saving string value to a file

I want to save string variable from .cmd to external file. Just to append it not overwrite it. Something like this

current date/time     string value

Is it possible?
axcxAsked:
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oBdACommented:
Just use the "double" redirection, which will append instead of overwrite: ">>". You can add it before or after the echo ..." command, but I prefer it in front so there are no trailing spaces or the need for brackets:
>>"C:\Temp\echo_date.txt" echo current date/time: %Date% %Time%

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or (with a trailing space at the end of the line):
echo current date/time: %Date% %Time% >>"C:\Temp\echo_date.txt"

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or (no trailing space, but with brackets)
(echo current date/time: %Date% %Time%)>>"C:\Temp\echo_date.txt"

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dlb6597Commented:
echo %time% %string% >>output.txt

where %string% is your variable, output.txt is the file you wish to append to.
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