'Behavior of using a combination of Input and Error redirection in UNIX
I am new to UNIX scripting and learning about input, output, and error redirection in UNIX.
I understand that there is no restriction/dependency in the sequence of using the different types of redirection.
e.g. cat < foo > bar is the same as> bar cat < foo
However, when I use the combination with an error redirection, I find that there is a dependency on the sequence of the redirection.
In my case, the file foo1 does not exist
So if I run cat < foo1 2> bar,
I get the error message output on the terminal
-bash: foo1: No such file or directory
Based on what I have understood, I expect the error message to be copied to the bar file.
However, when I run 2>bar cat < foo1, the error message is copied to the bar file.
So my question is: Does the sequence of redirection matter, when we are using combination of different types of redirection?
Why is the behavior different when I use error redirection, compared to input and output redirection?
Sources
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