Can't print (echo) a specific array element in a batchscript
can noun meaning
I'm defining lists in a batch script and then like to print a specific element in each one of them, but getting an 'ECHO is off' output (is if it's empty).
I tried cycling trough the lists with a FOR loop and that worked fine.
This is the code for i'm trying to run
@echo off rem --------start of Define list-------- set clist= 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 set ilist= X Y Z A B C D E F G H I J K L M N O P Q R S T U V W set testl= 1 2 3 4 rem --------end of Define list-------- echo %clist% echo %ilist% echo %testl%
B Y 2
ECHO is off ECHO is off ECHO is off
Here's an example using the method described here, for creating your array like variables:
@Echo Off & SetLocal EnableDelayedExpansion Rem ------- Start of define list ------- Set "clist=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" Set "ilist=X Y Z A B C D E F G H I J K L M N O P Q R S T U V W" Set "testl=1 2 3 4" Rem -------- End of define list -------- Rem ------- Start of array lists ------- Set "i=0" Set "clist[!i!]=%clist: =" & Set /A i+=1 & Set "clist[!i!]=%" Set "i=0" Set "ilist[!i!]=%ilist: =" & Set /A i+=1 & Set "ilist[!i!]=%" Set "i=0" Set "testl[!i!]=%testl: ="& Set /A i+=1 & Set "testl[!i!]=%" Set "i=" Rem -------- End of array lists -------- Rem ----- Start your commands here ----- Echo %clist% Echo %ilist% Echo %testl% Pause Rem ------ End your commands here ------ EndLocal & GoTo :EOF
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If it was really your intention mimic an array, then it would be something similar to this.
@echo off setlocal EnableDelayedExpansion set "clist=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" set /a cnt=0 for %%a in (%clist%) do ( set "clist[!cnt!]=%%a" set /a cnt+=1 ) for /l %%i in (0,1,!cnt!) do echo( clist[%%i]=!clist[%%i]!
You can also separately echo the variables.
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If your "array" member values are always 1 character long, then a single variable with substring operations is all that is needed.
@echo off rem --------start of Define list-------- set "clist=ABCDEFGHIJKLMNOPQRSTUVWXYZ set "ilist=XYZABCDEFGHIJKLMNOPQRSTUVW set "testl=1234 rem --------end of Define list-------- echo %clist:~1,1% echo %ilist:~1,1% echo %testl:~1,1% rem Show all values in loop setlocal enableDelayedExpansion for /l %%N in (0 1 25) do ( echo clist[%%N] = !clist:~%%N,1! echo ilist[%%N] = !ilist:~%%N,1! echo testl[%%N] = !testl:~%%N,1! )
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- A space separated list does not an array make. When
cmd.exepeople talk about an "array," they usually mean creating multiple variables.
- There is no any concept of lists or arrays in batch scripting, only normal environment variables (like
VAR); but those are sometimes named like array-elements (like
VAR, etc.), which I call usually pseudo-arrays. Take a loop at this post: Arrays, linked lists and other data structures in cmd.exe (batch) script