英文:
Insert dash into the output of jq at specific positions
问题
You can modify your jq code like this to change the date format:
echo '{ "date":"20200101" }{ "date":"20210101" }' | jq -r '"The bus will be here on \(.date | strptime("%Y%m%d") | strftime("%Y-%m-%d")), at ten o clock"'
This code uses strptime to parse the input date in the format "20200101" and then strftime to format it as "2020-01-01" in the output.
英文:
How do I modify the jq code in:
echo '{"date":"20200101"}{"date":"20210101"}' | jq -r '"The bus will be here on \( .date ), at ten o clock"'
to change the format of the date from eg 20200101 into 2020-01-01?
I get the output:
The bus will be here on 20200101, at ten o clock
The bus will be here on 20210101, at ten o clock
I want the output:
The bus will be here on 2020-01-01, at ten o clock
The bus will be here on 2021-01-01, at ten o clock
I tried:
echo '{"date":"20200101"}{"date":"20210101"}' | jq -r '"The bus will be here on \( .date | strftime("%Y-%m-%d") ), at ten o clock"'
but that tells me:
jq: error (at <stdin>:1): strftime/1 requires parsed datetime inputs
strftime apparently needs the input date to be in another format.
答案1
得分: 2
根据文档，strftime 的格式如下：
strptime和strftime的格式字符串在典型的 C 库文档中有描述。ISO 8601 日期时间的格式字符串为 "%Y-%m-%dT%H:%M:%SZ"。
这就是为什么您的表达式出现错误，因为输入与所需格式不匹配。
在这种情况下，您应该简单地切分字符串：
echo '{ "date":"20200101"}{ "date":"20210101"}' | jq -r '"The bus will be here on \( .date | .[0:4] + "-" + .[4:6] + "-" + .[6:8] ), at ten o clock"'
英文:
According to the docs, the format for strftime is:
> The format strings for strptime and strftime are described in typical C library documentation. The format string for ISO 8601 datetime is "%Y-%m-%dT%H:%M:%SZ".
which is why your expression errors, since the input does not match the required format.
In this case, you should simply slice the string:
echo '{"date":"20200101"}{"date":"20210101"}' | jq -r '"The bus will be here on \( .date | .[0:4] + "-" + .[4:6] + "-" + .[6:8] ), at ten o clock"'
答案2
得分: 2
你还可以使用strptime首先解析%Y%m%d格式的日期，然后使用strftime重新格式化它，例如%F：
… | jq -r '"The bus will be here on \(.date | strptime("%Y%m%d") | strftime("%F")), at ten o clock"'
The bus will be here on 2020-01-01, at ten o clock
The bus will be here on 2021-01-01, at ten o clock
英文:
You can also use strptime to first parse the %Y%m%d-formatted date, then re-format it with strftime to, for example, %F:
… | jq -r '"The bus will be here on \(.date | strptime("%Y%m%d") | strftime("%F")), at ten o clock"'
The bus will be here on 2020-01-01, at ten o clock
The bus will be here on 2021-01-01, at ten o clock
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