Read file in bash script with loop

Question

Given file socat.conf

AUTOSTART=default

SOCAT_default="TCP4-LISTEN:3724,nodelay,fork,reuseaddr,su=nobody TCP4:your.wow.server.ip.address:3724,nodelay"

The relevant part of the bash script that reads this file:

[ ! -f /etc/default/socat.conf ] || . /etc/default/socat.conf

start () {
    echo "Starting $DESC:"
        maxfds
        umask 027
        cd /tmp
        if test "x$AUTOSTART" = "xnone" -o -z "x$AUTOSTART" ; then
                echo "Autostart disabled."
                exit 0
        fi
        for NAME in $AUTOSTART ; do
                ARGS=`eval echo \\\$SOCAT_$NAME`
                echo $ARGS
                start_socat
                echo " $NAME $ARGS"
        done
        return $?
}

For the full file see here: https://blog.bentrax.de/2009/08/26/socat-start-automatisieren-und-iptables-regeln-laden/

My question is, how can I add another command to socat.conf? I tried with

AUTOSTART=default,another

SOCAT_default="TCP4-LISTEN:3724,nodelay,fork,reuseaddr,su=nobody TCP4:your.wow.server.ip.address:3724,nodelay"

SOCAT_another="..."

However this did not work. I am not very familiar with bash scripts to understand the for NAME in $AUTOSTART loop. I think the answer lays there. Any ideas?

Is that an issue with multiple start_socat calls? The conf/args seem to get read correctly: ideone.com/qP8aQH — Josh Jolly
– Josh Jolly, Commented Apr 13, 2014 at 20:39
@JoshJolly solved, AUTOSTART="..", I was missing the ". Post your code as an answer... — DarkLeafyGreen
– DarkLeafyGreen, Commented Apr 13, 2014 at 20:51

Josh Jolly · Accepted Answer · 2014-04-13 20:55:25Z

1

The for NAME in $AUTOSTART works by splitting $AUTOSTART into words using the environmental variable $IFS as delimiters (default is space, tab and newline). Each word in turn is then stored in $NAME and processed within the loop until no words remain.

The solution to your problem, then, is to separate your words using spaces (or tabs, or newlines..):

AUTOSTART="default another"

The double quotes are necessary, otherwise it will be read as two separate commands, AUTOSTART=default and another (again because of word-splitting using IFS).

answered Apr 13, 2014 at 20:55

Josh Jolly

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