Common commands for managing jobs in Linux

Common commands for managing jobs in Linux

1 put the command or script in the background to run

#命令 &

eg

RPM-IVH zlib**.rpm &

./run.sh &

2 pausing a command to the background

CTRL + Z

3 Viewing background commands

#jobs

Parameters:

-L: The PID is listed in addition to the job number listed

-r: Lists jobs running only in the background (run)

-S: Lists only paused jobs

4 put a suspended job in the background processing BG

CTRL + Z put your homework into the background first

#bg job_id implementation to move the job to the background

5 Set up the background job to the foreground process FG

#fg job_id

6 using Kill to send a signal to operate jobs

Kill-signal%job_id here must add%, otherwise there will be surprise, hey

Parameters:

-L lists the signals that the current kill can use

Signal: Indicates to the background of the job what instructions, with man 7 signal know

-1 (number): Re-read the parameter settings file (similar to reload)

-2: Represents the same action as the keyboard input ctrl-c

-9: Force deletion of a job immediately

-15: Terminate a job in the normal way. Not the same as 9.

Demonstrate:

amp1:~ # cat jobs.sh   # #jobs脚本, input time every two seconds to jobs.txt #!/bin/bashwhile :d o  sleep 2time= ' date + "%h-%m-%s" echo  "this time is   $time"  > > jobs.txtdoneamp1:~ # ./jobs.sh &    # #放到后台运行 [1] 50770You  have new mail in /var/mail/rootamp1:~ # amp1:~ # jobs    # #查看作业 [1]+  running                  ./jobs.sh &amp1:~ # fg 1      # #调用到前台运行./jobs.sh^z         # #ctrl +z  Call Pause [1]+   Stopped                  ./jobs.shamp1:~ # watch cat jobs.txt  # #动态显示jobs. txt Write status This time  is  20-10-49this time is  20-10-51this time is  20-10-53this time is   20-10-55this time is  20-10-57this time is  20-10-59this  time is  20-11-01this time is  20-11-03this time is   20-11-05this time is  20-11-07this time is  20-11-09this time  is  20-11-11this time is  20-11-13this time is   20-11-15   # #看这个时间, Now is the paused state------------------------------------------------------------------amp1:~ # bg 1     # #调用暂停作业, run in the background [1]+ ./jobs.sh &you have new mail in / var/mail/rootamp1:~ # jobs   # #jobs运行状态 [1]+  running                  ./jobs.sh &amp1:~  #  then the upper Amp1:~ # watch cat jobs.txtthis time is  20-10-49this  time is  20-10-51this time is  20-10-53this time is   20-10-55this time is  20-10-57this time is  20-10-59this  time is  20-11-01this time is  20-11-03this time is   20-11-05this time is  20-11-07this time is  20-11-09this time  is  20-11-11this time is  20-11-13this time is   20-11-15this time is  20-18-00  //here has been suspended for 7 minutes and then started again, stating that the BG command took effect this time  is  20-18-02this time is  20-18-04this time is   20-18-06this time is  20-18-08this time is  20-18-10this time  is  20-18-12amp1:~ # kill -9 %1   #成功的杀死jobsamp1: ~ # kill -9 %1-bash: kill: % 1: no such jobyou have new mail in /var/mail/rootamp1:~ #  Jobsamp1:~ # jobs

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Common commands for managing jobs in Linux