Why can't I see the “wget” job when I execute it in the background?












6















I use wget command in the background like this



wget -bq


and it prints




Continuing in background, pid 31754.




But when I type the command jobs, I don't see my job(although the downloading is not finished).






command-line wget background-process job-control







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  • 2





    You can see it with ps -p 31754

    – RoVo
    13 hours ago













  • Jjobs only works for the (this) shell job control (namely & annotation, ctrl-z or bg commamd). General process listing (ps -a will show it)

    – eckes
    7 hours ago
















6















I use wget command in the background like this



wget -bq


and it prints




Continuing in background, pid 31754.




But when I type the command jobs, I don't see my job(although the downloading is not finished).






command-line wget background-process job-control







share|improve this question









New contributor




floyd is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
















  • 2





    You can see it with ps -p 31754

    – RoVo
    13 hours ago













  • Jjobs only works for the (this) shell job control (namely & annotation, ctrl-z or bg commamd). General process listing (ps -a will show it)

    – eckes
    7 hours ago














6












6








6








I use wget command in the background like this



wget -bq


and it prints




Continuing in background, pid 31754.




But when I type the command jobs, I don't see my job(although the downloading is not finished).






command-line wget background-process job-control







share|improve this question









New contributor




floyd is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.












I use wget command in the background like this



wget -bq


and it prints




Continuing in background, pid 31754.




But when I type the command jobs, I don't see my job(although the downloading is not finished).






command-line wget background-process job-control




command-line wget background-process job-control






share|improve this question









New contributor




floyd is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.











share|improve this question









New contributor




floyd is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.









share|improve this question




share|improve this question








edited 13 hours ago









Kusalananda

123k16232380




123k16232380






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asked 13 hours ago









floydfloyd

1333




1333




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  • 2





    You can see it with ps -p 31754

    – RoVo
    13 hours ago













  • Jjobs only works for the (this) shell job control (namely & annotation, ctrl-z or bg commamd). General process listing (ps -a will show it)

    – eckes
    7 hours ago














  • 2





    You can see it with ps -p 31754

    – RoVo
    13 hours ago













  • Jjobs only works for the (this) shell job control (namely & annotation, ctrl-z or bg commamd). General process listing (ps -a will show it)

    – eckes
    7 hours ago








2




2





You can see it with ps -p 31754

– RoVo
13 hours ago







You can see it with ps -p 31754

– RoVo
13 hours ago















Jjobs only works for the (this) shell job control (namely & annotation, ctrl-z or bg commamd). General process listing (ps -a will show it)

– eckes
7 hours ago





Jjobs only works for the (this) shell job control (namely & annotation, ctrl-z or bg commamd). General process listing (ps -a will show it)

– eckes
7 hours ago










3 Answers
3






active

oldest

votes


















12














When using wget with -b or --background it puts itself into the background by disassociating from the current shell (by forking off a child process and terminating the parent). Since it's not the shell that puts it in the background as an asynchronous job, it will not show up as a job when you use jobs.



To run wget as an asynchronous (background) job in the shell, use



wget ... URL &


If you do this, you may additionally want to redirect output to some file (which wget does automatically with -b), or discard it by redirecting to /dev/null, or use -q or --quiet.






share|improve this answer





















  • 1





    it forks a child and the parent exits

    – user2497
    13 hours ago











  • @user2497 Yes, see updated answer.

    – Kusalananda
    11 hours ago



















5














Because it put it self in the background. Use & to tell bash to put it into background, and to put it into bash's list of jobs.



Background and job control list are not the same. Bash puts all of its background processes into its jobs control list (by default), but processes can be backgrounded with out being put in the list. Only bash can put jobs in its list.



There may be advantages to the -bg option (I don't know what). For example ssh's background option, puts it into the background after asking for a password.






share|improve this answer



















  • 2





    It's -bq, i.e. -b and -q, not -bg.

    – Kusalananda
    13 hours ago



















2














The process with pid 31754 exists; if you type ps -e |grep 31754 but as it is not a job that can be moved to the foreground again, it is not displayed by the jobs command. wget -bq automatically send the output to the background without options to move it to the foreground again.






share|improve this answer








New contributor




Dasel is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.





















  • ps has a -p option that can be used to query a specific PID, or one may use pgrep wget.

    – Kusalananda
    13 hours ago











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3 Answers
3






active

oldest

votes








3 Answers
3






active

oldest

votes









active

oldest

votes






active

oldest

votes









12














When using wget with -b or --background it puts itself into the background by disassociating from the current shell (by forking off a child process and terminating the parent). Since it's not the shell that puts it in the background as an asynchronous job, it will not show up as a job when you use jobs.



To run wget as an asynchronous (background) job in the shell, use



wget ... URL &


If you do this, you may additionally want to redirect output to some file (which wget does automatically with -b), or discard it by redirecting to /dev/null, or use -q or --quiet.






share|improve this answer





















  • 1





    it forks a child and the parent exits

    – user2497
    13 hours ago











  • @user2497 Yes, see updated answer.

    – Kusalananda
    11 hours ago
















12














When using wget with -b or --background it puts itself into the background by disassociating from the current shell (by forking off a child process and terminating the parent). Since it's not the shell that puts it in the background as an asynchronous job, it will not show up as a job when you use jobs.



To run wget as an asynchronous (background) job in the shell, use



wget ... URL &


If you do this, you may additionally want to redirect output to some file (which wget does automatically with -b), or discard it by redirecting to /dev/null, or use -q or --quiet.






share|improve this answer





















  • 1





    it forks a child and the parent exits

    – user2497
    13 hours ago











  • @user2497 Yes, see updated answer.

    – Kusalananda
    11 hours ago














12












12








12







When using wget with -b or --background it puts itself into the background by disassociating from the current shell (by forking off a child process and terminating the parent). Since it's not the shell that puts it in the background as an asynchronous job, it will not show up as a job when you use jobs.



To run wget as an asynchronous (background) job in the shell, use



wget ... URL &


If you do this, you may additionally want to redirect output to some file (which wget does automatically with -b), or discard it by redirecting to /dev/null, or use -q or --quiet.






share|improve this answer















When using wget with -b or --background it puts itself into the background by disassociating from the current shell (by forking off a child process and terminating the parent). Since it's not the shell that puts it in the background as an asynchronous job, it will not show up as a job when you use jobs.



To run wget as an asynchronous (background) job in the shell, use



wget ... URL &


If you do this, you may additionally want to redirect output to some file (which wget does automatically with -b), or discard it by redirecting to /dev/null, or use -q or --quiet.







share|improve this answer














share|improve this answer



share|improve this answer








edited 11 hours ago

























answered 13 hours ago









KusalanandaKusalananda

123k16232380




123k16232380








  • 1





    it forks a child and the parent exits

    – user2497
    13 hours ago











  • @user2497 Yes, see updated answer.

    – Kusalananda
    11 hours ago














  • 1





    it forks a child and the parent exits

    – user2497
    13 hours ago











  • @user2497 Yes, see updated answer.

    – Kusalananda
    11 hours ago








1




1





it forks a child and the parent exits

– user2497
13 hours ago





it forks a child and the parent exits

– user2497
13 hours ago













@user2497 Yes, see updated answer.

– Kusalananda
11 hours ago





@user2497 Yes, see updated answer.

– Kusalananda
11 hours ago













5














Because it put it self in the background. Use & to tell bash to put it into background, and to put it into bash's list of jobs.



Background and job control list are not the same. Bash puts all of its background processes into its jobs control list (by default), but processes can be backgrounded with out being put in the list. Only bash can put jobs in its list.



There may be advantages to the -bg option (I don't know what). For example ssh's background option, puts it into the background after asking for a password.






share|improve this answer



















  • 2





    It's -bq, i.e. -b and -q, not -bg.

    – Kusalananda
    13 hours ago
















5














Because it put it self in the background. Use & to tell bash to put it into background, and to put it into bash's list of jobs.



Background and job control list are not the same. Bash puts all of its background processes into its jobs control list (by default), but processes can be backgrounded with out being put in the list. Only bash can put jobs in its list.



There may be advantages to the -bg option (I don't know what). For example ssh's background option, puts it into the background after asking for a password.






share|improve this answer



















  • 2





    It's -bq, i.e. -b and -q, not -bg.

    – Kusalananda
    13 hours ago














5












5








5







Because it put it self in the background. Use & to tell bash to put it into background, and to put it into bash's list of jobs.



Background and job control list are not the same. Bash puts all of its background processes into its jobs control list (by default), but processes can be backgrounded with out being put in the list. Only bash can put jobs in its list.



There may be advantages to the -bg option (I don't know what). For example ssh's background option, puts it into the background after asking for a password.






share|improve this answer













Because it put it self in the background. Use & to tell bash to put it into background, and to put it into bash's list of jobs.



Background and job control list are not the same. Bash puts all of its background processes into its jobs control list (by default), but processes can be backgrounded with out being put in the list. Only bash can put jobs in its list.



There may be advantages to the -bg option (I don't know what). For example ssh's background option, puts it into the background after asking for a password.







share|improve this answer












share|improve this answer



share|improve this answer










answered 13 hours ago









ctrl-alt-delorctrl-alt-delor

11k41958




11k41958








  • 2





    It's -bq, i.e. -b and -q, not -bg.

    – Kusalananda
    13 hours ago














  • 2





    It's -bq, i.e. -b and -q, not -bg.

    – Kusalananda
    13 hours ago








2




2





It's -bq, i.e. -b and -q, not -bg.

– Kusalananda
13 hours ago





It's -bq, i.e. -b and -q, not -bg.

– Kusalananda
13 hours ago











2














The process with pid 31754 exists; if you type ps -e |grep 31754 but as it is not a job that can be moved to the foreground again, it is not displayed by the jobs command. wget -bq automatically send the output to the background without options to move it to the foreground again.






share|improve this answer








New contributor




Dasel is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.





















  • ps has a -p option that can be used to query a specific PID, or one may use pgrep wget.

    – Kusalananda
    13 hours ago
















2














The process with pid 31754 exists; if you type ps -e |grep 31754 but as it is not a job that can be moved to the foreground again, it is not displayed by the jobs command. wget -bq automatically send the output to the background without options to move it to the foreground again.






share|improve this answer








New contributor




Dasel is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.





















  • ps has a -p option that can be used to query a specific PID, or one may use pgrep wget.

    – Kusalananda
    13 hours ago














2












2








2







The process with pid 31754 exists; if you type ps -e |grep 31754 but as it is not a job that can be moved to the foreground again, it is not displayed by the jobs command. wget -bq automatically send the output to the background without options to move it to the foreground again.






share|improve this answer








New contributor




Dasel is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.










The process with pid 31754 exists; if you type ps -e |grep 31754 but as it is not a job that can be moved to the foreground again, it is not displayed by the jobs command. wget -bq automatically send the output to the background without options to move it to the foreground again.







share|improve this answer








New contributor




Dasel is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.









share|improve this answer



share|improve this answer






New contributor




Dasel is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.









answered 13 hours ago









DaselDasel

3817




3817




New contributor




Dasel is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.





New contributor





Dasel is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.






Dasel is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.













  • ps has a -p option that can be used to query a specific PID, or one may use pgrep wget.

    – Kusalananda
    13 hours ago



















  • ps has a -p option that can be used to query a specific PID, or one may use pgrep wget.

    – Kusalananda
    13 hours ago

















ps has a -p option that can be used to query a specific PID, or one may use pgrep wget.

– Kusalananda
13 hours ago





ps has a -p option that can be used to query a specific PID, or one may use pgrep wget.

– Kusalananda
13 hours ago










floyd is a new contributor. Be nice, and check out our Code of Conduct.










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floyd is a new contributor. Be nice, and check out our Code of Conduct.












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