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   1 #!/bin/sh
   2
   3 trap "exit 2" USR1
   4
   5 err() {
   6         printf "error: server not detected, needs to be set manually\n" >&2
   7         printf "set \$SERVER or modify the script itself\n" >&2
   8         kill -USR1 "$$"
   9 }
  10
  11 # ... && ... || is not an if-then-else, but this works because
  12 # there's no way for only one printf to fail
  13 [ -z "$SERVER" ] && SERVER=$(which > /dev/null 2>&1 apache2 && printf "apache2" || which > /dev/null 2>&1 nginx && printf "nginx" || err)
  14
  15 { zcat /var/log/"$SERVER"/access.log.*.gz; cat /var/log/"$SERVER"/access.log /var/log/"$SERVER"/access.log.1; } | grep --color=auto -a "$@"