Mixing
How do I parse the remote server name inside echo when executing over ssh
I know the title is a bit confusing but there is no other way.
Script runs and connects to remote server over ssh. This is going to run on 500 servers thatswhy I 'd like to have an output like this on the console.
echo " checking $hostname" or echo " checking ${hostname}" returns nothing.
echo " checking $(hostname)" returns the hostname of the local server ironically.
ssh $Server /bin/bash <<EOF
install some software
echo "checking <remote-server-name> after installation"
java -version
groovy -v
jruby -v
EOF
I was just curious if this is doable actually.
Thanx in advance.
ssh echo eof hostname
asked Nov 19 '18 at 19:44
DimiDakDimiDak
535410
add a comment |
I know the title is a bit confusing but there is no other way.
Script runs and connects to remote server over ssh. This is going to run on 500 servers thatswhy I 'd like to have an output like this on the console.
echo " checking $hostname" or echo " checking ${hostname}" returns nothing.
echo " checking $(hostname)" returns the hostname of the local server ironically.
ssh $Server /bin/bash <<EOF
install some software
echo "checking <remote-server-name> after installation"
java -version
groovy -v
jruby -v
EOF
I was just curious if this is doable actually.
Thanx in advance.
ssh echo eof hostname
asked Nov 19 '18 at 19:44
DimiDakDimiDak
535410
add a comment |
I know the title is a bit confusing but there is no other way.
Script runs and connects to remote server over ssh. This is going to run on 500 servers thatswhy I 'd like to have an output like this on the console.
echo " checking $hostname" or echo " checking ${hostname}" returns nothing.
echo " checking $(hostname)" returns the hostname of the local server ironically.
ssh $Server /bin/bash <<EOF
install some software
echo "checking <remote-server-name> after installation"
java -version
groovy -v
jruby -v
EOF
I was just curious if this is doable actually.
Thanx in advance.
ssh echo eof hostname
asked Nov 19 '18 at 19:44
DimiDakDimiDak
535410
I know the title is a bit confusing but there is no other way.
Script runs and connects to remote server over ssh. This is going to run on 500 servers thatswhy I 'd like to have an output like this on the console.
echo " checking $hostname" or echo " checking ${hostname}" returns nothing.
echo " checking $(hostname)" returns the hostname of the local server ironically.
ssh $Server /bin/bash <<EOF
install some software
echo "checking <remote-server-name> after installation"
java -version
groovy -v
jruby -v
EOF
I was just curious if this is doable actually.
Thanx in advance.
ssh echo eof hostname
ssh echo eof hostname
asked Nov 19 '18 at 19:44
DimiDakDimiDak
535410
asked Nov 19 '18 at 19:44
DimiDakDimiDak
535410
edited Nov 20 '18 at 11:04
DimiDak
asked Nov 19 '18 at 19:44
DimiDakDimiDak
535410
asked Nov 19 '18 at 19:44
DimiDakDimiDak
535410
asked Nov 19 '18 at 19:44
DimiDakDimiDak
535410
535410
add a comment |
add a comment |
1 Answer
1
active
oldest
votes
echo " checking $hostname" or echo " checking ${hostname}" returns nothing.
That is expected. There is in general no such variable named hostname, so you wouldn't expect a result. There is however a HOSTNAME variable, but that's only half the problem.
echo " checking $(hostname)" returns the hostname of the local server ironically.
That's because when you use "here" document, as in
somecommand << EOF
...
EOF
The contents of the here document are evaluated for variable expansion before the input is fed to your command. This is exactly why the $(hostname) construct is executing the hostname command on your local system.
You can inhibit the evaluation of the here document by quoting your end marker with single quotes, like this:
ssh $Server /bin/bash <<'EOF'
install some software
echo "checking $HOSTNAME after installation"
java -version
groovy -v
jruby -v
EOF
answered Nov 20 '18 at 12:25
larskslarsks
114k19187195
Wow, great answer man, thanx. Not that I'm a Bash-Guru but I have the feeling that no matter how much you learn, bash remains a mystery... Cheers, Dimi
– DimiDak
Nov 20 '18 at 15:34
add a comment |
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1 Answer
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active
oldest
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1 Answer
1
active
oldest
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active
oldest
votes
active
oldest
votes
echo " checking $hostname" or echo " checking ${hostname}" returns nothing.
That is expected. There is in general no such variable named hostname, so you wouldn't expect a result. There is however a HOSTNAME variable, but that's only half the problem.
echo " checking $(hostname)" returns the hostname of the local server ironically.
That's because when you use "here" document, as in
somecommand << EOF
...
EOF
The contents of the here document are evaluated for variable expansion before the input is fed to your command. This is exactly why the $(hostname) construct is executing the hostname command on your local system.
You can inhibit the evaluation of the here document by quoting your end marker with single quotes, like this:
ssh $Server /bin/bash <<'EOF'
install some software
echo "checking $HOSTNAME after installation"
java -version
groovy -v
jruby -v
EOF
answered Nov 20 '18 at 12:25
larskslarsks
114k19187195
Wow, great answer man, thanx. Not that I'm a Bash-Guru but I have the feeling that no matter how much you learn, bash remains a mystery... Cheers, Dimi
– DimiDak
Nov 20 '18 at 15:34
add a comment |
echo " checking $hostname" or echo " checking ${hostname}" returns nothing.
That is expected. There is in general no such variable named hostname, so you wouldn't expect a result. There is however a HOSTNAME variable, but that's only half the problem.
echo " checking $(hostname)" returns the hostname of the local server ironically.
That's because when you use "here" document, as in
somecommand << EOF
...
EOF
The contents of the here document are evaluated for variable expansion before the input is fed to your command. This is exactly why the $(hostname) construct is executing the hostname command on your local system.
You can inhibit the evaluation of the here document by quoting your end marker with single quotes, like this:
ssh $Server /bin/bash <<'EOF'
install some software
echo "checking $HOSTNAME after installation"
java -version
groovy -v
jruby -v
EOF
answered Nov 20 '18 at 12:25
larskslarsks
114k19187195
Wow, great answer man, thanx. Not that I'm a Bash-Guru but I have the feeling that no matter how much you learn, bash remains a mystery... Cheers, Dimi
– DimiDak
Nov 20 '18 at 15:34
add a comment |
echo " checking $hostname" or echo " checking ${hostname}" returns nothing.
That is expected. There is in general no such variable named hostname, so you wouldn't expect a result. There is however a HOSTNAME variable, but that's only half the problem.
echo " checking $(hostname)" returns the hostname of the local server ironically.
That's because when you use "here" document, as in
somecommand << EOF
...
EOF
The contents of the here document are evaluated for variable expansion before the input is fed to your command. This is exactly why the $(hostname) construct is executing the hostname command on your local system.
You can inhibit the evaluation of the here document by quoting your end marker with single quotes, like this:
ssh $Server /bin/bash <<'EOF'
install some software
echo "checking $HOSTNAME after installation"
java -version
groovy -v
jruby -v
EOF
answered Nov 20 '18 at 12:25
larskslarsks
114k19187195
echo " checking $hostname" or echo " checking ${hostname}" returns nothing.
That is expected. There is in general no such variable named hostname, so you wouldn't expect a result. There is however a HOSTNAME variable, but that's only half the problem.
echo " checking $(hostname)" returns the hostname of the local server ironically.
That's because when you use "here" document, as in
somecommand << EOF
...
EOF
The contents of the here document are evaluated for variable expansion before the input is fed to your command. This is exactly why the $(hostname) construct is executing the hostname command on your local system.
You can inhibit the evaluation of the here document by quoting your end marker with single quotes, like this:
ssh $Server /bin/bash <<'EOF'
install some software
echo "checking $HOSTNAME after installation"
java -version
groovy -v
jruby -v
EOF
answered Nov 20 '18 at 12:25
larskslarsks
114k19187195
answered Nov 20 '18 at 12:25
larskslarsks
114k19187195
answered Nov 20 '18 at 12:25
larskslarsks
114k19187195
answered Nov 20 '18 at 12:25
larskslarsks
114k19187195
114k19187195
Wow, great answer man, thanx. Not that I'm a Bash-Guru but I have the feeling that no matter how much you learn, bash remains a mystery... Cheers, Dimi
– DimiDak
Nov 20 '18 at 15:34
add a comment |
Wow, great answer man, thanx. Not that I'm a Bash-Guru but I have the feeling that no matter how much you learn, bash remains a mystery... Cheers, Dimi
– DimiDak
Nov 20 '18 at 15:34
Wow, great answer man, thanx. Not that I'm a Bash-Guru but I have the feeling that no matter how much you learn, bash remains a mystery... Cheers, Dimi
– DimiDak
Nov 20 '18 at 15:34
Wow, great answer man, thanx. Not that I'm a Bash-Guru but I have the feeling that no matter how much you learn, bash remains a mystery... Cheers, Dimi
– DimiDak
Nov 20 '18 at 15:34
add a comment |
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