重启停止的作业 bg和fg

因为该作业是默认作业(从加号可以看出)，只需要使用bg命令就可以将其以后台模式重启。 注意，当作业被转入后台模式时，并不会列出其PID。
如果有多个作业，你得在bg命令后加上作业号。

$ ./test11.sh 
^Z
[1]+ Stopped ./test11.sh
$ ./test12.sh 
^Z
[2]+ Stopped ./test12.sh
$
$ bg 2
[2]+ ./test12.sh & 
$
$ jobs
[1]+ Stopped ./test11.sh
[2]- Running ./test12.sh &
$

命令bg 2用于将第二个作业置于后台模式。注意，当使用jobs命令时，它列出了作业及其状态，即便是默认作业当前并未处于后台模式运行。
要以前台模式重启作业，可用带有作业号的fg命令。

$ fg 2
./test12.sh
This is the script's end... 
$

 

code

macname@MacdeMacBook-Pro Desktop % cat test.sh 
#!/bin/bash
# Trapping the script exit #
trap "echo Goodbye..." EXIT #
count=1
while [ $count -le 5 ]
do
echo "Loop #$count"
sleep 1
count=$[ $count + 1 ]
done
macname@localhost Desktop %
macname@localhost Desktop % ./test.sh
Loop #1
Loop #2
Loop #3
^Z
zsh: suspended  ./test.sh
macname@localhost Desktop % 
macname@localhost Desktop % jobs -l  
[1]  + 48715 suspended  ./test.sh
macname@localhost Desktop % 
macname@localhost Desktop % bg  
[1]  + continued  ./test.sh
Loop #4                                                                         
macname@localhost Desktop % Loop #5
Loop #6
Loop #7
Loop #8
Loop #9
Loop #10
Loop #11
Loop #12
Loop #13

macname@localhost Desktop % Loop #14
Loop #15
Loop #16
Loop #17
fg
[1]  + running    ./test.sh
Loop #18
Loop #19
Loop #20
Loop #21
Loop #22
^Z
zsh: suspended  ./test.sh
macname@localhost Desktop % bg
[1]  + continued  ./test.sh
Loop #23                                                                        
macname@localhost Desktop % Loop #24
Loop #25
Loop #26
fg
[1]  + running    ./test.sh
Loop #27
Loop #28
Loop #29
^CGoodbye...

macname@localhost Desktop %