bg and fg jobs

1. Start a job into backgroud, use “&”

# backupFile.sh &

2. Switch a running job into backgroud

•  Ctrl + z
• # bg, and Enter

3. Bring a job from background to frontground

• # jobs  –> get the job number, eg. [3]+   backupFile.sh
• # fg 3   –> the job 3 goes to frontground