linux - How to modify /etc/environment from a bash script -

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Currently, I am trying to automate an action that we do at work. Whenever we install the Oracle's JDK, we need to manually add it to our global PATH variable. There is a quote from this process: 

  add it to the beginning of sudo vi / etc / environment path: "/opt/jdk1.6.0_45/bin:"   / etc / environment  is here:  
  PATH = "/ usr / local / sbin: / usr / local / bin: / usr / sbin: / Usr / bin: / sbin: / bin: / usr / games "  
 It will appear after its modification:  
  path =" / opt / jdk1 .6.0_45 / bin: / usr / local / sbin: / usr / local / bin: / usr / sbin: / usr / bin: / sbin: / bin: / usr / games "  < P> Do not forget that this file is not a script but rather a file Where key = value is. This file stores system-wide locale and path settings.  
  My question is  I  PATH  variable with  / etc / environment  without including any manual operation, preferably only Using a Bash script. Besides, I would like to avoid seeing my JDK path, if I have run the script twice as a result. P> You can use sed to remove it for the first time and then insert the jdk path:  
  #! / Bin / bash sed -e's /opt/jdk1.6.0_45/bin: || G '-i / etc / Environment SAD' s | Path = "\ (. * \)" | PATH = "/ opt / jdk1.6.0_45 / bin: \ 1" | G "-i / etc / environment

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