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perl -h is useful -e program: one line of program (several -e's allowed, omit programfile) -p: assume loop like -n but print line also, like sed


I don't think it'd be common to interpret tool -f BAR | --foo BAR as «pipe the output of tool -f BAR into the command --foo BAR». So I'd use simply tool -f BAR | --foo BAR There's other possibilities in the wild using additional markup, specially if the invocation is more complex, to make it more obvious. Unlike with optional arguments and [] though, none ...

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