examples/scripts/nohup.bash

   1 #
   2 # BASH VERSION OF nohup COMMAND
   3 #
   4 ctype()
   5 {
   6         path=$(builtin type -p $cmd | sed 1q)
   7         if [ -n "$path" ]; then
   8                 echo "$path"
   9                 return 0
  10         else
  11                 case "$cmd" in
  12                 */*)    [ -x "$cmd ] && { echo "$cmd" ; return 0; } ;;
  13                   *)    case "$(builtin type -t $cmd)" in
  14                         "")     return 1;;
  15                         *)      echo "$cmd" ; return 0;;
  16                         esac ;;
  17                 esac
  18         fi
  19         return 1
  20 }
  21
  22 trap '' HUP             # ignore hangup
  23 command=$(ctype "$1")
  24 oldmask=$(umask)
  25 umask u=rw,og=          # default mode for nohup.out
  26 exec 0< /dev/null       # disconnect input
  27 if [ -t 1 ]; then       # redirect output if necessary
  28         if [ -w . ]; then
  29                 echo 'Sending output to nohup.out'
  30                 exec >> nohup.out
  31         else    echo "Sending output to $HOME/nohup.out"
  32                 exec >> $HOME/nohup.out
  33         fi
  34 fi
  35
  36 umask "$oldmask"
  37
  38 # direct unit 2 to a file
  39 if [ -t 2 ]; then
  40         exec 2>&1
  41 fi
  42
  43 # run the command
  44 case $command in
  45 */*)    exec "$@"
  46         ;;
  47 time)   eval "$@"
  48         ;;
  49 *)      "$@"
  50         ;;
  51 esac