Kill remote process via ssh
Clash Royale CLAN TAG#URR8PPP
I have a process that I want to kill remotely. I tried
ssh remotehost "kill -9 $(ps -aux | grep foo | grep bar | awk 'print $2')"
but this returns the error
kill: usage: kill [-s sigspec | -n signum | -sigspec] pid | jobspec ... or kill -l [sigspec]
However if I run the command within the quotation marks
kill -9 $(ps -aux | grep foo | grep bar | awk 'print $2')
on the remote host it works fine. Am I missing something here?
ssh process quoting kill remote
edited Jan 24 at 10:29
Jeff Schaller
41.3k1056131
asked Jan 24 at 6:15
chrisechrise
1313
add a comment |
I have a process that I want to kill remotely. I tried
ssh remotehost "kill -9 $(ps -aux | grep foo | grep bar | awk 'print $2')"
but this returns the error
kill: usage: kill [-s sigspec | -n signum | -sigspec] pid | jobspec ... or kill -l [sigspec]
However if I run the command within the quotation marks
kill -9 $(ps -aux | grep foo | grep bar | awk 'print $2')
on the remote host it works fine. Am I missing something here?
ssh process quoting kill remote
edited Jan 24 at 10:29
Jeff Schaller
41.3k1056131
asked Jan 24 at 6:15
chrisechrise
1313
add a comment |
I have a process that I want to kill remotely. I tried
ssh remotehost "kill -9 $(ps -aux | grep foo | grep bar | awk 'print $2')"
but this returns the error
kill: usage: kill [-s sigspec | -n signum | -sigspec] pid | jobspec ... or kill -l [sigspec]
However if I run the command within the quotation marks
kill -9 $(ps -aux | grep foo | grep bar | awk 'print $2')
on the remote host it works fine. Am I missing something here?
ssh process quoting kill remote
edited Jan 24 at 10:29
Jeff Schaller
41.3k1056131
asked Jan 24 at 6:15
chrisechrise
1313
I have a process that I want to kill remotely. I tried
ssh remotehost "kill -9 $(ps -aux | grep foo | grep bar | awk 'print $2')"
but this returns the error
kill: usage: kill [-s sigspec | -n signum | -sigspec] pid | jobspec ... or kill -l [sigspec]
However if I run the command within the quotation marks
kill -9 $(ps -aux | grep foo | grep bar | awk 'print $2')
on the remote host it works fine. Am I missing something here?
ssh process quoting kill remote
ssh process quoting kill remote
edited Jan 24 at 10:29
Jeff Schaller
41.3k1056131
asked Jan 24 at 6:15
chrisechrise
1313
edited Jan 24 at 10:29
Jeff Schaller
41.3k1056131
asked Jan 24 at 6:15
chrisechrise
1313
edited Jan 24 at 10:29
Jeff Schaller
41.3k1056131
edited Jan 24 at 10:29
Jeff Schaller
41.3k1056131
edited Jan 24 at 10:29
Jeff Schaller
41.3k1056131
41.3k1056131
asked Jan 24 at 6:15
chrisechrise
1313
asked Jan 24 at 6:15
chrisechrise
1313
asked Jan 24 at 6:15
chrisechrise
1313
1313
add a comment |
add a comment |
1 Answer
1
active
oldest
votes
The $(..) command substitution would fail as the $ is expanded by the local shell even before it is passed to the stdin of the ssh command. You either need to escape it or use here-strings.
Also the command inside the awk that prints $2 gets interpolated as a command-line argument. So we escape it to defer its expansion until the command is executed remotely.
With escaping,
ssh remotehost "kill -9 $(ps -aux | grep foo | grep bar | awk 'print $2')"
or with here-doc
ssh remotehost <<'EOF'
kill -9 $(ps -aux | grep foo | grep bar | awk 'print $2')
EOF
Also note that grep .. | grep .. | awk is superfluous. You can do the whole operation with awk alone. Or even better use pkill to get the process to kill directly by name.
answered Jan 24 at 6:18
InianInian
4,355925
ah, interesting. I thought it would ship the complete expression within the quotation marks just as it is. So the $ will be evaluated immediately?
– chrise
Jan 24 at 6:26
@chrise: In that case, it is preferred to use the second approach involving here-doc
– Inian
Jan 24 at 6:28
either way I try seems to not return. So if I run it from command line, it doesnt go back to the prompt. If I run it from a script it doesnt go to the next line. Do I need to somehow explicitly exit this?
– chrise
Jan 24 at 6:48
@chrise: You should use the here-docs carefully. There shouldn't be any leading spaces in the line after'EOF', any leading spaces should be removed
– Inian
Jan 24 at 6:49
add a comment |
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1 Answer
1
active
oldest
votes
1 Answer
1
active
oldest
votes
active
oldest
votes
active
oldest
votes
The $(..) command substitution would fail as the $ is expanded by the local shell even before it is passed to the stdin of the ssh command. You either need to escape it or use here-strings.
Also the command inside the awk that prints $2 gets interpolated as a command-line argument. So we escape it to defer its expansion until the command is executed remotely.
With escaping,
ssh remotehost "kill -9 $(ps -aux | grep foo | grep bar | awk 'print $2')"
or with here-doc
ssh remotehost <<'EOF'
kill -9 $(ps -aux | grep foo | grep bar | awk 'print $2')
EOF
Also note that grep .. | grep .. | awk is superfluous. You can do the whole operation with awk alone. Or even better use pkill to get the process to kill directly by name.
answered Jan 24 at 6:18
InianInian
4,355925
ah, interesting. I thought it would ship the complete expression within the quotation marks just as it is. So the $ will be evaluated immediately?
– chrise
Jan 24 at 6:26
@chrise: In that case, it is preferred to use the second approach involving here-doc
– Inian
Jan 24 at 6:28
either way I try seems to not return. So if I run it from command line, it doesnt go back to the prompt. If I run it from a script it doesnt go to the next line. Do I need to somehow explicitly exit this?
– chrise
Jan 24 at 6:48
@chrise: You should use the here-docs carefully. There shouldn't be any leading spaces in the line after'EOF', any leading spaces should be removed
– Inian
Jan 24 at 6:49
add a comment |
The $(..) command substitution would fail as the $ is expanded by the local shell even before it is passed to the stdin of the ssh command. You either need to escape it or use here-strings.
Also the command inside the awk that prints $2 gets interpolated as a command-line argument. So we escape it to defer its expansion until the command is executed remotely.
With escaping,
ssh remotehost "kill -9 $(ps -aux | grep foo | grep bar | awk 'print $2')"
or with here-doc
ssh remotehost <<'EOF'
kill -9 $(ps -aux | grep foo | grep bar | awk 'print $2')
EOF
Also note that grep .. | grep .. | awk is superfluous. You can do the whole operation with awk alone. Or even better use pkill to get the process to kill directly by name.
answered Jan 24 at 6:18
InianInian
4,355925
ah, interesting. I thought it would ship the complete expression within the quotation marks just as it is. So the $ will be evaluated immediately?
– chrise
Jan 24 at 6:26
@chrise: In that case, it is preferred to use the second approach involving here-doc
– Inian
Jan 24 at 6:28
either way I try seems to not return. So if I run it from command line, it doesnt go back to the prompt. If I run it from a script it doesnt go to the next line. Do I need to somehow explicitly exit this?
– chrise
Jan 24 at 6:48
@chrise: You should use the here-docs carefully. There shouldn't be any leading spaces in the line after'EOF', any leading spaces should be removed
– Inian
Jan 24 at 6:49
add a comment |
The $(..) command substitution would fail as the $ is expanded by the local shell even before it is passed to the stdin of the ssh command. You either need to escape it or use here-strings.
Also the command inside the awk that prints $2 gets interpolated as a command-line argument. So we escape it to defer its expansion until the command is executed remotely.
With escaping,
ssh remotehost "kill -9 $(ps -aux | grep foo | grep bar | awk 'print $2')"
or with here-doc
ssh remotehost <<'EOF'
kill -9 $(ps -aux | grep foo | grep bar | awk 'print $2')
EOF
Also note that grep .. | grep .. | awk is superfluous. You can do the whole operation with awk alone. Or even better use pkill to get the process to kill directly by name.
answered Jan 24 at 6:18
InianInian
4,355925
The $(..) command substitution would fail as the $ is expanded by the local shell even before it is passed to the stdin of the ssh command. You either need to escape it or use here-strings.
Also the command inside the awk that prints $2 gets interpolated as a command-line argument. So we escape it to defer its expansion until the command is executed remotely.
With escaping,
ssh remotehost "kill -9 $(ps -aux | grep foo | grep bar | awk 'print $2')"
or with here-doc
ssh remotehost <<'EOF'
kill -9 $(ps -aux | grep foo | grep bar | awk 'print $2')
EOF
Also note that grep .. | grep .. | awk is superfluous. You can do the whole operation with awk alone. Or even better use pkill to get the process to kill directly by name.
answered Jan 24 at 6:18
InianInian
4,355925
edited Jan 24 at 6:32
answered Jan 24 at 6:18
InianInian
4,355925
answered Jan 24 at 6:18
InianInian
4,355925
answered Jan 24 at 6:18
InianInian
4,355925
4,355925
ah, interesting. I thought it would ship the complete expression within the quotation marks just as it is. So the $ will be evaluated immediately?
– chrise
Jan 24 at 6:26
@chrise: In that case, it is preferred to use the second approach involving here-doc
– Inian
Jan 24 at 6:28
either way I try seems to not return. So if I run it from command line, it doesnt go back to the prompt. If I run it from a script it doesnt go to the next line. Do I need to somehow explicitly exit this?
– chrise
Jan 24 at 6:48
@chrise: You should use the here-docs carefully. There shouldn't be any leading spaces in the line after'EOF', any leading spaces should be removed
– Inian
Jan 24 at 6:49
add a comment |
ah, interesting. I thought it would ship the complete expression within the quotation marks just as it is. So the $ will be evaluated immediately?
– chrise
Jan 24 at 6:26
@chrise: In that case, it is preferred to use the second approach involving here-doc
– Inian
Jan 24 at 6:28
either way I try seems to not return. So if I run it from command line, it doesnt go back to the prompt. If I run it from a script it doesnt go to the next line. Do I need to somehow explicitly exit this?
– chrise
Jan 24 at 6:48
@chrise: You should use the here-docs carefully. There shouldn't be any leading spaces in the line after'EOF', any leading spaces should be removed
– Inian
Jan 24 at 6:49
ah, interesting. I thought it would ship the complete expression within the quotation marks just as it is. So the $ will be evaluated immediately?
– chrise
Jan 24 at 6:26
ah, interesting. I thought it would ship the complete expression within the quotation marks just as it is. So the $ will be evaluated immediately?
– chrise
Jan 24 at 6:26
@chrise: In that case, it is preferred to use the second approach involving here-doc
– Inian
Jan 24 at 6:28
@chrise: In that case, it is preferred to use the second approach involving here-doc
– Inian
Jan 24 at 6:28
either way I try seems to not return. So if I run it from command line, it doesnt go back to the prompt. If I run it from a script it doesnt go to the next line. Do I need to somehow explicitly exit this?
– chrise
Jan 24 at 6:48
either way I try seems to not return. So if I run it from command line, it doesnt go back to the prompt. If I run it from a script it doesnt go to the next line. Do I need to somehow explicitly exit this?
– chrise
Jan 24 at 6:48
@chrise: You should use the here-docs carefully. There shouldn't be any leading spaces in the line after
'EOF', any leading spaces should be removed– Inian
Jan 24 at 6:49
@chrise: You should use the here-docs carefully. There shouldn't be any leading spaces in the line after
'EOF', any leading spaces should be removed– Inian
Jan 24 at 6:49
add a comment |
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