coproc
The "coproc" command line tool is a built-in command in various Unix-like operating systems, including Bash. It stands for "co-process" and is used to create a two-way communication between a Bash script and a background command. When using the "coproc" command, you can specify a command or a block of commands to run in the background while also creating two special file descriptors for communication: COPROC[0] and COPROC[1]. COPROC[0] is used for reading the output of the background command, while COPROC[1] is used for writing input to it. Here is a basic example of how to use "coproc" in a Bash script: ```bash
!/bin/bash coproc some_command # Run "some_command" in the background and create communication channels # Read the output of the command
while read -r line <&"${COPROC[0]}"; do echo "Output: $line" done # Send input to the command echo "Some input" >&"${COPROC[1]}" # Close the communication channels exec {COPROC[0]}<&- {COPROC[1]}>&-
List of commands for coproc:
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coproc:tldr:0e9c5 coproc: Create a coprocess which repeatedly reads `stdin`, runs a pipeline on the input, and writes the output to `stdout`.$ coproc ${name} {select} | cat /dev/fd/0; done }try on your machineexplain this command
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coproc:tldr:512d8 coproc: Run a subshell asynchronously.$ coproc { ${command1; command2; ---}; }try on your machineexplain this command
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coproc:tldr:938c8 coproc: Create a coprocess which repeatedly reads `stdin` and runs some commands on the input.$ coproc ${name} { while read line; do ${command1; command2; ---}; done }try on your machineexplain this command
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coproc:tldr:d3ee2 coproc: Create and use a coprocess running `bc`.$ coproc BC { bc --mathlib; }; echo "1/3" >&"${BC[1]}"; read output <&"${BC[0]}"; echo "$output"try on your machineexplain this command
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coproc:tldr:de3e5 coproc: Create a coprocess with a specific name.$ coproc ${name} { ${command1; command2; ---}; }try on your machineexplain this command