&
separates commands on a line.
&&
executes this command only if previous command’s errorlevel is 0.
||
(not used above) executes this command only if previous command’s errorlevel is NOT 0
>
output to a file
>>
append output to a file
<
input from a file
|
output of one command into the input of another command
^
escapes any of the above, including itself, if needed to be passed to a program
"
parameters with spaces must be enclosed in quotes
+
used with copy
to concatenate files. E.G. copy file1+file2 newfile
,
used with copy
to indicate missing parameters. This updates the files modified date. E.G. copy /b file1,,
%variablename%
an inbuilt or user set environmental variable
!variablename!
a user set environmental variable expanded at execution time, turned with SetLocal EnableDelayedExpansion
command
%<number>
(%1
) the nth command line parameter passed to a batch file. %0
is the batchfile’s name.
%*
(%*
) the entire command line.
%<a letter>
or %%<a letter>
(%A
or %%A
) the variable in a for loop. Single %
sign at command prompt and double %
sign in a batch file.