Standard Input - 0
Standard Output - 1
Standard Error - 2
> - Output Redirection
< - Input Redirection
# Send an error when file doesn't exist
ls -l myfile.txt 2> test.txt (/bin/ls: adad: No such file or directory)
2>&1 (redirect input and error) into normal file
ls -l xxx.txt 2>&1 another_file
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