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GNU grep; cat: { grep -m1 'pattern' && cat || ! cat ./infile } <./infile POSIX sed; cat: { sed -ne'/PATTERN/q;H;1h;$!d;x;p'; cat; } <infile GNU sed; cat: { sed -une'/PATTERN/q;H;1h;$!d;x;p'; cat; } <infile (just add -u) sharing is nice All of the above commands work because the file-descriptor from which they read() is ...

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