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`echo "export" $((set -o posix ; set)|awk -F "=" 'BEGIN{ORS=" "}1 $1~/[a-zA-Z]/ {print $1}')`

1. First, get all set environment variables: (set -o posix ; set) Reference: https://superuser.com/questions/420295/how-do-i-see-a-list-of-all-currently-defined-environment-variables-in-a-linux-ba

2. Get all environment variable names, separated by space: awk -F "=" 'BEGIN{ORS=" "}1 $1~/[a-zA-Z]/ {print $1}' Reference: awk-Printing column value without new line and adding comma and http://stackoverflow.com/questions/14212993/regular-expression-to-match-a-pattern-inside-awk-command

3. Now, we need to export these variables, but xargs can not do this because it forks child process, export have to be run under current process. echo "export" ... build a command we want, then use `` to run it. That's all :p.