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91 lines
5.3 KiB
Markdown
91 lines
5.3 KiB
Markdown
# where
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This command filters the content of a table based on a condition passed as a parameter, which must be a boolean expression making use of any of the table columns. Other commands such as `ls` are capable of feeding `where` with their output through pipelines.
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Where has two general forms:
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- `where <column_name> <comparison> <value>`
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- `where <column_name>`
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## Where with comparison
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In the first form, `where` is passed a column name that the filter will run against. Next, is the operator used to compare this column to its value. The following operators are supported:
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- `<` (less than)
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- `<=` (less than or equal)
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- `>` (greater than)
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- `>=` (greater than or equal)
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- `!=` (not equal)
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- `==` (equal)
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Strings have two additional operators:
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- `=~` (fuzzy match to allow)
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- `!~` (fuzzy match to not allow)
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Dates can also be compared using the duration types. For example, `where accessed > 2w` will check the date in accessed to see if it's greater than 2 weeks ago. Durations currently allow these abbreviations:
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- `1s` (one second)
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- `1m` (one minute)
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- `1h` (one hour)
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- `1d` (one day)
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- `1w` (one week)
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- `1M` (one month)
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- `1y` (one year)
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## Boolean check
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Where with the form `| where readonly` is used to check boolean values. For example, the command `ls --full | where readonly` will list only those files that are readonly.
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## Usage
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```shell
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> [input-command] | where [condition]
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```
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## Examples
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```shell
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> ls | where size > 4kb
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━━━┯━━━━━━━━━━━━┯━━━━━━┯━━━━━━━━━┯━━━━━━━━━━━━━┯━━━━━━━━━━━━━┯━━━━━━━━━━━━━
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# │ name │ type │ size │ created │ accessed │ modified
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───┼────────────┼──────┼─────────┼─────────────┼─────────────┼─────────────
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0 │ Cargo.lock │ File │ 87.2 KB │ 7 hours ago │ 7 hours ago │ 7 hours ago
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1 │ README.md │ File │ 19.5 KB │ 7 hours ago │ 7 hours ago │ 7 hours ago
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2 │ Cargo.toml │ File │ 4.7 KB │ 7 hours ago │ 7 hours ago │ 7 hours ago
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━━━┷━━━━━━━━━━━━┷━━━━━━┷━━━━━━━━━┷━━━━━━━━━━━━━┷━━━━━━━━━━━━━┷━━━━━━━━━━━━━
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```
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```shell
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> ps | where cpu > 0
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━━━┯━━━━━━━┯━━━━━━━━━━━━━━━━━━━━━━━┯━━━━━━━━━━┯━━━━━━━━━━━━━━━━━━━
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# │ pid │ name │ status │ cpu
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───┼───────┼───────────────────────┼──────────┼───────────────────
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0 │ 1546 │ Xorg │ Sleeping │ 10.65405000000000
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1 │ 1769 │ gnome-shell │ Sleeping │ 5.271094000000000
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2 │ 2153 │ gnome-terminal-server │ Sleeping │ 5.193664000000000
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3 │ 13556 │ nu_plugin_ps │ Sleeping │ 40.70250000000000
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━━━┷━━━━━━━┷━━━━━━━━━━━━━━━━━━━━━━━┷━━━━━━━━━━┷━━━━━━━━━━━━━━━━━━━
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```
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```shell
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> ls | where accessed <= 1w
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━━━┯━━━━━━━━━━━━━━━┯━━━━━━━━━━━┯━━━━━━━━━━┯━━━━━━━━━━━━┯━━━━━━━━━━━━
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# │ name │ type │ size │ accessed │ modified
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───┼───────────────┼───────────┼──────────┼────────────┼────────────
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0 │ Cargo.toml │ File │ 4.7 KB │ 2 days ago │ 2 days ago
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1 │ target │ Directory │ 4.1 KB │ 2 days ago │ 2 days ago
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2 │ Makefile.toml │ File │ 449 B │ 4 days ago │ 4 days ago
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3 │ README.md │ File │ 19.5 KB │ 2 days ago │ 2 days ago
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4 │ Cargo.lock │ File │ 170.7 KB │ 2 days ago │ 2 days ago
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5 │ crates │ Directory │ 4.1 KB │ 2 days ago │ 2 days ago
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6 │ TODO.md │ File │ 1.3 KB │ 2 days ago │ 2 days ago
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━━━┷━━━━━━━━━━━━━━━┷━━━━━━━━━━━┷━━━━━━━━━━┷━━━━━━━━━━━━┷━━━━━━━━━━━━
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```
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```shell
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> ls | where name =~ "yml"
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━━━━━━━━━━━━━┯━━━━━━┯━━━━━━━┯━━━━━━━━━━━━┯━━━━━━━━━━━━
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name │ type │ size │ accessed │ modified
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─────────────┼──────┼───────┼────────────┼────────────
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.gitpod.yml │ File │ 780 B │ a week ago │ a week ago
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━━━━━━━━━━━━━┷━━━━━━┷━━━━━━━┷━━━━━━━━━━━━┷━━━━━━━━━━━━
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```
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