Linux命令集合

实时输出文件最后几行 tail -n 10 -f /path/to/file.log
在当前目录下查找指定字符串 find . -type f -name "*.mk" | xargs grep -Hn --color=auto "core_base"
忽略git记录中文件权限变更或mode改变导致的diff冗余信息 git config --add core.filemode false
批量解压cat rk3328_sdk.tar.gz* | tar -xzv
切换java环境

sudo tar zxvf jre-8u73-linux-x64.tar.gz
sudo update-alternatives --install /usr/bin/java java /usr/lib/jvm/jre1.8.0_391/bin/java 1000
sudo update-alternatives --config java

当编译时提示java版本和javac版本不一致时，一般是javac没有配置到可选列表

************************************************************
You are attempting to build with the incorrect version
of javac.
 
Your version is: javac 1.8.0_45-internal.
The correct version is: 1.6.
 
Please follow the machine setup instructions at
    https://source.android.com/source/download.html
************************************************************

duanxuesong@ubuntu:~/test/sprd_sharkle_sl8521et_19.34.5$ sudo update-alternatives --config javac
[sudo] password for duanxuesong: 
There are 2 choices for the alternative javac (providing /usr/bin/javac).

  Selection    Path                                         Priority   Status
------------------------------------------------------------
* 0            /usr/lib/jvm/java-8-openjdk-amd64/bin/javac   1081      auto mode
  1            /usr/lib/jvm/java-7-openjdk-amd64/bin/javac   1051      manual mode
  2            /usr/lib/jvm/java-8-openjdk-amd64/bin/javac   1081      manual mode

duanxuesong@ubuntu:/usr/lib/jvm/jdk1.6.0_45/bin$ sudo update-alternatives --install /usr/bin/javac javac /usr/lib/jvm/jdk1.6.0_45/bin/javac 3
duanxuesong@ubuntu:/usr/lib/jvm/jdk1.6.0_45/bin$ update-alternatives --list javac
/usr/lib/jvm/java-7-openjdk-amd64/bin/javac
/usr/lib/jvm/java-8-openjdk-amd64/bin/javac
/usr/lib/jvm/jdk1.6.0_45/bin/javac
duanxuesong@ubuntu:/usr/lib/jvm/jdk1.6.0_45/bin$ sudo update-alternatives --config javac
There are 3 choices for the alternative javac (providing /usr/bin/javac).

  Selection    Path                                         Priority   Status
------------------------------------------------------------
* 0            /usr/lib/jvm/java-8-openjdk-amd64/bin/javac   1081      auto mode
  1            /usr/lib/jvm/java-7-openjdk-amd64/bin/javac   1051      manual mode
  2            /usr/lib/jvm/java-8-openjdk-amd64/bin/javac   1081      manual mode
  3            /usr/lib/jvm/jdk1.6.0_45/bin/javac            3         manual mode

Press enter to keep the current choice[*], or type selection number: 3

Linux命令集合

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