Document envvars for all platforms

Document how to set environment variables from the terminal for bash,
cmd and PowerShell.

FAQ.md

@@ -103,10 +103,23 @@ You could overwrite the `adb` binary in the other program, or ask _scrcpy_ to
 use a specific `adb` binary, by setting the `ADB` environment variable:
 
 ```bash
+# in bash
 export ADB=/path/to/your/adb
 scrcpy
 ```
 
+```cmd
+:: in cmd
+set ADB=C:\path\to\your\adb.exe
+scrcpy
+```
+
+```powershell
+# in PowerShell
+$env:ADB = 'C:\path\to\your\adb.exe'
+scrcpy
+```
+
 
 ### Device disconnected
 

README.md

@@ -505,10 +505,23 @@ Suppose that this server is accessible at 192.168.1.2. Then, from another
 terminal, run `scrcpy`:
 
 ```bash
+# in bash
 export ADB_SERVER_SOCKET=tcp:192.168.1.2:5037
 scrcpy --tunnel-host=192.168.1.2
 ```
 
+```cmd
+:: in cmd
+set ADB_SERVER_SOCKET=tcp:192.168.1.2:5037
+scrcpy --tunnel-host=192.168.1.2
+```
+
+```powershell
+# in PowerShell
+$env:ADB_SERVER_SOCKET = 'tcp:192.168.1.2:5037'
+scrcpy --tunnel-host=192.168.1.2
+```
+
 By default, `scrcpy` uses the local port used for `adb forward` tunnel
 establishment (typically `27183`, see `--port`). It is also possible to force a
 different tunnel port (it may be useful in more complex situations, when more
@@ -542,10 +555,23 @@ ssh -CN -L5038:localhost:5037 -R27183:localhost:27183 your_remote_computer
 From another terminal, run `scrcpy`:
 
 ```bash
+# in bash
 export ADB_SERVER_SOCKET=tcp:localhost:5038
 scrcpy
 ```
 
+```cmd
+:: in cmd
+set ADB_SERVER_SOCKET=tcp:localhost:5038
+scrcpy
+```
+
+```powershell
+# in PowerShell
+$env:ADB_SERVER_SOCKET = 'tcp:localhost:5038'
+scrcpy
+```
+
 To avoid enabling remote port forwarding, you could force a forward connection
 instead (notice the `-L` instead of `-R`):
 
@@ -559,10 +585,23 @@ ssh -CN -L5038:localhost:5037 -L27183:localhost:27183 your_remote_computer
 From another terminal, run `scrcpy`:
 
 ```bash
+# in bash
 export ADB_SERVER_SOCKET=tcp:localhost:5038
 scrcpy --force-adb-forward
 ```
 
+```cmd
+:: in cmd
+set ADB_SERVER_SOCKET=tcp:localhost:5038
+scrcpy --force-adb-forward
+```
+
+```powershell
+# in PowerShell
+$env:ADB_SERVER_SOCKET = 'tcp:localhost:5038'
+scrcpy --force-adb-forward
+```
+
 
 Like for wireless connections, it may be useful to reduce quality: