Fish

fish shell:通過管道或讀取將多行輸出擷取到變數

  • August 15, 2020

如果你

curl https://www.toptal.com/developers/gitignore/api/python

您按預期看到文件,帶有換行符。但如果我

set response (curl https://www.toptal.com/developers/gitignore/api/python)
echo $response

在魚中,換行符消失了。我看過魚read,但是

url $gitignoreurlbase/python | read response # I have also tried read -d 'blah'
echo $response

只是顯示一個空白。

如何擷取多行輸出?

替換set var (command)set var (command | string split0)

解釋:

預設情況下,命令替換在換行符上拆分。$response 變數是輸出的行列表。這是記錄在案的

$ set var (seq 10)
$ set --show var
$var: not set in local scope
$var: set in global scope, unexported, with 10 elements
$var[1]: length=1 value=|1|
$var[2]: length=1 value=|2|
$var[3]: length=1 value=|3|
$var[4]: length=1 value=|4|
$var[5]: length=1 value=|5|
$var[6]: length=1 value=|6|
$var[7]: length=1 value=|7|
$var[8]: length=1 value=|8|
$var[9]: length=1 value=|9|
$var[10]: length=2 value=|10|
$var: not set in universal scope

幸運的是,補救措施也是如此

$ set var (seq 10 | string split0)
$ set -S var
$var: not set in local scope
$var: set in global scope, unexported, with 1 elements
$var[1]: length=21 value=|1\n2\n3\n4\n5\n6\n7\n8\n9\n10\n|
$var: not set in universal scope

# OR
$ set oldIFS $IFS
$ set --erase IFS
$ set var (seq 10)
$ set -S var
$var: not set in local scope
$var: set in global scope, unexported, with 1 elements
$var[1]: length=20 value=|1\n2\n3\n4\n5\n6\n7\n8\n9\n10|
$var: not set in universal scope
$ set IFS $oldIFS

請注意與string split0保留尾隨換行符的區別。

如果您可以將 $response 作為行列表,但您只想正確顯示它:

printf "%s\n" $response

# or, with just a literal newline as the join string
string join "
" $respose

引用自:https://unix.stackexchange.com/questions/603986