62 lines
1.8 KiB
Markdown
62 lines
1.8 KiB
Markdown
# envfilesubst
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envfilesubst is a variation of gettext's envsubst, with a different modus
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operandi.
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Firstly, instead of reading the current environment, it instead parses a file
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in "envfile" format.
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Secondly, it will read from standard input and replace all variable references
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that can be found in the envfile. If variables are not explicitly mentioned in
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the envfile, the references will be left intact (instead of replacing them with
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an empty string).
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## Installation
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```
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go install git.netflux.io/rob/envfilesubst@latest
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```
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## Usage
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Given an envfile:
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```
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FOO=bar
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X=1
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```
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Then:
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```
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echo "FOO is $FOO and X is ${X}. I don't know $BAR." | envfilesubst -f myenvfile
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```
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The output is:
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```
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FOO is bar and X is 1. I don't know $BAR.
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```
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## License
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Copyright © 2022 Rob Watson.
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Permission is hereby granted, free of charge, to any person obtaining a copy of
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this software and associated documentation files (the “Software”), to deal in
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the Software without restriction, including without limitation the rights to
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use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies
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of the Software, and to permit persons to whom the Software is furnished to do
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so, subject to the following conditions:
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The above copyright notice and this permission notice shall be included in all
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copies or substantial portions of the Software.
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THE SOFTWARE IS PROVIDED “AS IS”, WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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SOFTWARE.
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