工作或生活当中，常常存在这样的需求：将常用的工具、服务做成开机启动项，省去开机后手动触发启动的麻烦。今天在这里记录下Ubuntu 18.04上如何设置开机启动。
一、首先编写一个可执行的启动脚本/root/.runCommandOnBoot.sh
#!/bin/bash#shadowsocks/usr/local/bin/sslocal -c /etc/shadowsocks.json -d start
二、设置开机执行该脚本
root@ThinkPad-T450s:~# crontab -eno crontab for root - using an empty oneSelect an editor. To change later, run 'select-editor'.1. /bin/nano <---- easiest2. /usr/bin/vim.basic3. /usr/bin/vim.tiny4. /usr/bin/code5. /bin/edChoose 1-5 [1]: 1 #这里选择1
接着出现下面的信息：
# 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
在该文件的末尾追加如下信息
@reboot /root/.runCommandOnBoot.sh
保存并退出。控制台出现如下信息，表示创建成功。
crontab: installing new crontab
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