Linuxで定期実行する方法【crontab】

概要

• crontabの設定方法を忘れてしまうので、簡単にまとめる

設定方法

# 設定ファイルを開く
crontab -e

設定方法

/tmp/crontab.lb4eVp/crontab

# Edit this file to introduce tasks to be run by cron.
#
# Each task to run has to be defined through a single line
# indicating with different fields when the task will be run
# and what command to run for the task
#
# To define the time you can provide concrete values for
# minute (m), hour (h), day of month (dom), month (mon),
# and day of week (dow) or use '*' in these fields (for 'any').
#
# Notice that tasks will be started based on the cron's system
# daemon's notion of time and timezones.
#
# Output of the crontab jobs (including errors) is sent through
# email to the user the crontab file belongs to (unless redirected).
#
# For example, you can run a backup of all your user accounts
# at 5 a.m every week with:
# 0 5 * * 1 tar -zcf /var/backups/home.tgz /home/
#
# For more information see the manual pages of crontab(5) and cron(8)
#
# m h  dom mon dow   command

# 時間の指定　繰り返し間隔　実行コマンド
00 20 * * * /home/pochi/.nvm/versions/node/v20.11.1/bin/node /home/pochi/program/notify_rakuten_card_usage_stable-0.1.0/dist/App/Adapter/Cli/FetchRakutenCardTransactions.js
00 00 * * * /home/pochi/.nvm/versions/node/v20.11.1/bin/node /home/pochi/program/notify_rakuten_card_usage_stable-0.1.0/dist/App/Adapter/Cli/FetchRakutenCardTransactions.js

19 00 * * * /home/pochi/.nvm/versions/node/v20.11.1/bin/node /home/pochi/program/notify_rakuten_card_usage_stable-0.1.0/dist/App/Adapter/Cli/FetchRakutenCardTransactions.js

今回は、nodeのパスと、実行したいファイルの絶対パスを指定して実行した

ログの確認方法

# ラズパイOSではどちらかで取得可能
journalctl | grep CRON
journalctl -u cron.service

ほかの環境では試せていないが、ほかにもログに関しては取り方がいっぱいありそうであった、、