151 lines
3.5 KiB
Bash
Executable File
151 lines
3.5 KiB
Bash
Executable File
#!/usr/bin/ksh
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#
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# AUTHOR: Randy Micahel
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# SCRIPT: random_number.ksh
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# DATE: 11/12/2007
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# REV: 1.2.P
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#
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# PLATFORM: Not Platform Dependent
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#
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# EXIT CODES:
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# 0 - Normal script execution
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# 1 - Usage error
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#
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# REV LIST:
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#
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#
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# set -x # Uncomment to debug
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# set -n # Uncomment to check syntax without any command execution
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#
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####################################################
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########## DEFINE FUNCTIONS HERE ###################
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####################################################
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function usage
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{
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echo "\nUSAGE: $SCRIPT_NAME [-f] [upper_number_range]"
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echo "\nEXAMPLE: $SCRIPT_NAME"
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echo "Will return a random number between 0 and 32767"
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echo "\nEXAMPLE: $SCRIPT_NAME 1000"
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echo "Will return a random number between 1 and 1000"
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echo "\nEXAMPLE: $SCRIPT_NAME -f 1000"
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echo "Will add leading zeros to a random number from"
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echo "1 to 1000, which keeps the number of digits consistant\n"
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}
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####################################################
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function get_random_number
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{
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# This function gets the next random number from the
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# $RANDOM variable. The range is 0 to 32767.
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echo "$RANDOM"
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}
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####################################################
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function in_range_random_number
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{
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# Create a pseudo-random number less than or equal
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# to the $UPPER_LIMIT value, which is user defined
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RANDOM_NUMBER=$(($RANDOM % $UPPER_LIMIT + 1))
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echo "$RANDOM_NUMBER"
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}
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####################################################
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function in_range_fixed_length_random_number_typeset
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{
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# Create a pseudo-random number less than or equal
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# to the $UPPER_LIMIT value, which is user defined.
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# This function will also pad the output with leading
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# zeros to keep the number of digits consistent using
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# the typeset command.
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# Find the length of each character string
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UL_LENGTH=$(echo ${#UPPER_LIMIT})
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# Fix the length of the RANDOM_NUMBER variable to
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# the length of the UPPER_LIMIT variable, specified
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# by the $UL_LENGTH variable.
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typeset -Z$UL_LENGTH RANDOM_NUMBER
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# Create a fixed length pseudo-random number
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RANDOM_NUMBER=$(($RANDOM % $UPPER_LIMIT + 1))
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# Return the value of the fixed length $RANDOM_NUMBER
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echo $RANDOM_NUMBER
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}
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####################################################
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############## BEGINNING OF MAIN ###################
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####################################################
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SCRIPT_NAME=`basename $0`
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RANDOM=$$ # Initialize the RANDOM environment variable
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# using the PID as the initial seed
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case $# in
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0) get_random_number
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;;
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1) UPPER_LIMIT="$1"
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# Test to see if $UPPER_LIMIT is a number
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case $UPPER_LIMIT in
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+([0-9])) : # Do Nothing...It's a number
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# NOTE: A colon (:) is a no-op in Korn shell
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;;
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*) echo "\nERROR: $UPPER_LIMIT is not a number..."
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usage
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exit 1
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;;
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esac
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in_range_random_number
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;;
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2) # Check for the -f switch to fix the length.
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if [[ $1 = '-f' ]] || [[ $1 = '-F' ]]
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then
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UPPER_LIMIT="$2"
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# Test to see if $UPPER_LIMIT is a number
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case $UPPER_LIMIT in
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+([0-9])) : # Do Nothing...It's a number
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# NOTE: A colon (:) is a no-op in Korn shell
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;;
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*) echo "\nERROR: $UPPER_LIMIT is not a number..."
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usage
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exit 1
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;;
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esac
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in_range_fixed_length_random_number_typeset
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else
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echo "\nInvalid argument $1, see usage below..."
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usage
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exit 1
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fi
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;;
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*) usage
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exit 1
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;;
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esac
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# End of random_number.ksh Shell Script
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