checking production logs

how to check production logs

i logged to production server i went to server log path.
i did
ls -ltr

i see bunch of log files at different timestamps

lets say xyz.log is at 1:30 am which i am interested to see.

how to open and hjow to see it?

when i logged using winscp says log in denied to copy over to windows laptoip to check.
like i want to zgprep or grep all "NullPointerErrors" between 12:30 AM till 2:30AM how do i check?
Also how to check how many times it was restarted?
any good best practices on production logs?
please advise any god links, resources on it?
LVL 7
gudii9Asked:
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Dmitri FarafontovLinux Systems AdminCommented:
Are they Apache, NGINX logs or what web server are you running? Format of the logs will be different.
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Dmitri FarafontovLinux Systems AdminCommented:
auto close.
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