LDP/LDP/guide/docbook/abs-guide/func-cmdlinearg.sh

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#!/bin/bash
# func-cmdlinearg.sh
# Call this script with a command-line argument,
#+ something like $0 arg1.
func ()
{
echo "$1" # Echoes first arg passed to the function.
} # Does a command-line arg qualify?
echo "First call to function: no arg passed."
echo "See if command-line arg is seen."
func
# No! Command-line arg not seen.
echo "============================================================"
echo
echo "Second call to function: command-line arg passed explicitly."
func $1
# Now it's seen!
exit 0