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#!/bin/bash # Script: greet.sh # Usage: ./greet.sh <name> <city> # --- Script metadata --- SCRIPT_NAME=$0 ARG_COUNT=$# echo "Script: $SCRIPT_NAME" echo "Arguments received: $ARG_COUNT" # --- Positional parameters --- NAME=$1 CITY=${2:-"Unknown City"} # Default value if $2 is empty echo "Hello, $NAME! You are from $CITY." # --- All arguments --- echo "All args: $@" for arg in "$@"; do echo " Arg: $arg" done # --- Variable assignment and expansion --- GREETING="Welcome" FULL_MSG="${GREETING}, ${NAME}!" echo "$FULL_MSG" # --- Exit status --- ls /nonexistent 2>/dev/null echo "Exit status of last command: $?" ls /tmp 2>/dev/null echo "Exit status: $?" # 0 = success # --- Current shell PID --- echo "This script's PID: $$" # --- Read-only variable --- readonly MAX_RETRIES=3 echo "Max retries: $MAX_RETRIES" # --- Unset a variable --- TEMP_VAR="temporary" unset TEMP_VAR echo "TEMP_VAR is now: '${TEMP_VAR}'"
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