bash_n_examples/bash/fd/err_log_debug_info3.sh

   1 #!/bin/bash
   2
   3 log() {
   4     echo $* >&3
   5 }
   6 info() {
   7     echo $* >&4
   8 }
   9 err() {
  10     echo $* >&2
  11 }
  12 debug() {
  13     echo $* >&5
  14 }
  15
  16 VERBOSE=1
  17
  18 while [[ $# -gt 0 ]]; do
  19     ARG=$1
  20     shift
  21     case $ARG in
  22         "-vv")
  23             VERBOSE=3
  24         ;;
  25         "-v")
  26             VERBOSE=2
  27         ;;
  28         "-q")
  29             VERBOSE=0
  30         ;;
  31         # More flags
  32         *)
  33         echo -n
  34         # Linear args
  35         ;;
  36     esac
  37 done
  38
  39 for i in 1 2 3; do
  40     fd=$(expr 2 + $i)
  41     if [[ $VERBOSE -ge $i ]]; then
  42         eval "exec $fd>&1"
  43     else
  44         eval "exec $fd> /dev/null"
  45     fi
  46 done
  47
  48 err "This will _always_ show up."
  49 log "This is normally displayed, but can be prevented with -q"
  50 info "This will only show up if -v is passed"
  51 debug "This will show up for -vv"