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A comment on Notes on the M4 Macro Language (2008). Parent comment

Re:Notes on the M4 Macro Language (2008) by vePhi4le on Friday April 03, 2020 @08:08PM (#22775094)
`envsubst` is not POSIX, but my preferred tool for such things: https://linux.die.net/man/1/envsubst

it's part of `gettext`: https://www.gnu.org/software/gettext/manual/html_node/envsub...

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