[SOLVED] cp - how to copy data to an existed folder without asking overwrite?
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alias cp='cp -i'
alias l.='ls -d .* --color=auto'
alias ll='ls -l --color=auto'
alias ls='ls --color=auto'
alias mv='mv -i'
alias rm='rm -i'
alias which='alias | /usr/bin/which --tty-only --read-alias --show-dot --show-tilde'
I am trying rsync. To me, rsync is a big tool to be used in my case.
1) rsync efficiency is not better than cp command for new added stuff;
2) If logbackup folder has very big data like 40GB, the increament list created by rsync takes too much time.
I just need to copy new created logs to the backup folder.
Pls correct me if I am wrong on rsync.
Thanks a lot.
rsync is much better for backing up than cp, by far. Yes the increment list takes a long time on a big archive, but the advantage is rsync will ONLY copy over those files which have changed, whereas cp will overwrite everything, every time. If your disc has an 80MB/s write speed and you're backing up a 40GB archive, cp will take a minimum of 8-9 minutes. If it's a lot of small files, it could easily take upwards of 30 minutes or more. On the same operation, rsync may take 2-3 minutes to build up the increment list, but then it might only take 20 seconds to copy the changed files over, depending on how many have changed since the last backup. It's especially useful when backing up across a network connection, or the internet.
Last edited by suicidaleggroll; 01-19-2012 at 10:17 AM.
the advantage is rsync will ONLY copy over those files which have changed
It is even better than that. rsync detects the changes and copies only what actually has changed. If you have for example a large log-file and only a few lines have changed rsync will not copy the whole file, but only the changes.