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BASH: redirection

A bit 'of examples of redirection in BASH.
Standard input = 0.
Standard output = 1 (all that is printed with printf in C, and court in C + +).
Standard error = 2 (all that is printed with perror in C, and cerr in C + +).

Redirect the output of a program in a file (if it exists, the contents are overwritten).

 cmd> filename 

 cmd 1> filename Redirect 

the error of a program in a file (if it exists, the contents are overwritten).

 cmd 2> filename 

Redirect the output of a program in a file (if it exists, the new text is added in append mode, at the end of the file).

 cmd>> filename 

 cmd 1>> filename 

Redirect the error of a program in a file (if it exists, the new text is added in append mode, at the end of the file).

 cmd 2>> filename 

Redirect the output is that the error a program in a file.

 cmd &> filename 

Redirect the output of a program in error.

 cmd> & 2 

 cmd 1> & 2 Redirect 

the error in a program's output.

 cmd 2> & 1