>>> On Tue, Sep 4, 2007 at 2:21 PM, in message
<[EMAIL PROTECTED]>, "Scully, William P"
<[EMAIL PROTECTED]> wrote:
> What's the best technique for trimming a file? IE: I have file
> "/var/log/toolarge". What's the fastest technique to discard
>
> - The first 10,000 records?
sed -i -e '1,10000 d' /var/log/toolarge
> - The last 10,000 records?
count=$(wc -l /var/log/toolarge | cut -f1 -d" ")
let start=$count-9999
if [ ${start} -le 1 ]; then
echo start is set to 1
let start=1
fi
sed -i -e "$start,$ d" /var/log/toolarge
> And as a bonus, since files are stream oriented, what's the fastest
> technique for finding out how many records are in the file?
wc -l /var/log/toolarge
Mark Post
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