How To Redirect stderr To stdout ( redirect stderr to a File )

3 default standard files (standard streams) open:[a] stdin - Use to get input (keyboard) i.e. data going into a program.
[b] stdout - Use to write information (screen)
[c] stderr - Use to write error message (screen)
Understanding I/O streams numbers
The Unix / Linux standard I/O streams with numbers:
Handle
Name
Description
0
stdin
Standard input
1
stdout
Standard output
2
stderr
Standard error
Redirecting the standard error stream to a file
The following will redirect program error message to a file called error.log: $ program-name 2> error.log
$ command1 2> error.log

Redirecting the standard error (stderr) and stdout to file
Use the following syntax: $ command-name &>file OR $ command > file-name 2>&1 Another useful example: # find /usr/home -name .profile 2>&1 | more
Redirect stderr to stdout
Use the command as follows: $ command-name 2>&1

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