Shell script stop running with background process-CodePudding

I'm trying to run the mysqld in bg to execute some command with the mysql client but my script stop running when I fg my process, here is the script I use

set -m
daemon="/usr/bin/mysqld --user=mysql --console --skip-name-resolve --skip-networking=0 $@"
$daemon &
exec echo "Test"
exec fg %1

I'm not an expert for shell scripting, I check in some website and I found this way to execute my command.

CodePudding user response：

No. The script stop after the exec echo "Test". The exec replaces the current process (the shell script) with the command after it. You can verify this with:

daemon="/usr/bin/mysqld --user=mysql --console --skip-name-resolve --skip-networking=0 $@"
$daemon &
exec echo "Test"
echo "Second Test"
exec fg %1

The solution is simple: don't use exec.

BTW: it is unclear why you would want to do a fg in a shell script. fg has only a function in interactive shells, not in scripts.

CodePudding user response：

Ok Thank you a lot, I found this command to do what i want, and it work

sh /scripts/run.sh & sleep 2 \
        && mysql -utest -ppass mydb < \
        /docker-entrypoint-initdb.d/mydb.sql

For the foreground process I didn't know that fg only work in interactive thank you for your precision.