8ab2b92405
This adds a top-level document for the new `from` command, with a list of links of all the subcommands. All the from-* subcommands keep their filename, but the content is updated to use the new subcommand syntax. Needs matching update for to* Ref #1709
3.8 KiB
from csv
Converts csv data into table. Use this when nushell cannot determine the input file extension.
Example
Let's say we have the following file :
> cat pets.txt
animal, name, age
cat, Tom, 7
dog, Alfred, 10
chameleon, Linda, 1
pets.txt is actually a .csv file but it has the .txt extension, open is not able to convert it into a table :
> open pets.txt
animal, name, age
cat, Tom, 7
dog, Alfred, 10
chameleon, Linda, 1
To get a table from pets.txt we need to use the from csv command :
> open pets.txt | from csv
━━━┯━━━━━━━━━━━┯━━━━━━━━━┯━━━━━━
# │ animal │ name │ age
───┼───────────┼─────────┼──────
0 │ cat │ Tom │ 7
1 │ dog │ Alfred │ 10
2 │ chameleon │ Linda │ 1
━━━┷━━━━━━━━━━━┷━━━━━━━━━┷━━━━━━
To ignore the csv headers use --headerless :
━━━┯━━━━━━━━━━━┯━━━━━━━━━┯━━━━━━━━━
# │ Column1 │ Column2 │ Column3
───┼───────────┼─────────┼─────────
0 │ dog │ Alfred │ 10
1 │ chameleon │ Linda │ 1
━━━┷━━━━━━━━━━━┷━━━━━━━━━┷━━━━━━━━━
To split on a character other than ',' use --separator :
> open pets.txt
animal; name; age
cat; Tom; 7
dog; Alfred; 10
chameleon; Linda; 1
> open pets.txt | from csv --separator ';'
━━━┯━━━━━━━━━━━┯━━━━━━━━━┯━━━━━━
# │ animal │ name │ age
───┼───────────┼─────────┼──────
0 │ cat │ Tom │ 7
1 │ dog │ Alfred │ 10
2 │ chameleon │ Linda │ 1
━━━┷━━━━━━━━━━━┷━━━━━━━━━┷━━━━━━
To use this command to open a csv with separators other than a comma, use the --raw switch of open to open the csv, otherwise the csv will enter from csv as a table split on commas rather than raw text.
> mv pets.txt pets.csv
> open pets.csv | from csv --separator ';'
error: Expected a string from pipeline
- shell:1:16
1 | open pets.csv | from csv --separator ';'
| ^^^^^^^^ requires string input
- shell:1:0
1 | open pets.csv | from csv --separator ';'
| value originates from here
> open pets.csv --raw | from csv --separator ';'
━━━┯━━━━━━━━━━━┯━━━━━━━━━┯━━━━━━
# │ animal │ name │ age
───┼───────────┼─────────┼──────
0 │ cat │ Tom │ 7
1 │ dog │ Alfred │ 10
2 │ chameleon │ Linda │ 1
━━━┷━━━━━━━━━━━┷━━━━━━━━━┷━━━━━━
The string '\t' can be used to separate on tabs. Note that this is the same as using the from-tsv command.
Newlines '\n' are not acceptable separators.
Note that separators are currently provided as strings and need to be wrapped in quotes.
> open pets.csv --raw | from csv --separator ;
- shell:1:43
1 | open pets.csv --raw | from csv --separator ;
| ^
It is also considered an error to use a separator greater than one char :
> open pets.txt | from csv --separator '123'
error: Expected a single separator char from --separator
- shell:1:37
1 | open pets.txt | from csv --separator '123'
| ^^^^^ requires a single character string input