I'd like to change my script(s) so that the command output is separated by a comma and is all on one line per host. Any ideas on how I can achieve this:
1st Script:
#!/bin/bash
for i in `cat ~/hostnames.txt`
do
ssh -q $i 'bash -s' < server_info.sh
done
2nd Script (server_info.sh):
#!/bin/bash
echo -n "Name: "
uname -n
echo -n "CPUs: "
cat /proc/cpuinfo* | grep processor | wc -l
echo -n "Memory (kb): "
cat /proc/meminfo | grep MemTotal: | awk '{print $2}'
echo -n "Current Kernel: "
uname -a | awk '{print $3}'
echo -n "IP: "
hostname -i
echo -e
Changing your 1st script:
#!/bin/bash
for i in cat ~/hostnames.txt
do
ssh -q $i 'bash -s' < server_info.sh
done | awk -v RS= '{$1=$1}1'
Note: Your server_info.sh can be a lot more optimized.For example:
cat /proc/meminfo | grep MemTotal: | awk '{print $2}'
could be changed to:
awk '/MemTotal:/{print $2}' /proc/meminfo
Related
When ran commands locally on the remote server outputs would work as expected:
desired_kernel_version="5.4.0-105-generic"
cat /tmp/grb.bkp | grep GRUB_DEFAULT
GRUB_DEFAULT=0
kernel_position=$(awk -F\' '$1=="menuentry " || $1=="submenu " {print i++ " : " $2}; /\tmenuentry / {print "\t" i-1">"j++ " : " $2};' /boot/grub/grub.cfg | grep "${desired_kernel_version}" | grep -v recovery | awk '{ print $1}' | sed 's/ //g')
echo $k_position
1>2
sed -i "s/GRUB_DEFAULT=0/GRUB_DEFAULT=\"${k_position}\"/g" /tmp/grb.bkp
cat /tmp/grb.bkp | grep GRUB_DEFAULT
GRUB_DEFAULT="1>2"
desired output when ran from remote server:
replace 0 of GRUB_DEFAULT value to kernel_position within quotes.
server=abcd
kernel_position=$(ssh -qT $server awk -F\' '$1=="menuentry " || $1=="submenu " {print i++ " : " $2}; /\tmenuentry / {print "\t" i-1">"j++ " : " $2};' /boot/grub/grub.cfg | grep "${desired_kernel_version}" | grep -v recovery | awk '{ print $1}' | sed 's/ //g')
ssh -qT $server "sed -i "s/GRUB_DEFAULT=0/GRUB_DEFAULT=\"${k_position}\"/g" /tmp/grb.bkp"
Suggesting to avoid quoting hell.
Send muli-line command into ssh by writing a script remote-script.sh with all lines.
remote-script.sh
#!/bin/bash
source ~/.bash_profile
$k_position=$1
desired_kernel_version="5.4.0-105-generic"
cat /tmp/grb.bkp | grep GRUB_DEFAULT
GRUB_DEFAULT=0
kernel_position=$(awk -F\' '$1=="menuentry " || $1=="submenu " {print i++ " : " $2}; /\tmenuentry / {print "\t" i-1">"j++ " : " $2};' /boot/grub/grub.cfg | grep "${desired_kernel_version}" | grep -v recovery | awk '{ print $1}' | sed 's/ //g')
echo $k_position
1>2
sed -i "s/GRUB_DEFAULT=0/GRUB_DEFAULT=\"${k_position}\"/g" /tmp/grb.bkp
cat /tmp/grb.bkp | grep GRUB_DEFAULT
GRUB_DEFAULT="1>2"
Give current user execution permissions on remote-script.sh
chmod u+x remote-script.sh
Use scp command to copy remote-script.sh to $server. If possible only once at deploy time.
scp -q remote-script.sh $server:/home/your-user
Use ssh command to run remote-script.sh on remote server. Pass $k_position in command line.
ssh -qT $server "bash -c /home/your-user/remote-script.sh $k_position"
BTW, in computing kernel_position, suggesting to fold all awk, grep, sed commands into a single awk script.
When I run the below command on the terminal it's working fine.
$ var=`(time mysqldump -v -u'user' -p'password' database > db-backup.sql 2>
/tmp/mysqldump-output) 2>&1 | grep real | awk '{print $2}' | cut -f1 -d"m"`
$ echo $var
0
But when I use same command in the bash script it's not working properly
Below is script:
$ cat db-backup.sh
#!/bin/bash
var=`(time mysqldump -v -u'user' -p'password' database > database-backup.sql 2> /tmp/mysqldump-output) 2>&1 | grep real | awk '{print $2}' | cut -f1 -d"m"`
echo $var
script output:
$ sh -x db-backup.sh
+ grep real
+ awk {print $2}
+ cut -f1 -dm
+ var=
+ echo
After running the script with bash it worked.
$ bash -x db-backup.sh
++ grep real
++ awk '{print $2}'
++ cut -f1 -dm
+ var=0
+ echo 0
0
I have a task which asks to write a script which displays all partitions formatted with a specific file system, given as parameter.
I have written the script but when i run it it displays '0'. What am i doing wrong?
This is my code:
#!/bin/bash
n=sudo parted -l | tail -n +8 | awk '{print $5}' | wc | awk '{print $2}'
m=sudo parted -l | tail -n +8 | awk '{print $5}'
q=sudo parted -l | tail -n +8
for i in $n; do
if [ "[ $m | sed -n ip ]" = "$1" ]; then
echo "$q | sed -n ip"
fi
done
Different approach from yours, but does it do what you need?
lsblk -f | awk '$0 ~ fs {print $NF}' fs=ext2
Below is my code and I am able to get the ssh connection. But after that it is doing nothing.
log_time="date +%F\%T"
PR_ONE="username#hostname"
file="/home/log.txt"
to_list="myemail"
echo "`$log_time`" >> $file
`ssh $PR_ONE "echo df -hP | grep fs1 | awk '{print $4}'"` >> $file
cat $file | mailx -s "Disk space usages" $to_list
I am getting the email but only with $log_time. I know that I am doing something wrong in quotations in the ssh line.
I am new to shell scripting.
Try this :
echo "df -hP | grep fs1 | awk '{print $4}'" | ssh -tt $PR_ONE >> $file
or prefer this :
ssh -tt $PR_ONE << EOF >> $file
df -hP | grep fs1 | awk '{print $4}'
EOF
I have a tomcat server I am trying to get a list of info on for a project. I need to get the results from /etc/default/tomcat file. However some of my servers are tomcat6 and some are tomcat7 so hardcoding the filename is not going to work.
How would I dynamically insert the filename in this batch script.
#!/bin/bash
echo Server Name: `hostname`
echo CPU: `top -b -n1 | grep "Cpu(s)" | awk '{print $2 + $4}'`
FREE_DATA=`free -m | grep Mem`
CURRENT=`echo $FREE_DATA | cut -f3 -d' '`
TOTAL=`echo $FREE_DATA | cut -f2 -d' '`
echo Internal IP : `ifconfig eth0 2>/dev/null|awk '/inet addr:/ {print $2}'|sed 's/addr://'`
echo OS Memory: `cat /proc/meminfo | grep MemTotal | awk '{ print $2 }'`
echo Operating System: `uname -mrs`
***echo Tomcat Memory: `cat /etc/default/tomcat6 | grep Xmx | awk '{ print $5}'`***
Your last command can be simplified to single awk like this:
awk '/Xmx/{print "Tomcat Memory:", $5}' "$tomcatFile"
Pass "$tomcatFile" whatever tomcat filename from ver6 or ver7.
You can get output from both tomcat files in same command using:
awk '/Xmx/{print "Tomcat Memory:", $5}' /etc/default/tomcat[67]