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並前往https://unix.stackexchange.com/questions/462333/why-does-a-in-bin-sh-a-affect-sed-and-set-a-doesnt

Why does -a in "#!/bin/sh -a" affect sed and "set -a" doesn't?

In your second script: #!/bin/sh set -a echo "a" | sed -e 's/[\d001-\d008]//g'. even though POSIXLY_CORRECT is set in the shell, ...

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