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78 lines
1.3 KiB
Markdown
78 lines
1.3 KiB
Markdown
5 years ago
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# Useful shell command
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* commands
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```shell
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// add a user to root group
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$ visudo
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# User privilege specification
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root ALL=(ALL:ALL) ALL
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newuser ALL=(ALL:ALL)ALL
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hold `ctrl` and press `x` to save and exit
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```
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* run as root
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```shell
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user@host$ sudo su -
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// prompt will show root login
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root@host$
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```
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* add a user to a group
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```shell
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// create docker group
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$ sudo groupadd docker
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// add current user to group
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$ sudo usermod -aG docker ${USER}
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// restart to take effect
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```
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* change file permission
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```shell
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// excecute, read, write
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$ chmod 777 filename
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//
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```
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## node version manager [nvm](https://github.com/nvm-sh/nvm)
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* version manger for nodejs
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* use nvm to avoid npm version conflict installation
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* ubuntu 20.10 support node 12
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* ubuntu 19.10 support node 10
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```shell
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// installation
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$ curl -o- https://raw.githubusercontent.com/nvm-sh/nvm/v0.38.0/install.sh | bash
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$ wget -qO- https://raw.githubusercontent.com/nvm-sh/nvm/v0.38.0/install.sh | bash
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$ export NVM_DIR="$([ -z "${XDG_CONFIG_HOME-}" ] && printf %s "${HOME}/.nvm" || printf %s "${XDG_CONFIG_HOME}/nvm")"
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[ -s "$NVM_DIR/nvm.sh" ] && \. "$NVM_DIR/nvm.sh" # This loads nvm
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// to install node version 10.10.0
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$ nvm install 10.10.0
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// remove node to solve conflicting version
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$ sudo apt-get remove nodejs
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$ sudo apt autoremove
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```
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