Time for action – listing the options

Like a lot of other Linux programs, Squid also provides the option -h which can be used to retrieve a list of options:

squid -h

The previous command will result in the following output:

Usage: squid [-cdhvzCFNRVYX] [-s | -l facility] [-f config-file] [-[au] port] [-k signal]
   -a port   Specify HTTP port number (default: 3128).
   -d level  Write debugging to stderr also.
   -f file   Use given config-file instead of
             /opt/squid/etc/squid.conf.
   -h  Print help message.
   -k  reconfigure|rotate|shutdown|interrupt|kill|debug|check|parse
           Parse configuration file, then send signal to 
           running copy (except -k parse) and exit.
   -s | -l facility
           Enable logging to syslog.
   -u  port Specify ICP port number (default: 3130), disable with 0.
   -v  Print version.
   -z  Create swap directories.
   -C  Do not catch fatal signals.
   -F  Don't serve any requests until store is rebuilt.
   -N  No daemon mode.
  ...