jenkins setup
YIk Teng Hie
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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// list all running process
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$ ps aux
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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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// made executable
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$ chmod +x envtest.sh
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```
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## node version manager [nvm](https://github.com/nvm-sh/nvm)
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* For proper installing, using version manager for nodejs to install nodejs/npm
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* use nvm
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* to avoid npm version conflict installation with nodejs
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* to install / switch to lower / newer version on any version ubuntu
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* ubuntu 20.10 default support node 12
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* ubuntu 19.10 default 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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# This loads nvm
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$ [ -s "$NVM_DIR/nvm.sh" ] && \. "$NVM_DIR/nvm.sh"
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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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* ssh id
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```shell
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$ ssh-keygen
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// copy ssh public key to host .ssh/authorized_keys to allow passwordless ssh
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$ ssh-copy-id -i abc@host
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// alternatively, copy local .ssh/rsa_id.pub content into target server authorized_keys
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```
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* environments
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```shell
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// add global variable
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// method1 : cli
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$ export VARNAME="value"
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$ set VARNAME="Value"
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// add local variable
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$ VARNAME=Value
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// remove
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$ unset VARNAME
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$ VARNAME=''
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// user wide env
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$ sudo vi ~/.bashrc
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..
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export NAME=Value
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...
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// system wide ENV file
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$ nano /etc/environment
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// reload a file
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$ source /etc/bash.bashrc
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// show a variable
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$ echo $VARNAME
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// show all variables
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$ printenv | sort | less
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$ env | grep GNOME
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$ myvar=(first second third)
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$ echo ${myvar[2]}
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third
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$ echo ${myvar[*]}
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first second third
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```
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* startup file execution order from login shell
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* `/etc/profile`
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* `$HOME/.bash_login`
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* `$HOME/.bash_profile`
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* `$HOME/.profile`
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* startup file from interactive shell
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* `.bashrc` instead of `/etc/profile`
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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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// list all running process
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$ ps aux
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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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// made executable
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$ chmod +x envtest.sh
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```
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## node version manager [nvm](https://github.com/nvm-sh/nvm)
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* For proper installing, using version manager for nodejs to install nodejs/npm
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* use nvm
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* to avoid npm version conflict installation with nodejs
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* to install / switch to lower / newer version on any version ubuntu
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* ubuntu 20.10 default support node 12
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* ubuntu 19.10 default 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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# This loads nvm
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$ [ -s "$NVM_DIR/nvm.sh" ] && \. "$NVM_DIR/nvm.sh"
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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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* ssh id
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```shell
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$ ssh-keygen
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// copy ssh public key to host .ssh/authorized_keys to allow passwordless ssh
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$ ssh-copy-id -i abc@host
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// alternatively, copy local .ssh/rsa_id.pub content into target server authorized_keys
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```
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* environments
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```shell
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// add global variable
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// method1 : cli
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$ export VARNAME="value"
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$ set VARNAME="Value"
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// add local variable
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$ VARNAME=Value
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// remove
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$ unset VARNAME
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$ VARNAME=''
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// user wide env
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$ sudo vi ~/.bashrc
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..
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export NAME=Value
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...
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// system wide ENV file
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$ nano /etc/environment
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// reload a file
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$ source /etc/bash.bashrc
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// show a variable
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$ echo $VARNAME
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// show all variables
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$ printenv | sort | less
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$ env | grep GNOME
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$ myvar=(first second third)
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$ echo ${myvar[2]}
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third
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$ echo ${myvar[*]}
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first second third
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```
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* startup file execution order from login shell
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* `/etc/profile`
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* `$HOME/.bash_login`
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* `$HOME/.bash_profile`
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* `$HOME/.profile`
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* startup file from interactive shell
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* `.bashrc` instead of `/etc/profile`
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## Rebuild HOME
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* Repair fstab
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```sh
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// find the new UUID
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$ blkid
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// update the UUID
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$ nano /etc/fstab
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```
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* login as su
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```sh
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$ sudo su
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//
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$ mkhomedir_helper <username>
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```
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