如何從 PATH 變數中替換某個路徑？

我正在使用 Cygwin，並想通過 bash shell 修改以下 PATH：

/usr/local/bin:/usr/bin:/cygdrive/c/Program Files (x86)/Microsoft Visual Studio 10.0/VSTSDB/Deploy:/cygdrive/c/Program Files (x86)/Microsoft Visual Studio 10.0/Common7/IDE:/cygdrive/c/Program Files (x86)/Microsoft Visual Studio 10.0/VC/BIN:/cygdrive/c/Program Files (x86)/Microsoft Visual Studio 10.0/Common7/Tools:/cygdrive/c/Windows/Microsoft.NET/Framework/v4.0.30319:/cygdrive/c/Windows/Microsoft.NET/Framework/v3.5:/cygdrive/c/Program Files (x86)/Microsoft Visual Studio 10.0/VC/VCPackages:/cygdrive/c/Program Files (x86)/HTML Help Workshop:/cygdrive/c/Program Files (x86)/HTML Help Workshop:/cygdrive/c/Program Files (x86)/Microsoft SDKs/Windows/v7.0A/bin/NETFX 4.0 Tools:/cygdrive/c/Program Files (x86)/Microsoft SDKs/Windows/v7.0A/bin:/cygdrive/c/Python33:/cygdrive/c/_WORK/java/jdk1.6.0_30/bin:/cygdrive/c/Windows/system32:/cygdrive/c/Windows:/cygdrive/c/Windows/System32/Wbem:/cygdrive/c/Windows/System32/WindowsPowerShell/v1.0:/cygdrive/c/Program Files (x86)/QuickTime/QTSystem:/cygdrive/c/Program Files (x86)/Common Files/Roxio Shared/DLLShared:/cygdrive/c/Program Files (x86)/Common Files/Roxio Shared/10.0/DLLShared:/cygdrive/c/Program Files/WIDCOMM/Bluetooth Software:/cygdrive/c/Program Files/WIDCOMM/Bluetooth Software/syswow64:/cygdrive/c/Program Files/Intel/WiFi/bin:/cygdrive/c/Program Files/Common Files/Intel/WirelessCommon:/cygdrive/c/Program Files (x86)/apache-ant-1.8.3/bin:/cygdrive/c/Program Files (x86)/Code Collaborator Client:/cygdrive/c/Program Files/TortoiseSVN/bin:/cygdrive/c/Program Files/Intel/WiFi/bin:/cygdrive/c/Program Files/Common Files/Intel/WirelessCommon

路徑很大。

中間某處有

c/_WORK/java/jdk1.6.0_30/bin。

我想做的是暫時將其替換為

c/_WORK/java/jdk1.7.0_40/bin

換句話說，我想使用不同的 Java SDK 版本。有時我會使用 1.6 有時會使用 1.7。

我將如何更改 Java SDK 路徑？

簡單地說，通過執行以下命令來自定義變數：

PATH="path_to_your_jdk_bin_dir:$PATH"
export PATH

新路徑將優先於另一條路徑。要使此更改在您的配置文件中永久生效，請將這兩行放入~/.bash_profileor~/.profile文件中。

此外，我建議JAVA_HOME正確設置變數。

您可以創建符號連結

引用自：https://serverfault.com/questions/543209