Linux tips
From CSWiki
- Changing Default permissions when creating a new directory
umask u=rwx,g=rwx,o=
add umask in .bashrc in an "if" expression like to make rsync proper
- Set default group
newgrp groupname
Remark: this command will start a nested shell. If you want to use the command in a startup script like in .bashrc, to avoid infinite loop, you should put it in an "if" expression like this: if [ `id -gn` != "object3d" ] then newgrp object3d exit fi
- Change default shell
chsh -s /bin/bash haosu
- I/O Redirection
if you want to redirect both standard out and standard error, you can use: 1>out 2>&1, where out is a filename, 1 stands for STDOUT, and 2 for STDERR
- sync data
rsync -avze ssh davinci:~/matlab-jc/ps/ ~/matlab_jc/ps/
