Git
How to rebase your branch
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| git checkout branchname
git rebase master
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Change local user name
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| git config user.name "Your name"
git config user.email "Your email"
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Synchronise git branch with master
Git Forks And Upstreams
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| git checkout branchname
# some work and some commits
# some time passes
git fetch upstream
git rebase upstream/master
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Sychronise git master
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| git checkout master
git fetch upstream
git merge upstream/master (or git rebase upstream/master)
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Delete the commit on remote github
See here
First remove the last commit
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| git rebase -i HEAD~2 ( Or use the option in IDE )
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Force push
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| git push origin +branchname --force
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Worktree
It is useful when you want to push a folder to a different branch.
For example, push public/ to gh-pages
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| git worktree add -B gh-pages public upstream/gh-pages
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Network
check port being forwarded
ssh without password
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| ssh-keygen -t rsa(with default config)
ssh-copy-id root@172.100.51.192
ssh root@ip.address
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overwatch tcp call
Tool: tcpdump
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| tcpdump -i vmgmt port http and dst www.heise.de
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download from remote host
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| scp your_username@remotehost.edu:foobar.txt /local/dir
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System
unmount busy device
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| umount -l /path/to/busy-device
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unmount busy nfs
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| umount -f /path/to/busy-network-file-system
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write random data to file
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| dd if=/dev/urandom of=sample.txt bs=1G count=1
dd if=/dev/urandom of=sample.txt bs=64M count=16
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firewall
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| /etc/init.d/firewall start
/etc/init.d/firewall stop
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Database
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| show databases;
GRANT ALL ON `DATABASE`.* TO 'user'@'localhost' IDENTIFIED BY 'password';
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