How to iterate through all the ENV variables printing key and value?

Question

I\'d like to iterate through the variables in env printing:

name: ${name} value: ${value}

Simply splitting by line break and iterating does

Answer 1

Here's the solution from #bash.

unset IFS
args=() i=0
for var in $(compgen -e); do
    printf -v 'args[i++]' -e%s=%s "$var" "${!var}"
done

I initially thought the idea was to output, hence printf %q was necessary, but that's not the case when just building an arguments array, so it can be simplified to this:

unset IFS
args=()
for var in $(compgen -e); do
    args+=( "-e$var=${!var}" )
done

Answer 2

You can use env -0 to get a null terminated list of name=value pairs and use a for loop to iterate:

while IFS='=' read -r -d '' n v; do
    printf "'%s'='%s'\n" "$n" "$v"
done < <(env -0)

Above script use process substitution, which is a BASH feature. On older shells you can use a pipeline:

env -0 | while IFS='=' read -r -d '' n v; do
    printf "'%s'='%s'\n" "$n" "$v"
done