Use cut:
tail -f log.txt | cut -b 1-50
質問
I have a text log of computation which contains a line for each iteration. We track the computation with
tail -f log.txt
But the lines of log file are very long and the tail output is unreadable.
I've tried this
tail -f log.txt | head -c 50
but it shows only beginning of the first line, but not lines which are produced after.
How can I dynamically display only first 50 characters of newly added line to the log file?
Thank you
解決
Use cut:
tail -f log.txt | cut -b 1-50
他のヒント
This is working for me:
tail -f log.txt | awk '{print substr ($0, 0, 50)}'