linux - 后台作业job id后面的后缀 "+"和 "-"是什么意思？

Question

当我运行多个后台进程时，我的命令 jobs 的输出例如是:

[1]-  RUNNING                  nohup somecommand1 &
[2]+  RUNNING                  nohup somecommand2 &

job id 后面的“+”和“-”字符是什么意思？

Answer 1

它位于 STDOUT 下作业的手册页中:

> man jobs

The character '+' identifies the job that would be used as a default for the fg or bg utilities; this job can also be specified using the job_id %+ or "%%" . The character '-' identifies the job that would become the default if the current default job were to exit; this job can also be specified using the job_id %-.

所以标有'+'的工作就是将被'fg'激活的工作。