CODEWITHSUNDEEP
parametersshellcmd
Dave
Dave

Reputation: 1081

Is there a way to indicate the last n parameters in a batch file?

In the following example, I want to call a child batch file from a parent batch file and pass all of the remaining parameters to the child.

C:\> parent.cmd child1 foo bar
C:\> parent.cmd child2 baz zoop
C:\> parent.cmd child3 a b c d e f g h i j k l m n o p q r s t u v w x y z

Inside parent.cmd, I need to strip %1 off the list of parameters and only pass the remaining parameters to the child script.

set CMD=%1
%CMD% <WHAT DO I PUT HERE>

I've investigated using SHIFT with %*, but that doesn't work. While SHIFT will move the positional parameters down by 1, %* still refers to the original parameters.

Anyone have any ideas? Should I just give up and install Linux?

Upvotes: 50

Views: 38454

Answers (8)

LogicDaemon
LogicDaemon

Reputation: 570

Warning! this method has side-effect of expanding wildcards, if there are «*»s or «?»s in the arguments. If there is a wildcard but no corresponding files, argument is skipped (non-wildcard arguments stay as-is). If arguments must stay intact, look for another way.

the line

%CMD% <WHAT DO I PUT HERE>

shall be changed to:

(
  SETLOCAL ENABLEDELAYEDEXPANSION
  SET skip=1

  FOR %%I IN (%*) DO IF !skip! LEQ 0 (
        SET "params=!params! %%I"
    ) ELSE SET /A skip-=1
)
(
  ENDLOCAL
  SET "params=%params%"
)
%CMD% %params%

of course, you may set skip var to any number of arguments.

Explaned:

(
@rem Starting block here, because it's read once and executed as one
@rem otherwise cmd.exe reads file line by line, which is waaay slower.

SETLOCAL ENABLEDELAYEDEXPANSION
SET skip=1

@rem if value contains unquoted non-paired parenthesis, SET varname=value 
@rem confuses cmd.exe. SET "a=value" works better even if value has quotes.
  FOR %%I IN (%*) DO (
    IF !skip! LEQ 0 (
      SET "params=!params! %%I"
      @rem newline after SET to lower amount of pitfalls when arguments 
      @rem have unpaired quotes
    ) ELSE (
      SET /A skip-=1
    )
)
(
@rem get variables out of SETLOCAL block
@rem as whole block in parenthesis is read and expanded before executing,
@rem SET after ENDLOCAL in same block will set var to what it was before
@rem ENDLOCAL. All other envvars will be reset to state before SETLOCAL.
ENDLOCAL
SET "params=%params%"
)
@rem doing this outside of parenthesis block to avoid
@rem cmd.exe confusion if params contain unquoted closing round bracket
%CMD% %params%

Upvotes: 10

LogicDaemon
LogicDaemon

Reputation: 570

Another way (almost the same as Alxander Bird's) without executing ECHO in a subshell:

FOR /F "usebackq tokens=1*" %%I IN ('%*') DO SET params=%%J

so, line

%CMD% <WHAT DO I PUT HERE>

will look like:

FOR /F "usebackq tokens=1*" %%I IN ('%*') DO %CMD% %%J

the problem is that if parameters include quoted stings with spaces inside, cmd.exe will parse them appropriately for using as numbered arguments (%1), but FOR will ignore the quotes. This specific case, it will harm if first parameter includes a space or more, which is quite possible, considering first argument can be, for example, "C:\Program Files\Internet Explorer\iexplore.exe".

So, here will be another answer.

Upvotes: 1

RichardSchorrig
RichardSchorrig

Reputation: 23

I have improved Moshe Goren's answer because it didn't seem to work for me:

set _input=%*
call set params=%%_input:%1 =%%
@echo %params%

Upvotes: 2

Moshe Goren
Moshe Goren

Reputation: 1

I came across this question while I was facing a similar problem, but I solved it using a different approach. Instead of re-creating the input line using a loop (as in the answer by @Joey) I simply removed the first parameter from the input string.

set _input=%*
set params=!_input:%1 =!
call OTHER_BATCH_FILE.cmd %params%

Of course, this assumes that all the parameters are different.

Upvotes: 0

shelleybutterfly
shelleybutterfly

Reputation: 3247

Although really the 'for' solution is superior in a lot of circumstances, for something simple I will frequently just save and shift the other arguments away, then use %* as usual (practically the same strategy often works for $* or $@ in {,ba,da,k,*}sh):

example:

:: run_and_time_me.cmd - run a command with the arguments passed, while also piping
::                       the output through a second passed-in executable

@echo off

set run_me=%1
set pipe_to_me=%2
shift
shift

:: or
:: set run_me=%1
:: shift
:: set pipe_to_me=%1
:: shift

%run_me% %* | %pipe_to_me%

Anyhow, I saw the question was long answered, but figured I'd drop in my two cents as it was something I didn't see, and because it was the answer I needed when I finally happened across it a few years back... and went "oh... duh." :)

Upvotes: 0

max_diff
max_diff

Reputation: 179

Here's a one-line approach using the "for" command...

for /f "usebackq tokens=1*" %%i in (`echo %*`) DO @ set params=%%j

This command assigns the 1st parameter to "i" and the rest (denoted by '*') are assigned to "j", which is then used to set the "params" variable.

Upvotes: 17

Alexander Bird
Alexander Bird

Reputation: 40639

You can actually just do this:

%*

If that is the only thing on the line, then that expands to having the first parameter be the command executed, with all other parameters passed to it. :)

Upvotes: 7

Joey
Joey

Reputation: 354586

%* will always expand to all original parameters, sadly. But you can use the following snippet of code to build a variable containing all but the first parameter:

rem throw the first parameter away
shift
set params=%1
:loop
shift
if [%1]==[] goto afterloop
set params=%params% %1
goto loop
:afterloop

I think it can be done shorter, though ... I don't write these sort of things very often :)

Should work, though.

Upvotes: 82

Related Questions