SHIFT: Shifts the position of replaceable parameters in batch files.


... "SHIFT" Excerpt from Microsoft Windows Help
... The examples for the command "SHIFT"
... Important information, tips for the "SHIFT" command

The command: "SHIFT" is on Windows 11, 10, .. available

"SHIFT" Excerpt from Microsoft Windows Help

Microsoft Windows [Version 10.0.19045.3693]
(c) Copyright 1985-2023 Microsoft Corp.

C:\\WINDOWS>

Changes the position of replaceable parameters in a batch file.

SHIFT [/n]

If Command Extensions are enabled the SHIFT command supports
the /n switch which tells the command to start shifting at the
nth argument, where n may be between zero and eight.  For example:

    SHIFT /2

would shift %3 to %2, %4 to %3, etc. and leave %0 and %1 unaffected.

The examples for the command "SHIFT"

The `SHIFT` command in Windows Command Prompt is used to move the position of parameters in a batch file. Here are some examples of using the `SHIFT` command: Example 1: Iterate through parameters in a batch file:

@ECHO OFF
:LOOP
IF "%1"=="" GOTO END
ECHO parameters: %1
SHIFT
GOTO LOOP
:END

Description: This example uses a loop to iterate through all parameters in a batch file and display them one by one. The `SHIFT` command is used to shift the position of the parameters. Example 2: Sum parameters in a batch file:

@ECHO OFF
SET SUM=0
:ADD_LOOP
IF "%1"=="" GOTO END_ADD
SET /A SUM+= %1
SHIFT
GOTO ADD_LOOP
:END_ADD
ECHO sum: %SUM%

Description: In this example the parameters are summed in a loop. The `SHIFT` command moves the parameter position, and `SET /A` is used to update the sum. Example 3: Working with nested loops and SHIFT:

@ECHO OFF
:OUTER_LOOP
IF "%1"=="" GOTO END_OUTER
ECHO Outer Parameters: %1
SHIFT
:INNER_LOOP
IF "%1"=="" GOTO END_INNER
ECHO Inner Parameter: %1
SHIFT
GOTO INNER_LOOP
:END_INNER
GOTO OUTER_LOOP
:END_OUTER

Description: This example shows how `SHIFT` can be used in nested loops. The outer loop processes outer parameters while the inner loop processes the inner parameters. Example 4: Skipping parameters with SHIFT:

@ECHO OFF
SHIFT
SHIFT
ECHO Third parameter: %1

Description: Here the first two parameters are skipped with two consecutive `SHIFT` commands and the third parameter is displayed. Example 5: Check and handle parameters:

@ECHO OFF
:PARAM_LOOP
IF "%1"=="" GOTO END_PARAM
IF /I "%1"=="/DEBUG" (
    ECHO debug mode activated.
    SHIFT
    GOTO PARAM_LOOP
)
ECHO Process parameters: %1
SHIFT
GOTO PARAM_LOOP
:END_PARAM

Description: This example checks whether the first parameter is "/DEBUG". If this is the case, a message is issued and the parameter is skipped. The `SHIFT` command is particularly useful in batch scripts where a variable number of parameters need to be processed. Note that `SHIFT` moves the contents of the parameter list and reassigns parameter positions. Therefore, it is important to use `SHIFT` wisely and according to the logic of your batch script.

Important information, tips for the "SHIFT" command

There are a few important aspects to consider when using the `SHIFT` command in batch scripts: 1. Parameter loss: When you call `SHIFT`, this shifts the position of the parameters to the left in the parameter list. This means that the value of the first parameter (`%1`) is replaced by that of the second parameter (`%2`), the second parameter becomes the third (`%3`), and so on. The value of the last parameter (`%9`) is lost and the value of `%0` (the script name) remains unchanged. 2. Number of shifts: You can only call `SHIFT` nine times in a batch script because there are only nine numeric parameters (`%0` to `%9`). After the ninth shift, the value of the ninth parameter remains lost. 3. SHIFT in loops: When using `SHIFT` in a loop, you should ensure that the conditions are checked properly to avoid an infinite loop if there are no other parameters.

   @ECHO OFF
   :LOOP
   IF "%1"=="" GOTO END_LOOP
   ECHO parameters: %1
   SHIFT
   GOTO LOOP
   :END_LOOP
   
4. SHIFT in nested loops: When using `SHIFT` in nested loops, note that moving the parameters in a loop also affects the parameter positions in the nested loops.

   @ECHO OFF
   :OUTER_LOOP
   IF "%1"=="" GOTO END_OUTER
   ECHO Outer Parameters: %1
   SHIFT
   :INNER_LOOP
   IF "%1"=="" GOTO END_INNER
   ECHO Inner Parameter: %1
   SHIFT
   GOTO INNER_LOOP
   :END_INNER
   GOTO OUTER_LOOP
   :END_OUTER
   
5. Delayed expansion and SHIFT: If you use `SHIFT` in combination with delayed expansion (`ENABLEDELAYEDEXPANSION`), note that `!` is used for delayed expansion, not `%`.

   @ECHO OFF
   SETLOCAL ENABLEDELAYEDEXPANSION
   SET COUNT=0
   :LOOP
   IF "!1"=="" GOTO END_LOOP
   SET /A COUNT+=1
   SHIFT
   GOTO LOOP
   :END_LOOP
   ECHO Number of parameters: %COUNT%
   
It is important to carefully plan the order and frequency of `SHIFT` to ensure that the parameters are shifted as expected and no information is lost. Checking for empty parameters (`IF "%1"==""`) is also important to avoid infinite loops.


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The command SHIFT - Shifts the position of replaceable parameters in batch files.

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