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| aa_config | Package config |
| eval_fork | Safe Evaluation |
| eval_safe | Safe Evaluation |
| exec | Running System Commands |
| exec_background | Running System Commands |
| exec_internal | Running System Commands |
| exec_r | Execute R from R |
| exec_status | Running System Commands |
| exec_wait | Running System Commands |
| quote | Quote arguments on Windows |
| r_background | Execute R from R |
| r_internal | Execute R from R |
| r_wait | Execute R from R |
| sys | Running System Commands |
| sys_config | Package config |
| windows_quote | Quote arguments on Windows |