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並前往https://www.linuxquestions.org/questions/programming-9/how-to-make-awk-do-%2Asomething%2A-without-giving-it-any-stdin-nor-inputfile-can-it-be-done-837233/

[SOLVED] ? How to make AWK do *something* without giving ...

(wondering how this differs from a pipe into stdin?): awk ... awk 'BEGIN { while ((getline line < system("df") > 0)) { print $1 }; exit}'

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