INTERVIEW QUESTIONS OPERATING SYSTEMS UNIX PROGRAMMING DETAILS

Question: How do I redirect stdout and stderr separately in csh?

Answer: In csh, you can redirect stdout with ">", or stdout and stderr together with ">&" but there is no direct way to redirect stderr only. The best you can do is

( command >stdout_file ) >&stderr_file

which runs "command" in a subshell; stdout is redirected inside the subshell to stdout_file, and both stdout and stderr from the subshell are redirected to stderr_file, but by this point stdout has already been redirected so only stderr actually winds up in stderr_file. If what you want is to avoid redirecting stdout at all, let sh do it for you.

sh -c 'command 2>stderr_file'

In csh, you can redirect stdout with ">", or stdout and stderr together with ">&" but there is no direct way to redirect stderr only. The best you can do is

( command >stdout_file ) >&stderr_file

which runs "command" in a subshell; stdout is redirected inside the subshell to stdout_file, and both stdout and stderr from the subshell are redirected to stderr_file, but by this point stdout has already been redirected so only stderr actually winds up in stderr_file. If what you want is to avoid redirecting stdout at all, let sh do it for you.

sh -c 'command 2>stderr_file'
Source: CoolInterview.com

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