Bash Script to remotely collect hostname, IP and host total memory

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I am trying to write a scrip that will collect the hostname, IP and total memory installed on remote hosts from a list I feed into the script. The script will collect information from Redhat and Solaris machines.Below is what my script looks like:

#!/bin/bash
echo > ip_info.output
echo -e "n"
for host in `cat ip_adds`
do
echo "Hostname:" $host
sudo ssh -o BatchMode=yes -o ConnectTimeout=5 $host "echo IP Address:; ip route get 1 | awk 'print $NF;exit'; free -m | grep Mem | awk 'print $1,$2'"
echo -e "n"
done

When I run the script I get error below:

awk: print ,
awk: ^ syntax error
awk: print ,
awk: ^ syntax error
awk: cmd. line:1: print ,
awk: cmd. line:1: ^ unexpected newline or end of string

I think the problem is with free -m | grep Mem | awk 'print $1,$2 but not sure how to rectify it. If I run free -m | grep Mem | awk 'print $1,$2 directly into the shell I have no issues. Just inside the script.

edited 21 mins ago

Rui F Ribeiro

37.1k1273118

asked 59 mins ago

user315468

162

New contributor

What is the echo > ip_info.output doing?
â€“Â terdonâ™¦
37 mins ago

The echo > ip_info.output is writing nothing to the output file so that if I have to run the script again for whatever reason I dont end up with duplicate information.
â€“Â user315468
28 mins ago

Yes, but you don't seem to be using the output file anywhere, so I assume you're running the script as script.sh > ip_info.output, right?
â€“Â terdonâ™¦
24 mins ago

no Im running it as ./script.sh | tee -a ip_info.output. echo > ip_info.output clear the file for when ./script.sh | tee -a ip_info.output is run.
â€“Â user315468
17 mins ago

But if you want to clear the file, why would you use tee -a? There's no reason to use tee at all and certainly no reason to use tee -a. Just run ./script.sh > ip_info.output and that will always overwrite whatever is in the file.
â€“Â terdonâ™¦
16 mins ago

Â |Â
show 1 more comment

up vote
1
down vote

favorite

#!/bin/bash
echo > ip_info.output
echo -e "n"
for host in `cat ip_adds`
do
echo "Hostname:" $host
sudo ssh -o BatchMode=yes -o ConnectTimeout=5 $host "echo IP Address:; ip route get 1 | awk 'print $NF;exit'; free -m | grep Mem | awk 'print $1,$2'"
echo -e "n"
done

When I run the script I get error below:

awk: print ,
awk: ^ syntax error
awk: print ,
awk: ^ syntax error
awk: cmd. line:1: print ,
awk: cmd. line:1: ^ unexpected newline or end of string

edited 21 mins ago

Rui F Ribeiro

37.1k1273118

asked 59 mins ago

user315468

162

New contributor

What is the echo > ip_info.output doing?
â€“Â terdonâ™¦
37 mins ago

The echo > ip_info.output is writing nothing to the output file so that if I have to run the script again for whatever reason I dont end up with duplicate information.
â€“Â user315468
28 mins ago

Yes, but you don't seem to be using the output file anywhere, so I assume you're running the script as script.sh > ip_info.output, right?
â€“Â terdonâ™¦
24 mins ago

no Im running it as ./script.sh | tee -a ip_info.output. echo > ip_info.output clear the file for when ./script.sh | tee -a ip_info.output is run.
â€“Â user315468
17 mins ago

But if you want to clear the file, why would you use tee -a? There's no reason to use tee at all and certainly no reason to use tee -a. Just run ./script.sh > ip_info.output and that will always overwrite whatever is in the file.
â€“Â terdonâ™¦
16 mins ago

Â |Â
show 1 more comment

up vote
1
down vote

favorite

#!/bin/bash
echo > ip_info.output
echo -e "n"
for host in `cat ip_adds`
do
echo "Hostname:" $host
sudo ssh -o BatchMode=yes -o ConnectTimeout=5 $host "echo IP Address:; ip route get 1 | awk 'print $NF;exit'; free -m | grep Mem | awk 'print $1,$2'"
echo -e "n"
done

When I run the script I get error below:

awk: print ,
awk: ^ syntax error
awk: print ,
awk: ^ syntax error
awk: cmd. line:1: print ,
awk: cmd. line:1: ^ unexpected newline or end of string

edited 21 mins ago

Rui F Ribeiro

37.1k1273118

asked 59 mins ago

user315468

162

New contributor

#!/bin/bash
echo > ip_info.output
echo -e "n"
for host in `cat ip_adds`
do
echo "Hostname:" $host
sudo ssh -o BatchMode=yes -o ConnectTimeout=5 $host "echo IP Address:; ip route get 1 | awk 'print $NF;exit'; free -m | grep Mem | awk 'print $1,$2'"
echo -e "n"
done

When I run the script I get error below:

awk: print ,
awk: ^ syntax error
awk: print ,
awk: ^ syntax error
awk: cmd. line:1: print ,
awk: cmd. line:1: ^ unexpected newline or end of string

linux bash centos scripting rhel

edited 21 mins ago

Rui F Ribeiro

37.1k1273118

asked 59 mins ago

user315468

162

New contributor

edited 21 mins ago

Rui F Ribeiro

37.1k1273118

asked 59 mins ago

user315468

162

New contributor

edited 21 mins ago

Rui F Ribeiro

37.1k1273118

edited 21 mins ago

Rui F Ribeiro

37.1k1273118

edited 21 mins ago

Rui F Ribeiro

37.1k1273118

asked 59 mins ago

user315468

162

New contributor

asked 59 mins ago

user315468

162

asked 59 mins ago

user315468

162

New contributor

user315468 is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.

What is the echo > ip_info.output doing?
â€“Â terdonâ™¦
37 mins ago

The echo > ip_info.output is writing nothing to the output file so that if I have to run the script again for whatever reason I dont end up with duplicate information.
â€“Â user315468
28 mins ago

Yes, but you don't seem to be using the output file anywhere, so I assume you're running the script as script.sh > ip_info.output, right?
â€“Â terdonâ™¦
24 mins ago

no Im running it as ./script.sh | tee -a ip_info.output. echo > ip_info.output clear the file for when ./script.sh | tee -a ip_info.output is run.
â€“Â user315468
17 mins ago

But if you want to clear the file, why would you use tee -a? There's no reason to use tee at all and certainly no reason to use tee -a. Just run ./script.sh > ip_info.output and that will always overwrite whatever is in the file.
â€“Â terdonâ™¦
16 mins ago

Â |Â
show 1 more comment

What is the echo > ip_info.output doing?
â€“Â terdonâ™¦
37 mins ago

The echo > ip_info.output is writing nothing to the output file so that if I have to run the script again for whatever reason I dont end up with duplicate information.
â€“Â user315468
28 mins ago

Yes, but you don't seem to be using the output file anywhere, so I assume you're running the script as script.sh > ip_info.output, right?
â€“Â terdonâ™¦
24 mins ago

no Im running it as ./script.sh | tee -a ip_info.output. echo > ip_info.output clear the file for when ./script.sh | tee -a ip_info.output is run.
â€“Â user315468
17 mins ago

But if you want to clear the file, why would you use tee -a? There's no reason to use tee at all and certainly no reason to use tee -a. Just run ./script.sh > ip_info.output and that will always overwrite whatever is in the file.
â€“Â terdonâ™¦
16 mins ago

What is the echo > ip_info.output doing?
â€“Â terdonâ™¦
37 mins ago

The echo > ip_info.output is writing nothing to the output file so that if I have to run the script again for whatever reason I dont end up with duplicate information.
â€“Â user315468
28 mins ago

Yes, but you don't seem to be using the output file anywhere, so I assume you're running the script as script.sh > ip_info.output, right?
â€“Â terdonâ™¦
24 mins ago

no Im running it as ./script.sh | tee -a ip_info.output. echo > ip_info.output clear the file for when ./script.sh | tee -a ip_info.output is run.
â€“Â user315468
17 mins ago

But if you want to clear the file, why would you use tee -a? There's no reason to use tee at all and certainly no reason to use tee -a. Just run ./script.sh > ip_info.output and that will always overwrite whatever is in the file.
â€“Â terdonâ™¦
16 mins ago

Â |Â
show 1 more comment

2 Answers
2

active

oldest

votes

up vote
2
down vote

This is considerably more complicated than it needs to be. Also, why would you run ssh with sudo? If you need to log into the remote as root, then you can do that (ssh root@$host) but it's very unlikely you would need to run ssh with sudo unless your ssh keys all belonged to root. Which is a pretty bad idea.

Also, on my system, the command you seem to be using to get the IP returns the UID of my user:

$ ip route get 1
1.0.0.0 via 192.168.1.1 dev enp0s31f6 src 192.168.1.111 uid 1000 
 cache 
$ ip route get 1 | awk 'print $NF;exit'; 
1000

Don't you mean this?

$ ip route get 1 | awk 'print $(NF-2);exit'; 
192.168.1.111

The errors you saw were indeed because of quoting. Since you were running ssh $host "command", the double quotes around command cause the shell to expand any variables found inside the command (so things like awk's $2 etc). To avoid this and pass the symbols unexpanded to awk, you need to escape the $.

A simpler version of your script:

#!/bin/bash
sshOpts="BatchMode=yes -o ConnectTimeout=5"
echo > ip_info.output
echo "" 
while read host; do
 printf "Hostname:%s" $host
 ssh -o $sshOpts $host "printf 'Hostname: %snIP: %snMem: %sn' $host "$(ip route get 1 | awk 'print $(NF-2);exit')" "$(free -m | awk '/Mem/print $2')""
done < ip_adds

answered 22 mins ago

terdonâ™¦

124k29234412

add a commentÂ |Â

up vote
1
down vote

I have found an answer for this. It was to do with escaping so I added before $1 and $2 as per below:

free -m | grep Mem | awk 'print $1,$2

answered 42 mins ago

user315468

162

New contributor

add a commentÂ |Â

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2 Answers
2

active

oldest

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2 Answers
2

active

oldest

votes

up vote
2
down vote

Also, on my system, the command you seem to be using to get the IP returns the UID of my user:

$ ip route get 1
1.0.0.0 via 192.168.1.1 dev enp0s31f6 src 192.168.1.111 uid 1000 
 cache 
$ ip route get 1 | awk 'print $NF;exit'; 
1000

Don't you mean this?

$ ip route get 1 | awk 'print $(NF-2);exit'; 
192.168.1.111

A simpler version of your script:

#!/bin/bash
sshOpts="BatchMode=yes -o ConnectTimeout=5"
echo > ip_info.output
echo "" 
while read host; do
 printf "Hostname:%s" $host
 ssh -o $sshOpts $host "printf 'Hostname: %snIP: %snMem: %sn' $host "$(ip route get 1 | awk 'print $(NF-2);exit')" "$(free -m | awk '/Mem/print $2')""
done < ip_adds

answered 22 mins ago

terdonâ™¦

124k29234412

add a commentÂ |Â

up vote
2
down vote

Also, on my system, the command you seem to be using to get the IP returns the UID of my user:

$ ip route get 1
1.0.0.0 via 192.168.1.1 dev enp0s31f6 src 192.168.1.111 uid 1000 
 cache 
$ ip route get 1 | awk 'print $NF;exit'; 
1000

Don't you mean this?

$ ip route get 1 | awk 'print $(NF-2);exit'; 
192.168.1.111

A simpler version of your script:

#!/bin/bash
sshOpts="BatchMode=yes -o ConnectTimeout=5"
echo > ip_info.output
echo "" 
while read host; do
 printf "Hostname:%s" $host
 ssh -o $sshOpts $host "printf 'Hostname: %snIP: %snMem: %sn' $host "$(ip route get 1 | awk 'print $(NF-2);exit')" "$(free -m | awk '/Mem/print $2')""
done < ip_adds

answered 22 mins ago

terdonâ™¦

124k29234412

add a commentÂ |Â

up vote
2
down vote

Also, on my system, the command you seem to be using to get the IP returns the UID of my user:

$ ip route get 1
1.0.0.0 via 192.168.1.1 dev enp0s31f6 src 192.168.1.111 uid 1000 
 cache 
$ ip route get 1 | awk 'print $NF;exit'; 
1000

Don't you mean this?

$ ip route get 1 | awk 'print $(NF-2);exit'; 
192.168.1.111

A simpler version of your script:

#!/bin/bash
sshOpts="BatchMode=yes -o ConnectTimeout=5"
echo > ip_info.output
echo "" 
while read host; do
 printf "Hostname:%s" $host
 ssh -o $sshOpts $host "printf 'Hostname: %snIP: %snMem: %sn' $host "$(ip route get 1 | awk 'print $(NF-2);exit')" "$(free -m | awk '/Mem/print $2')""
done < ip_adds

answered 22 mins ago

terdonâ™¦

124k29234412

Also, on my system, the command you seem to be using to get the IP returns the UID of my user:

$ ip route get 1
1.0.0.0 via 192.168.1.1 dev enp0s31f6 src 192.168.1.111 uid 1000 
 cache 
$ ip route get 1 | awk 'print $NF;exit'; 
1000

Don't you mean this?

$ ip route get 1 | awk 'print $(NF-2);exit'; 
192.168.1.111

A simpler version of your script:

#!/bin/bash
sshOpts="BatchMode=yes -o ConnectTimeout=5"
echo > ip_info.output
echo "" 
while read host; do
 printf "Hostname:%s" $host
 ssh -o $sshOpts $host "printf 'Hostname: %snIP: %snMem: %sn' $host "$(ip route get 1 | awk 'print $(NF-2);exit')" "$(free -m | awk '/Mem/print $2')""
done < ip_adds

answered 22 mins ago

terdonâ™¦

124k29234412

answered 22 mins ago

terdonâ™¦

124k29234412

answered 22 mins ago

terdonâ™¦

124k29234412

answered 22 mins ago

terdonâ™¦

124k29234412

add a commentÂ |Â

up vote
1
down vote

I have found an answer for this. It was to do with escaping so I added before $1 and $2 as per below:

free -m | grep Mem | awk 'print $1,$2

answered 42 mins ago

user315468

162

New contributor

add a commentÂ |Â

up vote
1
down vote

I have found an answer for this. It was to do with escaping so I added before $1 and $2 as per below:

free -m | grep Mem | awk 'print $1,$2

answered 42 mins ago

user315468

162

New contributor

add a commentÂ |Â

up vote
1
down vote

I have found an answer for this. It was to do with escaping so I added before $1 and $2 as per below:

free -m | grep Mem | awk 'print $1,$2

answered 42 mins ago

user315468

162

New contributor

I have found an answer for this. It was to do with escaping so I added before $1 and $2 as per below:

free -m | grep Mem | awk 'print $1,$2

answered 42 mins ago

user315468

162

New contributor

answered 42 mins ago

user315468

162

New contributor

answered 42 mins ago

user315468

162

answered 42 mins ago

user315468

162

New contributor

user315468 is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.

add a commentÂ |Â

user315468 is a new contributor. Be nice, and check out our Code of Conduct.

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