I am new to bash-programming, sorry if this might be a kind of stupid question. I found a script on my server and i am trying to understand every line:
#!/bin/sh # # man-db cron weekly set -e if ! [ -d /var/cache/man ]; then # Recover from deletion, per FHS. mkdir -p /var/cache/man chown man:root /var/cache/man || true chmod 2755 /var/cache/man fi # regenerate man database if [ -x /usr/bin/mandb ]; then # --pidfile /dev/null so it always starts; mandb isn't really a daemon, # but we want to start it like one. start-stop-daemon --start --pidfile /dev/null \ --startas /usr/bin/mandb --oknodo --chuid man \ -- --quiet fi exit 0
Some things i don't understand like
I read about it, that it "checks" your commands. So it gives warnings or an exception if something goes wrong? Or a more detailed error-report?
if ! [ -d /var/cache/man ]; then OR if [ -x /usr/bin/mandb ]; then
What i don't understand are the "-d" or "-x" commands at the if clause, imho there is something missing there.
chown man:root /var/cache/man || true
I don't understand the last part, what's the reason for this "OR TRUE".
Maybe somebody can help me?
tia && regards noircc