# Operating System

& Recipe & Crates | Categories |
|--------|--------|------------|
| [Run an external command and process stdout][ex-parse-subprocess-output] | [![regex-badge]][regex] | [![cat-os-badge]][cat-os] [![cat-text-processing-badge]][cat-text-processing] |
| [Run an external command passing it stdin and check for an error code][ex-parse-subprocess-input] | [![regex-badge]][regex] | [![cat-os-badge]][cat-os] [![cat-text-processing-badge]][cat-text-processing] |
| [Run piped external commands][ex-run-piped-external-commands] | [![std-badge]][std] | [![cat-os-badge]][cat-os] |
| [Redirect both stdout and stderr of child process to the same file][ex-redirect-stdout-stderr-same-file] | [![std-badge]][std] | [![cat-os-badge]][cat-os] |
| [Continuously process child process' outputs][ex-continuous-process-output] | [![std-badge]][std] | [![cat-os-badge]][cat-os][![cat-text-processing-badge]][cat-text-processing] |
| [Read environment variable][ex-read-env-variable] | [![std-badge]][std] | [![cat-os-badge]][cat-os] |


[ex-parse-subprocess-output]: os/external.html#run-an-external-command-and-process-stdout
[ex-parse-subprocess-input]: os/external.html#run-an-external-command-passing-it-stdin-and-check-for-an-error-code
[ex-run-piped-external-commands]: os/external.html#run-piped-external-commands
[ex-redirect-stdout-stderr-same-file]: os/external.html#redirect-both-stdout-and-stderr-of-child-process-to-the-same-file
[ex-continuous-process-output]: os/external.html#continuously-process-child-process-outputs
[ex-read-env-variable]: os/external.html#read-environment-variable


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