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32 lines
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32 lines
1 KiB
Markdown
# coproc
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> Bash builtin for creating interactive asynchronous subshells.
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> More information: <https://www.gnu.org/software/bash/manual/bash.html#Coprocesses>.
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- Run a subshell asynchronously:
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`coproc { {{command1; command2; ...}}; }`
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- Create a coprocess with a specific name:
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`coproc {{name}} { {{command1; command2; ...}}; }`
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- Write to a specific coprocess `stdin`:
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`echo "{{input}}" >&"${{{name[1]}}}"`
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- Read from a specific coprocess `stdout`:
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`read {{variable}} <&"${{{name[0]}}}"`
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- Create a coprocess which repeatedly reads `stdin` and runs some commands on the input:
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`coproc {{name}} { while read {{line}}; do {{command1; command2; ...}}; done }`
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- Create a coprocess which repeatedly reads `stdin`, runs a pipeline on the input, and writes the output to `stdout`:
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`coproc {{name}} { while read {{line}}; do {{echo "$line"}} | {{command1 | command2 | ...}} | cat /dev/fd/0; done }`
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- Create and use a coprocess running `bc`:
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`coproc BC { bc --mathlib; }; echo "1/3" >&"${BC[1]}"; read output <&"${BC[0]}"; echo "$output"`
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