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==Redirecting to and from the standard file handles==
In [[Unix shell]]s derived from the original [[Bourne shell]], the first two actions can be further modified by placing a number (the [[file descriptor]]) immediately before the [[token (parser)|character]]; this will affect which stream is used for the redirection.<ref>https://www.redhat.com/sysadmin/redirect-shell-command-script-output</ref> The Unix standard I/O streams are:<ref>https://www.gnu.org/software/bash/manual/html_node/Redirections.html</ref>
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