How to return value for a Lua script?

Asked Sep 19 '17 at 01:29

Active Sep 19 '17 at 01:41

Viewed 1,419 times

How can I make my bash return a value for Lua script read function? If I run script from terminal - output is correct but from lua script I got nil value.

lua: action.lua:18: attempt to index local 'findKeyInDB' (a nil value)

 local findKeyInDB = io.open('sh /home/linux/db.sh 15541993')
 local output = findKeyInDB:read("*a")

Bash:

#!/bin/sh
key=$1
myvariable=$(echo "SELECT id,dkey FROM telegram_keys WHERE dkey="$key"" | mysql -N gamdom_database -u root -ppasswrd)
echo "$myvariable"

edited Sep 19 '17 at 01:41

asked Sep 19 '17 at 01:29

Little Fox

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you probably meant to use [io.popen](https://www.lua.org/manual/5.1/manual.html#pdf-io.popen) instead of io.open. See also https://stackoverflow.com/a/5243210/8379597 – jq170727 Sep 19 '17 at 01:42
@jq170727 yes, you are right! – Little Fox Sep 19 '17 at 01:54

How to return value for a Lua script?

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