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what does the keyword 'shift' mean when used in a batch script

Posted on 2008-06-11
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Last Modified: 2010-04-21
as the title suggests - what does the keyword 'shift' mean when used in a batch script
eg  if "%1" == "/i"         (set Install=1)   & shift & goto LParseArgs

(from install.bat)
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Question by:millerthegorilla
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5 Comments
 
LVL 33

Expert Comment

by:knightEknight
ID: 21763656
it moves %2 to %1,  %3 to %2,  %4 to %3,  etc
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LVL 33

Expert Comment

by:knightEknight
ID: 21763670
for example, save this script as test.bat and run it like this:  test.bat  abc  123  xyz  456   pdq   789


@echo off
  echo param1: %1,  param2: %2,  param3: %3,  param4: %4,  param5: %5,  param6: %6
  shift
  echo param1: %1,  param2: %2,  param3: %3,  param4: %4,  param5: %5,  param6: %6
  shift
  echo param1: %1,  param2: %2,  param3: %3,  param4: %4,  param5: %5,  param6: %6
  shift
  echo param1: %1,  param2: %2,  param3: %3,  param4: %4,  param5: %5,  param6: %6
  shift
  echo param1: %1,  param2: %2,  param3: %3,  param4: %4,  param5: %5,  param6: %6
  shift
  echo param1: %1,  param2: %2,  param3: %3,  param4: %4,  param5: %5,  param6: %6
  shift

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LVL 33

Expert Comment

by:knightEknight
ID: 21763687
... this allows you to have more than 9 parameters to the batch file and still work with them using %1-%9.
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LVL 33

Accepted Solution

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knightEknight earned 2000 total points
ID: 21763701
From your example:

  eg  if "%1" == "/i"         (set Install=1)   & shift & goto LParseArgs

if the first parameter is /i then set a variable called Install to 1, then shift the batch parameters, then goto the LParseArgs label in the batch file.
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Author Closing Comment

by:millerthegorilla
ID: 31466321
Tah very much!
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