two commands in a single stratch as :


sed -e :a -e '$q;N;1001,$D;ba' orig_file >copy_file ;mv copy_file orig_file

I'm thinking your issue is more I/O related than an issue with tail; maybe the onus is on the write speed as opposed to your accessing the last 1000 lines of the file. You could even read it into...

The approach will depend on the Operating System and the related tools, whether the file is currently open by a process (like syslogd), and whether it is a normal unix text file suitable for...