Redirection in linux, directing the standard output and error output together to the file

Redirection in linux: redirects the standard output and error output together to the file in linux, and directs the standard output and error output together to the file, for example, to execute the script in test, redirect the execution result of the script (including standard output and error output) to the output shell code as follows: sh test 1> output 2> & 1 code 1 indicates standard output, 2 indicates the error output. 2> & 1 indicates redirecting error output to standard output