unix nohup logs are filled with 0 bytes [closed]
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I am running the monitoring scripts in the background. They are supposed to all day (24x7).
In the script, based on the monitor output I have a function to start a process using nohup, redirecting the output to the log file /home/nohub_logs/logfile.txt.
The script works fine for few hours but after these few hours the log file is still zero bytes length. Sometimes if I kill the monitoring script and restart the script I get some output.
nohup startprocessscript.sh >> /home/nohuplog &
Logs are getting generated after some time. For example, if the script is running for the first 24 hours, then after 24 hours the logs are not getting created. If we restart the script the logs are created.
I am not sure why sometime the nohup log files are not getting any generated data. Can anyone help me, please.
logs nohup
edited Oct 30 '17 at 14:54
roaima
40k546109
asked Oct 30 '17 at 13:28
Hari Kris
11
closed as unclear what you're asking by Ipor Sircer, Stephen Rauch, Jeff Schaller, SatÃ…Â Katsura, DarkHeart Nov 1 '17 at 1:13
Please clarify your specific problem or add additional details to highlight exactly what you need. As it's currently written, it’s hard to tell exactly what you're asking. See the How to Ask page for help clarifying this question. If this question can be reworded to fit the rules in the help center, please edit the question.
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up vote
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down vote
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I am running the monitoring scripts in the background. They are supposed to all day (24x7).
In the script, based on the monitor output I have a function to start a process using nohup, redirecting the output to the log file /home/nohub_logs/logfile.txt.
The script works fine for few hours but after these few hours the log file is still zero bytes length. Sometimes if I kill the monitoring script and restart the script I get some output.
nohup startprocessscript.sh >> /home/nohuplog &
Logs are getting generated after some time. For example, if the script is running for the first 24 hours, then after 24 hours the logs are not getting created. If we restart the script the logs are created.
I am not sure why sometime the nohup log files are not getting any generated data. Can anyone help me, please.
logs nohup
edited Oct 30 '17 at 14:54
roaima
40k546109
asked Oct 30 '17 at 13:28
Hari Kris
11
closed as unclear what you're asking by Ipor Sircer, Stephen Rauch, Jeff Schaller, SatÃ…Â Katsura, DarkHeart Nov 1 '17 at 1:13
Please clarify your specific problem or add additional details to highlight exactly what you need. As it's currently written, it’s hard to tell exactly what you're asking. See the How to Ask page for help clarifying this question. If this question can be reworded to fit the rules in the help center, please edit the question.
It seems that some logs are created and updated fine, while some are not. Can you elaborate on that?
– Zip
Oct 30 '17 at 13:47
nohup startprocessscript.sh >> /home/nohuplog & this is the command I am using logs are getting generated after some times say script is working for first 24 hours .. after 24 hours the logs are not getting created. if we restart the script the logs are created.
– Hari Kris
Oct 30 '17 at 14:01
You wrote "filled with 0 bytes", but you really mean that the output files stays empty (at size zero)?
– dhag
Oct 30 '17 at 15:45
add a comment |Â
up vote
0
down vote
favorite
up vote
0
down vote
favorite
I am running the monitoring scripts in the background. They are supposed to all day (24x7).
In the script, based on the monitor output I have a function to start a process using nohup, redirecting the output to the log file /home/nohub_logs/logfile.txt.
The script works fine for few hours but after these few hours the log file is still zero bytes length. Sometimes if I kill the monitoring script and restart the script I get some output.
nohup startprocessscript.sh >> /home/nohuplog &
Logs are getting generated after some time. For example, if the script is running for the first 24 hours, then after 24 hours the logs are not getting created. If we restart the script the logs are created.
I am not sure why sometime the nohup log files are not getting any generated data. Can anyone help me, please.
logs nohup
edited Oct 30 '17 at 14:54
roaima
40k546109
asked Oct 30 '17 at 13:28
Hari Kris
11
I am running the monitoring scripts in the background. They are supposed to all day (24x7).
In the script, based on the monitor output I have a function to start a process using nohup, redirecting the output to the log file /home/nohub_logs/logfile.txt.
The script works fine for few hours but after these few hours the log file is still zero bytes length. Sometimes if I kill the monitoring script and restart the script I get some output.
nohup startprocessscript.sh >> /home/nohuplog &
Logs are getting generated after some time. For example, if the script is running for the first 24 hours, then after 24 hours the logs are not getting created. If we restart the script the logs are created.
I am not sure why sometime the nohup log files are not getting any generated data. Can anyone help me, please.
logs nohup
edited Oct 30 '17 at 14:54
roaima
40k546109
asked Oct 30 '17 at 13:28
Hari Kris
11
edited Oct 30 '17 at 14:54
roaima
40k546109
edited Oct 30 '17 at 14:54
roaima
40k546109
edited Oct 30 '17 at 14:54
roaima
40k546109
40k546109
asked Oct 30 '17 at 13:28
Hari Kris
11
asked Oct 30 '17 at 13:28
Hari Kris
11
asked Oct 30 '17 at 13:28
Hari Kris
11
11
closed as unclear what you're asking by Ipor Sircer, Stephen Rauch, Jeff Schaller, SatÃ…Â Katsura, DarkHeart Nov 1 '17 at 1:13
Please clarify your specific problem or add additional details to highlight exactly what you need. As it's currently written, it’s hard to tell exactly what you're asking. See the How to Ask page for help clarifying this question. If this question can be reworded to fit the rules in the help center, please edit the question.
closed as unclear what you're asking by Ipor Sircer, Stephen Rauch, Jeff Schaller, SatÃ…Â Katsura, DarkHeart Nov 1 '17 at 1:13
Please clarify your specific problem or add additional details to highlight exactly what you need. As it's currently written, it’s hard to tell exactly what you're asking. See the How to Ask page for help clarifying this question. If this question can be reworded to fit the rules in the help center, please edit the question.
It seems that some logs are created and updated fine, while some are not. Can you elaborate on that?
– Zip
Oct 30 '17 at 13:47
nohup startprocessscript.sh >> /home/nohuplog & this is the command I am using logs are getting generated after some times say script is working for first 24 hours .. after 24 hours the logs are not getting created. if we restart the script the logs are created.
– Hari Kris
Oct 30 '17 at 14:01
You wrote "filled with 0 bytes", but you really mean that the output files stays empty (at size zero)?
– dhag
Oct 30 '17 at 15:45
add a comment |Â
It seems that some logs are created and updated fine, while some are not. Can you elaborate on that?
– Zip
Oct 30 '17 at 13:47
nohup startprocessscript.sh >> /home/nohuplog & this is the command I am using logs are getting generated after some times say script is working for first 24 hours .. after 24 hours the logs are not getting created. if we restart the script the logs are created.
– Hari Kris
Oct 30 '17 at 14:01
You wrote "filled with 0 bytes", but you really mean that the output files stays empty (at size zero)?
– dhag
Oct 30 '17 at 15:45
It seems that some logs are created and updated fine, while some are not. Can you elaborate on that?
– Zip
Oct 30 '17 at 13:47
It seems that some logs are created and updated fine, while some are not. Can you elaborate on that?
– Zip
Oct 30 '17 at 13:47
nohup startprocessscript.sh >> /home/nohuplog & this is the command I am using logs are getting generated after some times say script is working for first 24 hours .. after 24 hours the logs are not getting created. if we restart the script the logs are created.
– Hari Kris
Oct 30 '17 at 14:01
nohup startprocessscript.sh >> /home/nohuplog & this is the command I am using logs are getting generated after some times say script is working for first 24 hours .. after 24 hours the logs are not getting created. if we restart the script the logs are created.
– Hari Kris
Oct 30 '17 at 14:01
You wrote "filled with 0 bytes", but you really mean that the output files stays empty (at size zero)?
– dhag
Oct 30 '17 at 15:45
You wrote "filled with 0 bytes", but you really mean that the output files stays empty (at size zero)?
– dhag
Oct 30 '17 at 15:45
add a comment |Â
1 Answer
1
active
oldest
votes
up vote
2
down vote
A common reason for this issue is output buffering.
Your script output might be flushed to the log file only after enough data has been written.
Possible workarounds are stdbuf and unbuffer see Turn off buffering in pipe
answered Oct 30 '17 at 14:48
jlliagre
45k578124
add a comment |Â
1 Answer
1
active
oldest
votes
1 Answer
1
active
oldest
votes
active
oldest
votes
active
oldest
votes
up vote
2
down vote
A common reason for this issue is output buffering.
Your script output might be flushed to the log file only after enough data has been written.
Possible workarounds are stdbuf and unbuffer see Turn off buffering in pipe
answered Oct 30 '17 at 14:48
jlliagre
45k578124
add a comment |Â
up vote
2
down vote
A common reason for this issue is output buffering.
Your script output might be flushed to the log file only after enough data has been written.
Possible workarounds are stdbuf and unbuffer see Turn off buffering in pipe
answered Oct 30 '17 at 14:48
jlliagre
45k578124
add a comment |Â
up vote
2
down vote
up vote
2
down vote
A common reason for this issue is output buffering.
Your script output might be flushed to the log file only after enough data has been written.
Possible workarounds are stdbuf and unbuffer see Turn off buffering in pipe
answered Oct 30 '17 at 14:48
jlliagre
45k578124
A common reason for this issue is output buffering.
Your script output might be flushed to the log file only after enough data has been written.
Possible workarounds are stdbuf and unbuffer see Turn off buffering in pipe
answered Oct 30 '17 at 14:48
jlliagre
45k578124
answered Oct 30 '17 at 14:48
jlliagre
45k578124
answered Oct 30 '17 at 14:48
jlliagre
45k578124
answered Oct 30 '17 at 14:48
jlliagre
45k578124
45k578124
add a comment |Â
add a comment |Â
It seems that some logs are created and updated fine, while some are not. Can you elaborate on that?
– Zip
Oct 30 '17 at 13:47
nohup startprocessscript.sh >> /home/nohuplog & this is the command I am using logs are getting generated after some times say script is working for first 24 hours .. after 24 hours the logs are not getting created. if we restart the script the logs are created.
– Hari Kris
Oct 30 '17 at 14:01
You wrote "filled with 0 bytes", but you really mean that the output files stays empty (at size zero)?
– dhag
Oct 30 '17 at 15:45