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53a6e9f0bd
* Convert sum command into subcommand of the math command * Add bullet points to math.md documentation
45 lines
1.3 KiB
Markdown
45 lines
1.3 KiB
Markdown
# sum
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This command allows you to calculate the sum of values in a column.
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## Examples
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To get the sum of the file sizes in a directory, simply pipe the size column from the ls command to the sum command.
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```shell
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> ls | get size | math sum
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━━━━━━━━━
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value
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━━━━━━━━━
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51.0 MB
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━━━━━━━━━
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```
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To get the sum of the characters that make up your present working directory.
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```shell
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> pwd | split-row / | size | get chars | math sum
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━━━━━━━━━
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<value>
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━━━━━━━━━
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21
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━━━━━━━━━
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```
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Note that sum only works for integer and byte values. If the shell doesn't recognize the values in a column as one of those types, it will return an error.
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One way to solve this is to convert each row to an integer when possible and then pipe the result to `sum`
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```shell
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> open tests/fixtures/formats/caco3_plastics.csv | get tariff_item | math sum
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error: Unrecognized type in stream: Primitive(String("2509000000"))
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- shell:1:0
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1 | open tests/fixtures/formats/caco3_plastics.csv | get tariff_item | math sum
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| ^^^^ source
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```
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```shell
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> open tests/fixtures/formats/caco3_plastics.csv | get tariff_item | str --to-int | math sum
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━━━━━━━━━━━━━
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<value>
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─────────────
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29154639996
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━━━━━━━━━━━━━
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```
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