Shellscriptのひな型

code:bash

set -euo pipefail # Stop on errors, undefined variables, and errors in pipelines

set -o errtrace # Inherit ERR trap in functions and subshells

# ==========================================================

# Default Configuration

# ==========================================================

LOG_LEVEL="INFO"

LOG_FILE="/tmp/$(basename "${0%.sh}.log")"

# ==========================================================

# Command-line argument parsing

# ==========================================================

function usage() {

cat <<EOL

Options:

-h, --help Show this help message and exit.

-L, --log-level Set log level (DEBUG, INFO, WARN, ERROR). Default: INFO.

-l, --log-file Set log file path. Default: logs to stdout.

EOL

}

function parse_args() {

case "$1" in

-h|--help) usage; exit 0;;

-l|--log-file) LOG_FILE=$2; shift;;

-L|--log-level) LOG_LEVEL=$2; shift;;

*) echo "Invalid argument: $1"; usage; exit 1;;

esac

shift

done

log_debug "Log level set to $LOG_LEVEL"

log_debug "Log file set to ${LOG_FILE:-stdout}"

}

# ==========================================================

# Logging functions

# =========================================================

declare -A LOG_COLORS=(

)

RESET="\033[0m"

function log() {

local level=$1

shift

local levels=("DEBUG" "INFO" "WARN" "ERROR")

fi

}

# Convenience functions for each log level

function log_debug() { log "DEBUG" "$@"; }

function log_info() { log "INFO" "$@"; }

function log_warn() { log "WARN" "$@"; }

function log_error() { log "ERROR" "$@"; }

# ==========================================================

# Implementation

# =========================================================

SHOULD_KEEP_RUN=true

COUNT=0

function main() {

log_info "Start!"

COUNT=$((COUNT + 1))

sleep 1;

log_debug "Sleeping 1 second... Count: ${COUNT}";

done

log_info "Finished!"

}

function sig_handler() {

SHOULD_KEEP_RUN=false

}

function cleanup() {

local rc=$?

set +e # Disable exit on error for cleanup

log_info "Cleaning up before exit with code ${rc}"

#

# Add any cleanup commands here

#

# Send EOF to log file descriptor if used

exec >&- 2>&-

exit ${rc}

}

# ==========================================================

# Main script execution

# ==========================================================

parse_args "$@"

# Redirect logs to file if specified

exec > >(tee -ai ${LOG_FILE}) 2>&1

trap '' PIPE # Ignore SIGPIPE to prevent broken pipe errors

fi

# Set traps for signals

trap 'sig_handler SIGINT' SIGINT

trap 'sig_handler SIGTERM' SIGTERM

trap 'cleanup' EXIT

main