Batch script: append data to text file in only one line

Question

I have text file "whitelist.txt" with one line:

whitelist_mac="11:11:11:11:11:11 22:22:22:22:22:22 33:33:33:33:33:33"

I need a batch script to add a new mac address 44:44:44:44:44:44 to this text in only one line at the end of line with (")

After I run the batch script the modified file should look like this:

whitelist_mac="11:11:11:11:11:11 22:22:22:22:22:22 33:33:33:33:33:33 44:44:44:44:44:44"

My attempt of a script is this:

@echo off
set /p mac=Add new MAC adress to whitelist:
echo whitelist_mac=%mac% >> whitelist.txt
pause

Richard · Accepted Answer · 2016-12-02 20:48:52Z

1

You can do it with a FOR loop, the only difficulty is working out how to escape the double quote delimiter

If it's the only line in whitelist.txt, the following works

set /p mac=Add new MAC adress to whitelist:
set whitelist=
FOR /F delims^=^"^ tokens^=2  %%G IN ('type whitelist.txt') DO  (set whitelist=%%G)
echo whitelist_mac^=^"%whitelist% %mac%^">whitelist.txt

If there are other lines, then you'll need to do some work with find/findstr (might be worth doing anyway to check for duplicates and check the validity of the provided MAC address)

answered Dec 2, 2016 at 20:48

Richard

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4 Comments

taigun ali Over a year ago

Thanks! Only one line. For enter the same MAC adress in two different files, is: echo whitelist_mac^=^"%whitelist% %mac%^">whitelist.txt whitelist2.txt

Richard Over a year ago

No, but you can do echo whitelist_mac^=^"%whitelist% %mac%^">whitelist.txt && copy /y whitelist.txt whitelist2.txt

taigun ali Over a year ago

set /p mac=Add new MAC adress to whitelist: set whitelist= FOR /F delims^=^"^ tokens^=2 %%G IN ('type mac_ath0.txt') DO (set whitelist=%%G) echo nvram set ath0_maclist^=^"%whitelist% %mac%^">mac_ath0.txt FOR /F delims^=^"^ tokens^=2 %%G IN ('type mac_ath1.txt') DO (set whitelist=%%G) echo nvram set ath1_maclist^=^"%whitelist% %mac%^">mac_ath1.txt

taigun ali Over a year ago

required for dd-wrt router setting mac adress whitelist, ssh conection, with putty command line script: plink.exe -v -ssh 192.168.1.1 -P 22 -l root -pw password -m mac_ath0.txt

Gary_W · Accepted Answer · 2016-12-02 21:15:20Z

0

How about a powershell script that works on a file in the same folder? Granted it could be more robust but it works as a simple example. I know you asked for a batch file but I am am dabbling in powershell lately. :-/

$NewMac = Read-Host -Prompt 'Add new MAC adress to whitelist'
(get-content .\whitelist.txt) | foreach-object {$_ -replace "`"$", " $NewMac`""}| set-content .\whitelist.txt

answered Dec 2, 2016 at 21:15

Gary_W

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