3 ways to read log file on the fly in linux

Posted on September 19, 2014, 9:26 pm

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Suppose that you have a log file generate each time when you launch your script.
How can you read this file on the fly (while the script is writing in to that file) ?

1-Using tee

./run-report.sh 2>&1 | tee /var/spt/log/runrepot.log

2-Using tail -f

./run-report.sh > /var/spt/log/runrepot.log 2>&1 | tail -f /var/spt/log/runrepot.log

3.Using Watch + tail

./run-report.sh > /var/spt/log/runrepot.log 2>&1 | watch tail -20 /var/spt/log/runrepot.log