recursion-demo.sh

Shall高级编程

#!/bin/bash
# recursion-demo.sh
# Demonstration of recursion.

RECURSIONS=9   # How many times to recurse.
r_count=0      # Must be global. Why?

recurse ()
{
  var="$1"

  while [ "$var" -ge 0 ]
  do
    echo "Recursion count = "$r_count"  +-+  \$var = "$var""
    (( var-- )); (( r_count++ ))
    recurse "$var"  #  Function calls itself (recurses)
  done              #+ until what condition is met?
}

recurse $RECURSIONS

exit $?