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This option specifies that files are to be edited in-place. GNU sed does this by creating a temporary file and sending output to this file rather than to the standard output.1.
So it will break the pipe!
evo2 has a good point in post #6. Why can't you wait?
The Issue is I can't wait for that.
Let me elaborate. There is some junk character being added looks like ^@^@.......which fills up at first line only consuming more and more size..that makes upto 500-700MB size(surprisingly).So That makes my logs over loaded. Once i delete the first line then it freed 500-700 MB. Donno th reason why it does show.
but All I temporarily need to delete the first line.
So Cant wait..
Strickly speaking: No, it won't (you will probably lose some logged data).
Depending on the frequency of the logging it _might_ work. If nothing is logged while you run the above script it will work, if on the other hand the program does log one or more entries while you run the script, those entries will not show up in the log.