Why can't I see the “wget” job when I execute it in the background?
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
New contributor
add a comment |
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
New contributor
2
You can see it withps -p 31754
– RoVo
13 hours ago
Jjobs
only works for the (this) shell job control (namely&
annotation, ctrl-z orbg
commamd). General process listing (ps -a
will show it)
– eckes
7 hours ago
add a comment |
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
New contributor
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
New contributor
New contributor
edited 13 hours ago
Kusalananda
123k16232380
123k16232380
New contributor
asked 13 hours ago
floydfloyd
1333
1333
New contributor
New contributor
2
You can see it withps -p 31754
– RoVo
13 hours ago
Jjobs
only works for the (this) shell job control (namely&
annotation, ctrl-z orbg
commamd). General process listing (ps -a
will show it)
– eckes
7 hours ago
add a comment |
2
You can see it withps -p 31754
– RoVo
13 hours ago
Jjobs
only works for the (this) shell job control (namely&
annotation, ctrl-z orbg
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
add a comment |
3 Answers
3
active
oldest
votes
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
.
1
it forks a child and the parent exits
– user2497
13 hours ago
@user2497 Yes, see updated answer.
– Kusalananda
11 hours ago
add a comment |
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.
2
It's-bq
, i.e.-b
and-q
, not-bg
.
– Kusalananda
13 hours ago
add a comment |
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.
New contributor
ps
has a-p
option that can be used to query a specific PID, or one may usepgrep wget
.
– Kusalananda
13 hours ago
add a comment |
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3 Answers
3
active
oldest
votes
3 Answers
3
active
oldest
votes
active
oldest
votes
active
oldest
votes
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
.
1
it forks a child and the parent exits
– user2497
13 hours ago
@user2497 Yes, see updated answer.
– Kusalananda
11 hours ago
add a comment |
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
.
1
it forks a child and the parent exits
– user2497
13 hours ago
@user2497 Yes, see updated answer.
– Kusalananda
11 hours ago
add a comment |
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
.
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
.
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
add a comment |
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
add a comment |
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.
2
It's-bq
, i.e.-b
and-q
, not-bg
.
– Kusalananda
13 hours ago
add a comment |
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.
2
It's-bq
, i.e.-b
and-q
, not-bg
.
– Kusalananda
13 hours ago
add a comment |
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.
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.
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
add a comment |
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
add a comment |
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.
New contributor
ps
has a-p
option that can be used to query a specific PID, or one may usepgrep wget
.
– Kusalananda
13 hours ago
add a comment |
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.
New contributor
ps
has a-p
option that can be used to query a specific PID, or one may usepgrep wget
.
– Kusalananda
13 hours ago
add a comment |
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.
New contributor
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.
New contributor
New contributor
answered 13 hours ago
DaselDasel
3817
3817
New contributor
New contributor
ps
has a-p
option that can be used to query a specific PID, or one may usepgrep wget
.
– Kusalananda
13 hours ago
add a comment |
ps
has a-p
option that can be used to query a specific PID, or one may usepgrep 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
add a comment |
floyd is a new contributor. Be nice, and check out our Code of Conduct.
floyd is a new contributor. Be nice, and check out our Code of Conduct.
floyd is a new contributor. Be nice, and check out our Code of Conduct.
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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 orbg
commamd). General process listing (ps -a
will show it)– eckes
7 hours ago