send input to netcat and save output
I am trying to send a command to netcat which will result into an output and I want to save that output to a file.
while true; do echo "showHistory userx"; done | nc -w1 xxx.xxx.xxx.xx 2222 > out.txt &
I tried a lot of google searches and read a lot of stackexchange questions but could not solve it. I played around with while, tee, mkfifo but no luck.
The file out.txt remains blank but has a lot of NUL chars
Edit: I have updated showhistory to showHistory userx in order to highlight that it is a command to be supplied over telnet/netcat session
linux centos netcat
asked Feb 6 '18 at 22:44
th3pirat3th3pirat3
1013
add a comment |
I am trying to send a command to netcat which will result into an output and I want to save that output to a file.
while true; do echo "showHistory userx"; done | nc -w1 xxx.xxx.xxx.xx 2222 > out.txt &
I tried a lot of google searches and read a lot of stackexchange questions but could not solve it. I played around with while, tee, mkfifo but no luck.
The file out.txt remains blank but has a lot of NUL chars
Edit: I have updated showhistory to showHistory userx in order to highlight that it is a command to be supplied over telnet/netcat session
linux centos netcat
asked Feb 6 '18 at 22:44
th3pirat3th3pirat3
1013
You might want to use&>instead of>to send bothstdoutandstderrto the file. Otherwise you have to be more precise about what is not working.
– pfnuesel
Feb 6 '18 at 22:49
1
If I'm guessing right, your problem is that file is empty, right ? Quote from bash manual:"Background processes which attempt to read from (write to when stty tostop is in effect) the terminal are sent a SIGTTIN (SIGTTOU) signal by the kernel's terminal driver, which, unless caught, suspends the process". There's your reason - get rid of&part
– Sergiy Kolodyazhnyy
Feb 6 '18 at 22:50
1
And I don't know why thatshowhistoryis needed, butyes showhistorydoes the same.
– pfnuesel
Feb 6 '18 at 22:51
add a comment |
I am trying to send a command to netcat which will result into an output and I want to save that output to a file.
while true; do echo "showHistory userx"; done | nc -w1 xxx.xxx.xxx.xx 2222 > out.txt &
I tried a lot of google searches and read a lot of stackexchange questions but could not solve it. I played around with while, tee, mkfifo but no luck.
The file out.txt remains blank but has a lot of NUL chars
Edit: I have updated showhistory to showHistory userx in order to highlight that it is a command to be supplied over telnet/netcat session
linux centos netcat
asked Feb 6 '18 at 22:44
th3pirat3th3pirat3
1013
I am trying to send a command to netcat which will result into an output and I want to save that output to a file.
while true; do echo "showHistory userx"; done | nc -w1 xxx.xxx.xxx.xx 2222 > out.txt &
I tried a lot of google searches and read a lot of stackexchange questions but could not solve it. I played around with while, tee, mkfifo but no luck.
The file out.txt remains blank but has a lot of NUL chars
Edit: I have updated showhistory to showHistory userx in order to highlight that it is a command to be supplied over telnet/netcat session
linux centos netcat
linux centos netcat
asked Feb 6 '18 at 22:44
th3pirat3th3pirat3
1013
asked Feb 6 '18 at 22:44
th3pirat3th3pirat3
1013
edited Feb 6 '18 at 22:55
th3pirat3
asked Feb 6 '18 at 22:44
th3pirat3th3pirat3
1013
asked Feb 6 '18 at 22:44
th3pirat3th3pirat3
1013
asked Feb 6 '18 at 22:44
th3pirat3th3pirat3
1013
1013
You might want to use&>instead of>to send bothstdoutandstderrto the file. Otherwise you have to be more precise about what is not working.
– pfnuesel
Feb 6 '18 at 22:49
1
If I'm guessing right, your problem is that file is empty, right ? Quote from bash manual:"Background processes which attempt to read from (write to when stty tostop is in effect) the terminal are sent a SIGTTIN (SIGTTOU) signal by the kernel's terminal driver, which, unless caught, suspends the process". There's your reason - get rid of&part
– Sergiy Kolodyazhnyy
Feb 6 '18 at 22:50
1
And I don't know why thatshowhistoryis needed, butyes showhistorydoes the same.
– pfnuesel
Feb 6 '18 at 22:51
add a comment |
You might want to use&>instead of>to send bothstdoutandstderrto the file. Otherwise you have to be more precise about what is not working.
– pfnuesel
Feb 6 '18 at 22:49
1
If I'm guessing right, your problem is that file is empty, right ? Quote from bash manual:"Background processes which attempt to read from (write to when stty tostop is in effect) the terminal are sent a SIGTTIN (SIGTTOU) signal by the kernel's terminal driver, which, unless caught, suspends the process". There's your reason - get rid of&part
– Sergiy Kolodyazhnyy
Feb 6 '18 at 22:50
1
And I don't know why thatshowhistoryis needed, butyes showhistorydoes the same.
– pfnuesel
Feb 6 '18 at 22:51
You might want to use
&> instead of > to send both stdout and stderr to the file. Otherwise you have to be more precise about what is not working.– pfnuesel
Feb 6 '18 at 22:49
You might want to use
&> instead of > to send both stdout and stderr to the file. Otherwise you have to be more precise about what is not working.– pfnuesel
Feb 6 '18 at 22:49
1
1
If I'm guessing right, your problem is that file is empty, right ? Quote from bash manual:"Background processes which attempt to read from (write to when stty tostop is in effect) the terminal are sent a SIGTTIN (SIGTTOU) signal by the kernel's terminal driver, which, unless caught, suspends the process". There's your reason - get rid of
& part– Sergiy Kolodyazhnyy
Feb 6 '18 at 22:50
If I'm guessing right, your problem is that file is empty, right ? Quote from bash manual:"Background processes which attempt to read from (write to when stty tostop is in effect) the terminal are sent a SIGTTIN (SIGTTOU) signal by the kernel's terminal driver, which, unless caught, suspends the process". There's your reason - get rid of
& part– Sergiy Kolodyazhnyy
Feb 6 '18 at 22:50
1
1
And I don't know why that
showhistory is needed, but yes showhistory does the same.– pfnuesel
Feb 6 '18 at 22:51
And I don't know why that
showhistory is needed, but yes showhistory does the same.– pfnuesel
Feb 6 '18 at 22:51
add a comment |
1 Answer
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I've found smth like that
for port scanning output(ex. my router)
nc -zv 192.168.0.1 1-1000 2>&1 | grep open | tee report.txt
read a report
cat report.txt
output
_gateway [192.168.0.1] 80 (http) open
_gateway [192.168.0.1] 22 (ssh) open
In snapshot
answered Jan 8 at 1:14
AlexAlex
1
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1 Answer
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active
oldest
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active
oldest
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active
oldest
votes
I've found smth like that
for port scanning output(ex. my router)
nc -zv 192.168.0.1 1-1000 2>&1 | grep open | tee report.txt
read a report
cat report.txt
output
_gateway [192.168.0.1] 80 (http) open
_gateway [192.168.0.1] 22 (ssh) open
In snapshot
answered Jan 8 at 1:14
AlexAlex
1
New contributor
Alex is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
add a comment |
I've found smth like that
for port scanning output(ex. my router)
nc -zv 192.168.0.1 1-1000 2>&1 | grep open | tee report.txt
read a report
cat report.txt
output
_gateway [192.168.0.1] 80 (http) open
_gateway [192.168.0.1] 22 (ssh) open
In snapshot
answered Jan 8 at 1:14
AlexAlex
1
New contributor
Alex is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
add a comment |
I've found smth like that
for port scanning output(ex. my router)
nc -zv 192.168.0.1 1-1000 2>&1 | grep open | tee report.txt
read a report
cat report.txt
output
_gateway [192.168.0.1] 80 (http) open
_gateway [192.168.0.1] 22 (ssh) open
In snapshot
answered Jan 8 at 1:14
AlexAlex
1
New contributor
Alex is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
I've found smth like that
for port scanning output(ex. my router)
nc -zv 192.168.0.1 1-1000 2>&1 | grep open | tee report.txt
read a report
cat report.txt
output
_gateway [192.168.0.1] 80 (http) open
_gateway [192.168.0.1] 22 (ssh) open
In snapshot
answered Jan 8 at 1:14
AlexAlex
1
New contributor
Alex is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
answered Jan 8 at 1:14
AlexAlex
1
New contributor
Alex is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
answered Jan 8 at 1:14
AlexAlex
1
answered Jan 8 at 1:14
AlexAlex
1
1
New contributor
Alex is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
New contributor
Alex is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
Alex is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
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You might want to use
&>instead of>to send bothstdoutandstderrto the file. Otherwise you have to be more precise about what is not working.– pfnuesel
Feb 6 '18 at 22:49
1
If I'm guessing right, your problem is that file is empty, right ? Quote from bash manual:"Background processes which attempt to read from (write to when stty tostop is in effect) the terminal are sent a SIGTTIN (SIGTTOU) signal by the kernel's terminal driver, which, unless caught, suspends the process". There's your reason - get rid of
&part– Sergiy Kolodyazhnyy
Feb 6 '18 at 22:50
1
And I don't know why that
showhistoryis needed, butyes showhistorydoes the same.– pfnuesel
Feb 6 '18 at 22:51