2025-03-14 21:59:59 -06:00
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# envsubst
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> Substitutes environment variables with their value in shell format strings.
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> Variables to be replaced should be in either `${var}` or `$var` format.
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2025-12-16 10:20:31 -07:00
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> More information: <https://www.gnu.org/software/gettext/manual/gettext.html#envsubst-Invocation>.
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2025-03-14 21:59:59 -06:00
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- Replace environment variables in `stdin` and output to `stdout`:
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`echo '{{$HOME}}' | envsubst`
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- Replace environment variables in an input file and output to `stdout`:
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`envsubst < {{path/to/input_file}}`
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- Replace environment variables in an input file and output to a file:
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`envsubst < {{path/to/input_file}} > {{path/to/output_file}}`
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- Replace environment variables in an input file from a space-separated list:
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2025-12-16 10:20:31 -07:00
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`envsubst < {{path/to/input_file}} '{{$USER $SHELL $HOME}}'`
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