05-27-2017
As has been said before, your request is not at all clear. If you would show us the output produced by command to its standard output and to its standard error and show us the output you are trying to produce, we would have a much better chance of helping you.
If you're saying that you want a bash script that you have named command is to read its own standard error output as part of its input, it might be impossible or it might be trivial depending on what your script is trying to do. If this is the case, we need to see the code in your script; not the way you are currently trying to invoke it. (And, the comments in your script had better be extremely clear about where the feedback loop is and what it is trying to do.)
Note that there is also a standard utility named command. Are you sure that you are invoking your script instead of the standard command utility??? The command utility is a shell built-in in bash, ksh, and many other shells based on Bourne shell syntax.
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RBASH(1) General Commands Manual RBASH(1)
NAME
rbash - restricted bash, see bash(1)
RESTRICTED SHELL
If bash is started with the name rbash, or the -r option is supplied at invocation, the shell becomes restricted. A restricted shell is
used to set up an environment more controlled than the standard shell. It behaves identically to bash with the exception that the follow-
ing are disallowed or not performed:
o changing directories with cd
o setting or unsetting the values of SHELL, PATH, ENV, or BASH_ENV
o specifying command names containing /
o specifying a filename containing a / as an argument to the . builtin command
o specifying a filename containing a slash as an argument to the -p option to the hash builtin command
o importing function definitions from the shell environment at startup
o parsing the value of SHELLOPTS from the shell environment at startup
o redirecting output using the >, >|, <>, >&, &>, and >> redirection operators
o using the exec builtin command to replace the shell with another command
o adding or deleting builtin commands with the -f and -d options to the enable builtin command
o using the enable builtin command to enable disabled shell builtins
o specifying the -p option to the command builtin command
o turning off restricted mode with set +r or set +o restricted.
These restrictions are enforced after any startup files are read.
When a command that is found to be a shell script is executed, rbash turns off any restrictions in the shell spawned to execute the script.
SEE ALSO
bash(1)
GNU Bash-4.0 2004 Apr 20 RBASH(1)