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command > filename Redirect command output to a file command >> filename APPEND into a file command < filename Type a text file and pass the text to command commandA | commandB Pipe the output from commandA into commandB command & command Perform the first command & then perform the second command 2> filename Redirect any error message into a file (command) 2> filename Redirect any CMD.exe error into a file command > file 2>&1 Redirect output and errors to one file command > fileA 2> fileB Redirect output and errors to separate files command 2>&1 >filename This will fail! Redirect to NUL (hide errors) command 2> nul Redirect error messages to NUL command >nul 2>&1 Redirect error and information messages to NUL command >filename 2> nul Redirect info to file but suppress error (command) >filename 2> nul Redirect info to file but suppress CMD.exe errors
Note, any long filenames must be surrounded in "double quotes". A CMD error is an error raised by the command processor itself rather than the program/command.
Redirection with > or 2> will overwrite any existing file.
You can also redirect to a printer with > PRN or >LPT1
To prevent any of the above characters from causing redirection prefix with a caret ^
Examples of redirection:
DIR >MyFileListing.txt DIR /o:n >"Another list of Files.txt" ECHO y| DEL *.txt ECHO Some text ^<html tag^> more text MEM /C >>MemLog.txt Date /T >>MemLog.txt SORT < MyTextFile.txt SET _output=%_missing% 2>nul DIR C:\ >List_of_C.txt 2>errorlog.txt FIND /i "Jones" < names.txt >logfile.txt DIR C:\ >List_of_C.txt & DIR D:\ >List_of_D.txt ECHO DIR C:\ ^> c:\logfile.txt >NewScript.cmd (TYPE logfile.txt >> newfile.txt) 2>nul
"Change is good. You go first" - Scott Adams (Dilbert)
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