Bash Shell之declare定义变量

mmdbcn

#!/bin/bash　　echo "Set a custom function - func1"
　　echo
　　func1 ()
　　{
　　echo This is a function.
　　}
　　echo "Lists the function body."
　　echo "============================="
　　declare -f
　　echo
　　echo "Lists the function name."
　　echo "============================="
　　declare -F
　　echo
　　declare -i var1   # var1 is an integer.
　　var1=2367
　　echo "var1 declared as $var1"
　　var1=var1+1       # Integer declaration eliminates the need for 'let'.
　　echo "var1 incremented by 1 is $var1."
　　# Attempt to change variable declared as integer.
　　echo "Attempting to change var1 to floating point value, 2367.1."
　　var1=2367.1       # Results in error message, with no change to variable.
　　echo "var1 is still $var1"
　　echo
　　declare -r var2=13.36         # 'declare' permits setting a variable property
　　#+ and simultaneously assigning it a value.
　　echo "var2 declared as $var2" # Attempt to change readonly variable.
　　echo
　　echo "Change the var2's values to 13.37"
　　var2=13.37                    # Generates error message, and exit from script.
　　echo "var2 is still $var2"    # This line will not execute.
　　exit 0                        # Script will not exit here.