ex62.sh

Shall高级编程

#!/bin/bash
# Global and local variables inside a function.

func ()
{
  local loc_var=23       # Declared as local variable.
  echo                   # Uses the 'local' builtin.
  echo "\"loc_var\" in function = $loc_var"
  global_var=999         # Not declared as local.
                         # Defaults to global. 
  echo "\"global_var\" in function = $global_var"
}  

func

# Now, to see if local variable "loc_var" exists outside function.

echo
echo "\"loc_var\" outside function = $loc_var"
                                      # $loc_var outside function = 
                                      # No, $loc_var not visible globally.
echo "\"global_var\" outside function = $global_var"
                                      # $global_var outside function = 999
                                      # $global_var is visible globally.
echo				      

exit 0
#  In contrast to C, a Bash variable declared inside a function
#+ is local *only* if declared as such.