Self-daemonizing bash script

bash daemon

Here are things I see.

if [[ $1 != "--daemonize" ]]; then

Shouln't that be == --daemonize?

nohup $SCRIPTNAME --daemonize "${PARAMS[@]}" &>/dev/null &

Instead of calling your script again, you could just summon a subshell that's placed in a background:

(    Codes that run in daemon mode.) </dev/null >/dev/null 2>&1 &disown

function daemon_mode {    Codes that run in daemon mode.}daemon_mode </dev/null >/dev/null 2>&1 &disown

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