Preventing expansion/evaluation of parameter in ssh command
I have a shell script that runs a docker container on a remote server.
I'm trying to send the hostname of the remote server into the container but i just get the hostname of my local computer where i run the script.
The command looks like this in the script:
ssh $remote "docker run -h '`hostname`'
-e 'VARIABLE=$SCRIPT_VAR'
-e 'HOST_HOSTNAME=`hostname`'
..."
Both hostname and the environment variable host.hostname becomes the name of my local computer.
I know I can use singlequotes like this:
ssh $remote 'echo "`hostname`"'
and it will work. But then i cannot use scriptvariables like the $SCRIPT_VAR
How can i get it to evaluate on the remote server instead while also being able to use variables?
linux shell ssh
edited Nov 14 '18 at 22:53
jww
53.3k40229502
asked Nov 14 '18 at 11:13
mTvmTv
371213
add a comment |
I have a shell script that runs a docker container on a remote server.
I'm trying to send the hostname of the remote server into the container but i just get the hostname of my local computer where i run the script.
The command looks like this in the script:
ssh $remote "docker run -h '`hostname`'
-e 'VARIABLE=$SCRIPT_VAR'
-e 'HOST_HOSTNAME=`hostname`'
..."
Both hostname and the environment variable host.hostname becomes the name of my local computer.
I know I can use singlequotes like this:
ssh $remote 'echo "`hostname`"'
and it will work. But then i cannot use scriptvariables like the $SCRIPT_VAR
How can i get it to evaluate on the remote server instead while also being able to use variables?
linux shell ssh
edited Nov 14 '18 at 22:53
jww
53.3k40229502
asked Nov 14 '18 at 11:13
mTvmTv
371213
Why the downvote?
– mTv
Nov 14 '18 at 11:17
Possible duplicate of Difference between single and double quotes in Bash
– Ipor Sircer
Nov 14 '18 at 11:30
Not a duplicate. I know the difference. I just want something in between. Think i figured it out myself though.
– mTv
Nov 14 '18 at 11:45
Your "solution" leaves$SCRIPT_VARunquoted, which may break your command if it contains whitespace.
– chepner
Nov 14 '18 at 15:26
Please place answers in Answer blocks. Later, you can accept your own Answer. Also see How does accepting an answer work?
– jww
Nov 14 '18 at 22:54
add a comment |
I have a shell script that runs a docker container on a remote server.
I'm trying to send the hostname of the remote server into the container but i just get the hostname of my local computer where i run the script.
The command looks like this in the script:
ssh $remote "docker run -h '`hostname`'
-e 'VARIABLE=$SCRIPT_VAR'
-e 'HOST_HOSTNAME=`hostname`'
..."
Both hostname and the environment variable host.hostname becomes the name of my local computer.
I know I can use singlequotes like this:
ssh $remote 'echo "`hostname`"'
and it will work. But then i cannot use scriptvariables like the $SCRIPT_VAR
How can i get it to evaluate on the remote server instead while also being able to use variables?
linux shell ssh
edited Nov 14 '18 at 22:53
jww
53.3k40229502
asked Nov 14 '18 at 11:13
mTvmTv
371213
I have a shell script that runs a docker container on a remote server.
I'm trying to send the hostname of the remote server into the container but i just get the hostname of my local computer where i run the script.
The command looks like this in the script:
ssh $remote "docker run -h '`hostname`'
-e 'VARIABLE=$SCRIPT_VAR'
-e 'HOST_HOSTNAME=`hostname`'
..."
Both hostname and the environment variable host.hostname becomes the name of my local computer.
I know I can use singlequotes like this:
ssh $remote 'echo "`hostname`"'
and it will work. But then i cannot use scriptvariables like the $SCRIPT_VAR
How can i get it to evaluate on the remote server instead while also being able to use variables?
linux shell ssh
linux shell ssh
edited Nov 14 '18 at 22:53
jww
53.3k40229502
asked Nov 14 '18 at 11:13
mTvmTv
371213
edited Nov 14 '18 at 22:53
jww
53.3k40229502
asked Nov 14 '18 at 11:13
mTvmTv
371213
edited Nov 14 '18 at 22:53
jww
53.3k40229502
edited Nov 14 '18 at 22:53
jww
53.3k40229502
edited Nov 14 '18 at 22:53
jww
53.3k40229502
53.3k40229502
asked Nov 14 '18 at 11:13
mTvmTv
371213
asked Nov 14 '18 at 11:13
mTvmTv
371213
asked Nov 14 '18 at 11:13
mTvmTv
371213
371213
Why the downvote?
– mTv
Nov 14 '18 at 11:17
Possible duplicate of Difference between single and double quotes in Bash
– Ipor Sircer
Nov 14 '18 at 11:30
Not a duplicate. I know the difference. I just want something in between. Think i figured it out myself though.
– mTv
Nov 14 '18 at 11:45
Your "solution" leaves$SCRIPT_VARunquoted, which may break your command if it contains whitespace.
– chepner
Nov 14 '18 at 15:26
Please place answers in Answer blocks. Later, you can accept your own Answer. Also see How does accepting an answer work?
– jww
Nov 14 '18 at 22:54
add a comment |
Why the downvote?
– mTv
Nov 14 '18 at 11:17
Possible duplicate of Difference between single and double quotes in Bash
– Ipor Sircer
Nov 14 '18 at 11:30
Not a duplicate. I know the difference. I just want something in between. Think i figured it out myself though.
– mTv
Nov 14 '18 at 11:45
Your "solution" leaves$SCRIPT_VARunquoted, which may break your command if it contains whitespace.
– chepner
Nov 14 '18 at 15:26
Please place answers in Answer blocks. Later, you can accept your own Answer. Also see How does accepting an answer work?
– jww
Nov 14 '18 at 22:54
Why the downvote?
– mTv
Nov 14 '18 at 11:17
Why the downvote?
– mTv
Nov 14 '18 at 11:17
Possible duplicate of Difference between single and double quotes in Bash
– Ipor Sircer
Nov 14 '18 at 11:30
Possible duplicate of Difference between single and double quotes in Bash
– Ipor Sircer
Nov 14 '18 at 11:30
Not a duplicate. I know the difference. I just want something in between. Think i figured it out myself though.
– mTv
Nov 14 '18 at 11:45
Not a duplicate. I know the difference. I just want something in between. Think i figured it out myself though.
– mTv
Nov 14 '18 at 11:45
Your "solution" leaves
$SCRIPT_VAR unquoted, which may break your command if it contains whitespace.– chepner
Nov 14 '18 at 15:26
Your "solution" leaves
$SCRIPT_VAR unquoted, which may break your command if it contains whitespace.– chepner
Nov 14 '18 at 15:26
Please place answers in Answer blocks. Later, you can accept your own Answer. Also see How does accepting an answer work?
– jww
Nov 14 '18 at 22:54
Please place answers in Answer blocks. Later, you can accept your own Answer. Also see How does accepting an answer work?
– jww
Nov 14 '18 at 22:54
add a comment |
1 Answer
1
active
oldest
votes
You still need to ensure that the expansion of $SCRIPT_VAR is quoted to prevent it from being subjected to word splitting or pathname expansion.
ssh $remote 'docker run -h "$(hostname)"
-e "VARIABLE='"$SCRIPT_VAR"'"
-e "HOST_HOSTNAME=$(hostname)"
...'
answered Nov 14 '18 at 15:30
chepnerchepner
251k33236331
add a comment |
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1 Answer
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1 Answer
1
active
oldest
votes
active
oldest
votes
active
oldest
votes
You still need to ensure that the expansion of $SCRIPT_VAR is quoted to prevent it from being subjected to word splitting or pathname expansion.
ssh $remote 'docker run -h "$(hostname)"
-e "VARIABLE='"$SCRIPT_VAR"'"
-e "HOST_HOSTNAME=$(hostname)"
...'
answered Nov 14 '18 at 15:30
chepnerchepner
251k33236331
add a comment |
You still need to ensure that the expansion of $SCRIPT_VAR is quoted to prevent it from being subjected to word splitting or pathname expansion.
ssh $remote 'docker run -h "$(hostname)"
-e "VARIABLE='"$SCRIPT_VAR"'"
-e "HOST_HOSTNAME=$(hostname)"
...'
answered Nov 14 '18 at 15:30
chepnerchepner
251k33236331
add a comment |
You still need to ensure that the expansion of $SCRIPT_VAR is quoted to prevent it from being subjected to word splitting or pathname expansion.
ssh $remote 'docker run -h "$(hostname)"
-e "VARIABLE='"$SCRIPT_VAR"'"
-e "HOST_HOSTNAME=$(hostname)"
...'
answered Nov 14 '18 at 15:30
chepnerchepner
251k33236331
You still need to ensure that the expansion of $SCRIPT_VAR is quoted to prevent it from being subjected to word splitting or pathname expansion.
ssh $remote 'docker run -h "$(hostname)"
-e "VARIABLE='"$SCRIPT_VAR"'"
-e "HOST_HOSTNAME=$(hostname)"
...'
answered Nov 14 '18 at 15:30
chepnerchepner
251k33236331
answered Nov 14 '18 at 15:30
chepnerchepner
251k33236331
answered Nov 14 '18 at 15:30
chepnerchepner
251k33236331
answered Nov 14 '18 at 15:30
chepnerchepner
251k33236331
251k33236331
add a comment |
add a comment |
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Why the downvote?
– mTv
Nov 14 '18 at 11:17
Possible duplicate of Difference between single and double quotes in Bash
– Ipor Sircer
Nov 14 '18 at 11:30
Not a duplicate. I know the difference. I just want something in between. Think i figured it out myself though.
– mTv
Nov 14 '18 at 11:45
Your "solution" leaves
$SCRIPT_VARunquoted, which may break your command if it contains whitespace.– chepner
Nov 14 '18 at 15:26
Please place answers in Answer blocks. Later, you can accept your own Answer. Also see How does accepting an answer work?
– jww
Nov 14 '18 at 22:54