Linux 中的 fg 命令及示例

linux 中的fg命令用于将后台作业置于前台。

句法：

fg [job_spec]

job_spec可能是：

%n : Refer to job number n.
%str : Refer to a job which was started by a command beginning with str.
%?str : Refer to a job which was started by a command containing str.
%% or %+ : Refer to the current job. fg and bg will operate on this job if no job_spec is given.
%- : Refer to the previous job.

fg命令的选项：

• fg [JOB_SPEC] ：此命令用于将提到的在后台运行的作业置于前台。
  
  “sleep 500”是一个命令，用于创建一个运行 500 秒的虚拟作业。
• fg –help ：显示帮助信息。