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
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
You might want to use&>
instead of>
to send bothstdout
andstderr
to 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 thatshowhistory
is needed, butyes showhistory
does 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
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
edited Feb 6 '18 at 22:55
th3pirat3
asked Feb 6 '18 at 22:44
th3pirat3th3pirat3
1013
1013
You might want to use&>
instead of>
to send bothstdout
andstderr
to 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 thatshowhistory
is needed, butyes showhistory
does the same.
– pfnuesel
Feb 6 '18 at 22:51
add a comment |
You might want to use&>
instead of>
to send bothstdout
andstderr
to 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 thatshowhistory
is needed, butyes showhistory
does 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
1
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
New contributor
add a comment |
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1 Answer
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active
oldest
votes
1 Answer
1
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
New contributor
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
New contributor
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
New contributor
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
New contributor
New contributor
answered Jan 8 at 1:14
AlexAlex
1
1
New contributor
New contributor
add a comment |
add a comment |
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You might want to use
&>
instead of>
to send bothstdout
andstderr
to 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
showhistory
is needed, butyes showhistory
does the same.– pfnuesel
Feb 6 '18 at 22:51