docs/subshell.md


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# Subshell

* A subshell may be created by any of the following:
    * `(.)`
    * command substitution: `$(.)`, `` `.` ``
    * process substitution: `<(.)`, `>(.)`
        * `bash(1)` does not talk of a subshell here, but this seems to work
          similarly to `$(.)`.