My below script is not giving the correct java version from the remote server, instead prints the version of the source server:
for i in 'cat serverlist.txt'
do
ssh $i `java -version 2>&1 >/dev/null | grep 'java version' | awk '{print $3}'|sed 's/"//g'`
done >>sample.txt
cat sample.txt
expected result would like below:
eg: 1.8.181 (each server would be having a different version, that shud be printed)
You shouldn't be using back ticks in remote command - single quotes are probably what you're looking for:
ssh $i 'java -version 2>&1 >/dev/null | grep "version" | cut -d" " -f 3-'
I am able to get my results correctly after trying the below:
ssh $server >sample.txt 2>&1 java -version 2>&1 >/dev/null | grep 'java version' | awk '{print $3}'|sed 's/"//g' >>s1.txt exit; cat s1.txt
Related
I want to preface that I am a newbie that picked up shell scripting 2 weeks ago.
Hey guys I need help with something, hope someone can point me in the right direction. I have a script that works when I run it from the command line but every time I run it with a crontab, the output is a few empty files. Does anyone know why?
That's the code down there
#!/bin/bash
#Provide an IP address as an argument to use nmap
#make sure to add the full range with (0-225 or 0/24) at the end
IPADDRESS=$(hostname -I | awk '{print $1}')
network-scan(){
if [ $1 ]
then
sudo nmap -sn $1
else
sudo nmap -sn 192.168.1.0-255
fi
}
#Scan the whole network and only prints the IP addresses minus your own
#Sends the IP addresses to a file
network-scan | grep -i 'Nmap scan report' | \
sed 's/\ /\n/g'|sed 's/(//g'|sed 's/)//g' | \
grep '[0-9]*\.[0-9]*\.[0-9]*\.[0-9]*' | grep -v ${IPADDRESS} > ip_addresses
#Scan the whole network and only prints the MAC addresses
#Sends the MAC addresses to a file
network-scan | grep -i 'MAC Address:' | \
awk '{print $3}' > mac_addresses
#Put the IP and MAC addresses in the same file
paste ip_addresses mac_addresses | \
column -s $'\t' -t > "scan_$(date +%d-%m-%Y_%H:%M:%S)"
#Notify that a file with the IP and MAC addresses has been created on the Desktop
echo "A file containing the results of the scan has been created on the Desktop"
exit 0
You are using
network-scan | grep
without passing any parameter.
Hence network-scan function always using
sudo nmap -sn 192.168.1.0-255
when you run it from command line are you passing any parameter ?
echo $IPADDRESS inside the script when executing at cron and at command line for debugging.
network-scan | grep -i 'Nmap scan report' | \
sed 's/\ /\n/g'|sed 's/(//g'|sed 's/)//g' | \
grep '[0-9]*\.[0-9]*\.[0-9]*\.[0-9]*' | grep -v ${IPADDRESS}
Since you are obtaining empty output, validate each command and append(test) each OR operators to know where it is removing required output.
I'm working on a script, that should find certain disks and add hostname to them.
I'm using this for 40 servers with a for loop in bash
#!/bin/bash
for i in myservers{1..40}
do ssh user#$i findmnt -o SIZE,TARGET -n -l |
grep '1.8T\|1.6T\|1.7T' |
sed 's/^[ \t]*//' |
cut -d ' ' -f 2 |
awk -v HOSTNAME=$HOSTNAME '{print HOSTNAME ":" $0}'; done |
tee sorted.log
can you help out with the quoting here? It looks like awk gets piped (hostname) from localhost, not the remote server.
Everything after the first pipe is running locally, not on the remote server.
Try quoting the entire pipeline to have it run on the remote server:
#!/bin/bash
for i in myservers{1..40}
do ssh user#$i "findmnt -o SIZE,TARGET -n -l |
sed 's/^[ \t]*//' |
cut -d ' ' -f 2 |
awk -v HOSTNAME=\$HOSTNAME '{print HOSTNAME \":\" \$0}'" ;
done | tee sorted.log
This is a shorter version of your stuff:
findmnt -o SIZE,TARGET -n -l |
awk -v HOSTNAME=$HOSTNAME '/M/{print HOSTNAME ":" $2}'
Applied to the above:
for i in myservers{1..40}
do ssh user#$i bash -c '
findmnt -o SIZE,TARGET -n -l |
awk -v HOSTNAME=$HOSTNAME '"'"'/M/{print HOSTNAME ":" $2}'"'"' '
done |
tee sorted.log
see: How to escape the single quote character in an ssh / remote bash command?
I am trying to kill all the existing processes before checkout the code and build it, in order to do, I am using the below command.
sudo ps -ef | grep 'dotnet' | grep -v grep | awk '{print $2}' | xargs -r kill -9;
This is working fine when I run it in the server manually. whereas, using in the jenkins pipeline as Execute Shell script, its not working.
Here is the jenkin's output
**-----------
[CICD] $ /bin/sh -xe /tmp/jenkins6283168714008394634.sh
+ ps -ef
+ grep dotnet
+ grep -v grep
+ + awk {print $2}xargs
-r kill -9
Failed build for hudson.tasks.Shell#178f47d3
**------------
Can someone please help?
I want to kill process on remote machines via ssh but its not working
VAR=$(ssh ${HOSTS} ps -ef | grep $SERVICE | grep -v grep | awk '{print $2}' | xargs kill -9)
ssh ${HOSTS} ps ef < /dev/null > /dev/null 2> /dev/null
The problem is that your pipe process get execute on your local host rather than on the server.
A solution is to quote protect the command:
VAR=$(ssh ${HOSTS} "ps -ef | grep $SERVICE | grep -v grep | awk '{print \$2}' | xargs kill -9")
ssh ${HOSTS} "ps ef" < /dev/null > /dev/null 2> /dev/null
Below command worked well for me to kill processes on remove server.
I'm able to kill tail command running on remote server.
ssh -tty ${Host}" ps -efwww | grep tail |grep -v grep |cut -c 10-15|xargs kill -9 "
I am writing a script using Fabric which needs to terminate a process remotely.
(this means that the command ends up getting executed as /bin/bash command)
The current code I have is the following:
in a kill.sh file i have
/bin/kill $(ps -ef | grep multiserver.jar | grep -v bin/sh | grep -v /bin/bash | grep -v sh | grep python | grep -v /usr/bin/java | grep -v /usr/bin/python | grep -v sh | awk '{print $2}')
which I run in Fabric on my remote host using the following commands
local("scp " + "kill.sh " + user +"#" + server_address + ":" + directory)
run ("chmod u+x kill.sh")
run("./kill.sh")
However I get the following error message
out: Usage:
[] out: kill [options] <pid> [...]
Fatal error: run() received nonzero return code 1 while executing!
Requested: ./kill.sh
Executed: /bin/bash -l -c "cd ... && ./kill.sh"
Does anyone know what I am doing wrong?
While solving this issue with reading logs with fabric, I wrote command to kill remote processes:
with settings(warn_only=True):
sudo("kill -9 `ps aux | <pipeline of greps> | awk '{print $2}'`")
Hope this helps.