使用jq导出带有空格的环境变量

Question

So, I'm trying to export an environment variable that comes from an api that returns json values. Would like to use jq to just do a one liner, but if the values have spaces I cannot get it working

Trying without surrounding the value in quotes

/app/src $ $(echo '{"params":[{ "Name":"KEY","Value":"value with space"}]}' | jq
 -r '.params[] | "export " + .Name + "=" + .Value')
/app/src $ printenv KEY
value
/app/src $ 

Next, I try wrapping the value in quotes

/app/src $ $(echo '{"params":[{ "Name":"KEY","Value":"value with space"}]}' | jq
 -r '.params[] | "export " + .Name + "=\"" + .Value + "\""')
sh: export: space": bad variable name
/app/src $ 

Answer 1

For all of the below, I'm assuming that:

json='{"params":[{ "Name":"KEY","Value":"value with space"}]}'

---

It can be done with eval , but ONLY IF YOU TRUST YOUR INPUT .

This might look like:

eval "$(jq -r '.params[] | "export \(.Name | @sh)=\(.Value | @sh)"' <<<"$json")"

The @sh builtin in jq escapes content to be eval -safe in bash, and the eval invocation then ensures that the content goes through all parsing stages (so literal quotes in the data emitted by jq become syntactic).

---

Better form is to generate a NUL-delimited key/value list...

build_kv_nsv() {
  jq -j '.params[] |
    ((.Name | gsub("\u0000"; "")),
     "\u0000",
     (.Value | gsub("\u0000"; "")),
     "\u0000")'
}

...and either populate an associative array...

declare -A content_received=( )
while IFS= read -r -d '' name && IFS= read -r -d '' value; do
  content_received[$name]=$value
done < <(build_kv_nsv <<<"$json")

# print the value of the populated associative array
declare -p content_received

...or to use a namespace that's prefixed to guarantee safety.

while IFS= read -r -d '' name && IFS= read -r -d '' value; do
  printf -v "received_$name" %s "$value" && export "received_$name"
done < <(build_kv_nsv <<<"$json")

# print names and values of our variables that start with received_
declare -p "${!received_@}" >&2

Answer 2

If the values are known not to contain (raw) newlines, and if you have access to mapfile , it may be worthwhile considering using it, eg

$ json='{"params":[{ "Name":"KEY","Value":"value with space"}]}'
$ mapfile -t KEY < <( jq -r '.params[] | .Value' <<< "$json" )
$ echo N=${#KEY[@]}
N=1

If the values might contain (raw) newlines, then you'd need a version of mapfile with the -d option, which could be used as illustrated below:

$ json='{"params":[{ "Name":"KEY1","Value":"value with space"}, { "Name":"KEY2","Value":"value with \n newline"}]}'
$ mapfile -d $'\0' KEY < <( jq -r -j '.params[] | .Value + "\u0000"' <<< "$json" )
$ echo N=${#KEY[@]}
N=2