54 lines
839 B
Bash
54 lines
839 B
Bash
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#!/bin/bash -
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#
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# Use bash in the coprocess but turn off buffering
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#
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process='stdbuf -i0 -o0 -e0 bash'
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#
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# Indexed array of bash commands
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#
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declare -a com=('date +%F' 'whoami' 'id' 'echo "$BASH_VERSION"'
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'printf "Hello\nWorld\n"')
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#
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# Count commands in the array
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#
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n="${#com[@]}"
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#
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# Start the coprocess
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#
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coproc child { $process; }
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#
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# Loop though the commands
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#
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i=0
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while [[ $i -lt $n ]]; do
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# Show the command
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echo "\$ ${com[$i]}"
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# Send to coprocess
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echo "${com[$i]}" >&"${child[1]}"
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# Read a line from the coprocess
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read -u "${child[0]}" -r results
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# Show the line received
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echo "$results"
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((i++))
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done
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#
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# Send an EOF to the coprocess (if needed)
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#
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if [[ -v child_PID ]]; then
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echo "-- End --"
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exec {child[1]}>&-
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# Flush any remaining results
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cat <&"${child[0]}"
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fi
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