dos batch iterate through a delimited string

batch-file, command-line

Solution

Update: If the number of items in the list is not known, it is still possible to parse all items with simple recursion on the head of the list. (I've changed the IPs to simple numbers for simplicity of the list)

Finally that Lisp class I took 18 years ago paid off...

@echo off
setlocal

set servers=1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24

echo %servers%

call :parse "%servers%"

goto :eos

:parse

set list=%1
set list=%list:"=%

FOR /f "tokens=1* delims=," %%a IN ("%list%") DO (
  if not "%%a" == "" call :sub %%a
  if not "%%b" == "" call :parse "%%b"
)

goto :eos

:sub

echo %1

goto :eos

:eos
endlocal

Problem

I have a delimited list of IPs I'd like to process individually. The list length is unknown ahead of time. How do I split and process each item in the list? ``` @echo off set servers=127.0.0.1,192.168.0.1,10.100.0.1 FOR /f "tokens=* delims=," %%a IN ("%servers%") DO call :sub %%a :sub echo In subroutine echo %1 exit /b ``` Outputs: ``` In subroutine 127.0.0.1 In subroutine ECHO is off. ``` Update: Using Franci's answer as reference, here's the solution: ``` @echo off set servers=127.0.0.1,192.168.0.1,10.100.0.1 call :parse "%servers%" goto :end :parse setlocal set list=%1 set list=%list:"=% FOR /f "tokens=1* delims=," %%a IN ("%list%") DO ( if not "%%a" == "" call :sub %%a if not "%%b" == "" call :parse "%%b" ) endlocal exit /b :sub setlocal echo In subroutine echo %1 endlocal exit /b :end ``` Outputs: ``` In subroutine 127.0.0.1 In subroutine 192.168.0.1 In subroutine 10.100.0.1 ```

Original source

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