linux delete line in log code example

Example 1: linux clear lines of log

$ wc -l myscript.log
475494 myscript.log

$ echo "$(tail -1000 myscript.log)" > myscript.log

$ wc -l myscript.log
1000 myscript.log

Example 2: linux clear lines of log

tail -n 1000 myscript.log | sponge myscript.log