From 09a694c6492ffa6502a085f19e8eec948d4d1e72 Mon Sep 17 00:00:00 2001 From: DeadFire Date: Fri, 4 Dec 2015 15:56:20 +0800 Subject: [PATCH] =?UTF-8?q?20151204-2=20=E9=80=89=E9=A2=98?= MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit 20151204-2 选题 --- ...04 Linux or Unix--jobs Command Examples.md | 195 ++++++++++++++++++ 1 file changed, 195 insertions(+) create mode 100644 sources/tech/20151204 Linux or Unix--jobs Command Examples.md diff --git a/sources/tech/20151204 Linux or Unix--jobs Command Examples.md b/sources/tech/20151204 Linux or Unix--jobs Command Examples.md new file mode 100644 index 0000000000..560a1ea1e8 --- /dev/null +++ b/sources/tech/20151204 Linux or Unix--jobs Command Examples.md @@ -0,0 +1,195 @@ +Linux / Unix: jobs Command Examples +================================================================================ +I am new Linux and Unix user. How do I show the active jobs on Linux or Unix-like systems using BASH/KSH/TCSH or POSIX based shell? How can I display status of jobs in the current session on Unix/Linux? + +Job control is nothing but the ability to stop/suspend the execution of processes (command) and continue/resume their execution as per your requirements. This is done using your operating system and shell such as bash/ksh or POSIX shell. + +You shell keeps a table of currently executing jobs and can be displayed with jobs command. + +### Purpose ### + +> Displays status of jobs in the current shell session. + +### Syntax ### + +The basic syntax is as follows: + + jobs + +OR + + jobs jobID + +OR + + jobs [options] jobID + +### Starting few jobs for demonstration purpose ### + +Before you start using jobs command, you need to start couple of jobs on your system. Type the following commands to start jobs: + + ## Start xeyes, calculator, and gedit text editor ### + xeyes & + gnome-calculator & + gedit fetch-stock-prices.py & + +Finally, run ping command in foreground: + + ping www.cyberciti.biz + +To suspend ping command job hit the **Ctrl-Z** key sequence. + +### jobs command examples ### + +To display the status of jobs in the current shell, enter: + + $ jobs + +Sample outputs: + + [1] 7895 Running gpass & + [2] 7906 Running gnome-calculator & + [3]- 7910 Running gedit fetch-stock-prices.py & + [4]+ 7946 Stopped ping cyberciti.biz + +To display the process ID or jobs for the job whose name begins with "p," enter: + + $ jobs -p %p + +OR + + $ jobs %p + +Sample outputs: + + [4]- Stopped ping cyberciti.biz + +The character % introduces a job specification. In this example, you are using the string whose name begins with suspended command such as %ping. + +### How do I show process IDs in addition to the normal information? ### + +Pass the -l(lowercase L) option to jobs command for more information about each job listed, run: + + $ jobs -l + +Sample outputs: + +![Fig.01: Displaying the status of jobs in the shell](http://s0.cyberciti.org/uploads/faq/2013/02/jobs-command-output.jpg) +Fig.01: Displaying the status of jobs in the shell + +### How do I list only processes that have changed status since the last notification? ### + +First, start a new job as follows: + + $ sleep 100 & + +Now, only show jobs that have stopped or exited since last notified, type: + + $ jobs -n + +Sample outputs: + + [5]- Running sleep 100 & + +### Display lists process IDs (PIDs) only ### + +Pass the -p option to jobs command to display PIDs only: + + $ jobs -p + +Sample outputs: + + 7895 + 7906 + 7910 + 7946 + 7949 + +### How do I display only running jobs? ### + +Pass the -r option to jobs command to display only running jobs only, type: + + $ jobs -r + +Sample outputs: + + [1] Running gpass & + [2] Running gnome-calculator & + [3]- Running gedit fetch-stock-prices.py & + +### How do I display only jobs that have stopped? ### + +Pass the -s option to jobs command to display only stopped jobs only, type: + + $ jobs -s + +Sample outputs: + + [4]+ Stopped ping cyberciti.biz + +To resume the ping cyberciti.biz job by entering the following bg command: + + $ bg %4 + +### jobs command options ### + +From the [bash(1)][1] command man page: + +注：表格 + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + +
OptionDescription
-lShow process id's in addition to the normal information.
-pShow process id's only.
-nShow only processes that have changed status since the last notification are printed.
-rRestrict output to running jobs only.
-sRestrict output to stopped jobs only.
-xCOMMAND is run after all job specifications that appear in ARGS have been replaced with the process ID of that job's process group leader./td>
+ +### A note about /usr/bin/jobs and shell builtin ### + +Type the following type command to find out whether jobs is part of shell, external command or both: + + $ type -a jobs + +Sample outputs: + + jobs is a shell builtin + jobs is /usr/bin/jobs + +In almost all cases you need to use the jobs command that is implemented as a BASH/KSH/POSIX shell built-in. The /usr/bin/jobs command can not be used in the current shell. The /usr/bin/jobs command operates in a different environment and does not share the parent bash/ksh's shells understanding of jobs. + +-------------------------------------------------------------------------------- + +via: + +作者：Vivek Gite +译者：[译者ID](https://github.com/译者ID) +校对：[校对者ID](https://github.com/校对者ID) + +本文由 [LCTT](https://github.com/LCTT/TranslateProject) 原创编译，[Linux中国](https://linux.cn/) 荣誉推出 + +[1]:http://www.manpager.com/linux/man1/bash.1.html