Version of Kernel, Watch out, I mean the KERNEL
2.5.x 5.3.x Just remember two number, the first number means major version, the second number means minor version, let off the remain.
The Linux I‘ll Choose
Centos, comes from red hat enterprise linux, version 7.X, kerner version 3.10.X
Login Through SSH
This is aliyun ssh example
the command is:
ssh (name)
Directory of Linux
first class
bin dev home lib64 media opt root sbin sys usr
boot etc lib lost+found mnt proc run srv tmp var
and the directory "~" is "/root"
and "sbin" means "super binary" which belong to the user ROOT, not regular users.
- /opt: third party software (but nobody use it, instead we use /usr/local
- /mnt, /media, /misc: all for mount, but we only use /mnt
- /proc, /syc, /net: don‘t touch these, they are virtual file system, data inside is from the memory.
- /srv: some server data, don‘t touch it.
- /usr: means UNIX Software Resource , IMPORTANT RESOURCES, DON‘T FIDDLE WITH IT.
- /var: variable data, like log, cache.
second class
/usr/lib/ // the library that app use
/usr/local/ // the place our own softwares live
/usr/share/ //some resources like help documents, font resources
/usr/src/ // the source code, can be replaced by /usr/local/src and /usr/src/kernels
/usr/src/kernels/ // where the kernel lives
Reboot of Linux Server
? ? do some times sync command before the shutdown command, and only this reboot command is recommended.
shutdown -r now