Ubuntu - wlshiu/my_note GitHub Wiki

  • list install

    $ dpkg -l | grep [name]

  • remove lib

    $ sudo apt-get autoremove --purge [lib name]

  • zip

    $ zip -re filename.zip filename

  • 解壓 deb file

    $ dpkg -x xxx.deb <target dir>

Python

  • 使用 update-alternatives 設定 python default

    $ sudo update-alternatives --install /usr/bin/python python /usr/bin/python2.7 1
$ sudo update-alternatives --install /usr/bin/python python /usr/bin/python3.7 2

  • 列出目前所有的 python version

    $ update-alternatives --list python

  • 切換 python default vesion

    替換 python (提供 /usr/bin/python)

    $ update-alternatives --config python
There are 2 choices for the alternative python (providing /usr/bin/python).

  Selection    Path                Priority   Status
------------------------------------------------------------
* 0            /usr/bin/python3.7   2         auto mode
  1            /usr/bin/python2.7   1         manual mode
  2            /usr/bin/python3.7   2         manual mode

Press <enter> to keep the current choice[*], or type selection number:

手動掛載 disk

  • 格式化 disk
# 一般名為:Disk /dev/sdb
$ sudo fdisk -l
$ sudo fdisk /dev/sdb
    command (m for help):m
    command (m for help):n      # new a partition
    Partition number(1-4):1     # select the target partition
    ...
    command (m for help):w      # write and exit
$ sudo mkfs.ext4 /dev/sdb1      # file system format
  • 掛載
$ ls /dev/sd*
$ sudo mount /dev/sdb1 /data/
$ sudo chown <username>:<groupname> /data

$ sudo mount /dev/sdb1 $HOME/working/data/

Command

  • ln [-hs] <source file/dir> <target source/dir>

    • -s Synbolic Link

      原檔案或目錄被砍掉時, 這個 link 就會失效

      # 在 $HOME建立一個連結, 連到 var/www/wpmu
$ ln -s /var/www/wpmu $HOME/wpmu

    • -h hard link

  • 多檔案取代

    $ grep -RiIl 'search' | xargs sed -i 's/search/replace/g'

ubunut apt update fail

$ sudo sed -i -- 's/us.archive/old-releases/g' /etc/apt/source.list
$ sudo sed -i -- 's/security/old-releases/g' /etc/apt/source.list
$ sudo apt update
$ sudo apt install curl

# 更換公鑰
$ curl -L https://debian.datastax.com/debian/repo_key | sudo apt-key add

# 更換 DNS
$ sudo vi /etc/resolv.conf
    nameserver 8.8.8.8

ssh 登入

  • generate ssh key

    $ ssh-keygen
    Your identification has been saved in /home/username/.ssh/id_rsa_ubuntu.
    Your public key has been saved in /home/username/.ssh/id_rsa_ubuntu.pub.
    The key fingerprint is:
    SHA256:nNnQckFbuegUs4WD3y+7YqwCaDhfUlX2J17jxF7X3FU [email protected]
    The key's randomart image is:
    +---[RSA 2048]----+
    |       .o++ ..  E|
    |      .  *o+.  ..|
    |     .  = *+ o ..|
    |    .  . Ooo+ * +|
    | . o    Soo..B o.|
    |o + o     . ..o  |
    | + o .   .  . .  |
    |  .   .   +  o   |
    |       ..o .o.   |
    +----[SHA256]-----+
$ ls ~/.ssh
    id_rsa  id_rsa.pub

  • 免密碼登入

    • local side

      $ cp ~/.ssh id_rsa.pub ~/authorized_keys

    • remote side

      put authorized_keys of local to remote

      $ cd ~/.ssh
$ ls
    authorized_keys  id_rsa  id_rsa.pub

JAVA

  • java.lang.IllegalArgumentException: Malformed \uxxxx encoding

昨天項目中遇到一個 java.lang.IllegalArgumentException: Malformed \uxxxx encoding. 這樣的一個異常, debug了一下發現是讀取properties裡面的配置文件路徑的時候發生的. 網上找了一些解決方案, 只要把路徑中的 \ 改為 / 就行了, 或者改為 \\ 也行

Net

PSCP 介紹

PSCP 是一套使用命令提示列的軟體, 它提供 SCP client 的功能

λ pscp
PuTTY Secure Copy client
Release 0.70
Usage: pscp [options] [user@]host:source target
       pscp [options] source [source...] [user@]host:target
       pscp [options] -ls [user@]host:filespec
Options:
  -V        print version information and exit
  -pgpfp    print PGP key fingerprints and exit
  -p        preserve file attributes
  -q        quiet, don't show statistics
  -r        copy directories recursively
  -v        show verbose messages
  -load sessname  Load settings from saved session
  -P port   connect to specified port
  -l user   connect with specified username
  -pw passw login with specified password
  -1 -2     force use of particular SSH protocol version
  -4 -6     force use of IPv4 or IPv6
  -C        enable compression
  -i key    private key file for user authentication
  -noagent  disable use of Pageant
  -agent    enable use of Pageant
  -hostkey aa:bb:cc:...
            manually specify a host key (may be repeated)
  -batch    disable all interactive prompts
  -proxycmd command
            use 'command' as local proxy
  -unsafe   allow server-side wildcards (DANGEROUS)
  -sftp     force use of SFTP protocol
  -scp      force use of SCP protocol
  -sshlog file
  -sshrawlog file
            log protocol details to a file

  • download

    # pscp [選項] 使用者名稱@host ip或名稱:要下載檔案的位置 本機存儲的位置
$ pscp [email protected]:/home/user/picture.jpg c:/document/picture.jpg

  • upload

    # pscp 要上傳檔案的位置 [選項] 使用者名稱@host ip或名稱:遠端存儲的位置
$ pscp C:/document/picture.jpg [email protected]:/home/user/picture.jpg
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