Redirect Standard Error to Standard Output / Redirect Standard Output to Standard Error / Redirect to File

To Redirect Standard Error to Standard Output

command_1 1>&2 | command_2

To Redirect Standard Output to Standard Error

command_1 2>&1 | command_2

To Redirect Standard Output to File

command > filename
OR
command 1> filename

To Redirect Standard Error to File

command 2> filename

To Redirect Standard Output and Standard Error to Separate Files

command 1> filename1 2> filename2

To Redirect Standard Output and Standard Error to Single File

command &> filename