All Questions
51 questions
0
votes
1
answer
150
views
How to get the jdk install path using shell programmatically when dual jdk are installed in RHEL?
I have a list of servers in which I need to find the jdk-8 install location programmatically. A few of the servers are having single jdk installation which makes it easier to find the install location ...
- 317
0
votes
0
answers
130
views
Rhel: Get machine ID and then replace it in file
I have machineid in /etc/machine-id
I want to replace string
id=machineid in file /var/somefile.conf
with the "new id".
How can I do this easy with one command line?
- 23
0
votes
1
answer
396
views
python3/bash + how to automate creation of disk partitions in Linux
here is example from our rhel server machine
lsblk
NAME MAJ:MIN RM SIZE RO TYPE MOUNTPOINT
sdb 8:16 0 20G 0 disk /data/sdb
sdc 8:32 0 20G 0 ...
- 1,871
0
votes
0
answers
326
views
Shell script execution is failed with error " No such file or directory"
I Have written a shell script which simply show the swap memory usages from processes.
I have executed the script at my end successfully, but when I share this with client to execute it is getting ...
- 21
1
vote
2
answers
627
views
Linux Bash, Test command, why [ 0 -ne 0 ] is false instead of true?
When using test command in Linux Bash and numeric comparison between "Zero" equal to "zero" fetches an exit code 0 through echo $?
$[ 0 -eq 0 ]
$echo $?
0
However, when testing ...
- 31
0
votes
1
answer
78
views
How to print list of strings in a pop up window and save the strings in a file with time stamp
When I run below script, it reads a report.txt file and whenever a message is matched in the file a pop up window will come with the message. How whiptail can be used out of for loop so that pop up ...
- 9
1
vote
1
answer
717
views
bash/shell - How do I get the group name of a directory on RHEL and save it to a variable?
I'm working on a script to create users and grant them access to a directory, but they have to be added to the group that has permissions on the directory. I noticed that if I do a stat on the ...
- 21
1
vote
0
answers
306
views
Unable to get Compliant state for OS policy assignment on GCP console
I created a RHEL7 VM and a OS Policy assignment with a simple config. Here is the YAML I'm using to validate. Below is the same shell script used in yaml for reference:
export num=$(stat --format '%a' ...
2
votes
0
answers
331
views
"ssh -q" pbrun exec last login still showing up even with .hushlogin
I'm running the below script on RHEL 7.9 and after connecting to the remote machine and execing pbrun, the last login message is getting displayed and sometimes it interferes with the command which is ...
- 21
1
vote
1
answer
2k
views
getting "grep: write error: pipe broken" when command executed through application installation
Below is the command which is executed when I install the application(this line written in one of the script of our application).
PASS=strings /dev/urandom | grep -o '[[:alnum:]]' | head -n 10 | tr -d ...
- 21
0
votes
2
answers
54
views
bash + how to set cli PATH with version in sub folder
Under /usr/hdp folder we can have only one the following sub-folders
2.6.5.0-292
2.6.4.0-91
2.6.0.3-8
example
ls /usr/hdp/
2.6.5.0-292 current stack file.txt
I want to use the following cli, and $...
- 2,570
0
votes
1
answer
56
views
Looping through awk command using bash in RHEL
I am trying to loop through the output of an awk command in bash. I saved the output to a variable and when I loop through, all of the output is saved as one long string instead of each one their own ...
4
votes
1
answer
849
views
How to find a YAML value from Bash using PyYAML
I'm testing the feasibility of using PyYAML v3.12 within a RHEL7 environment to parse the contents of moderately complex YAML config files, by feeding it a key and getting the keypair value back. The ...
0
votes
0
answers
251
views
Cannot create and write content in a file from shell script
I am creating a shell script on Linux machine. I am doing the following lines of code:
RESPONSE_FILE='/var/tmp/abc'
chmod 777 '/var/tmp'
chown root '/var/tmp'
touch $RESPONSE_FILE
logger "[INFO] ...
0
votes
2
answers
928
views
How to perform grep on curl within for loop?
I have created an array uisng the command IFS=', ' read -r -a array <<< "$(command)"
The array has values:
abc001
abc002
abc003
I want to loop through the array and run a curl command on ...
- 15.5k
0
votes
1
answer
207
views
How to fetch output of command into a variable? [duplicate]
I am trying to run a command and storing the values in a list
list = `sed -n 's/^abc//p' /etc/filename`
I am getting an error command not found while running the above command.
However, when I ...
- 15.5k
0
votes
2
answers
87
views
To exit out of the code if expect condition not met RHEL
I have written a small code using expect in Red Hat Linux 8 to check if a host is reachable using ICMP Ping. My intention is if the destination is not reachable , then the execution should break....
- 69
2
votes
1
answer
2k
views
How to use -regex in the find command on Linux command line
The objective is to find and list anything with "messages" and/or "error.log" etc.. in the beginning then list both "messages.1..99" and "error.log.1..99" using regular expressions.
This command ...
0
votes
1
answer
96
views
How can I extract the OS version of a remote VM and set it as an environment variable on the remote VM and also to use further in the expect script?
I am trying to fetch the OS version of a remote VM and add it as an environment variable on the same vm and also use the fetched value further on the host vm from where the expect script is being ...
- 45
0
votes
3
answers
953
views
How to simplify an if-else statement matching IP address
I have the following If-Else statement which I want to simplify.
if [[ "$IP" == 192.* ]] || [[ "$IPAddr" == 193.* ]]
then
data="correct data set"
fi
I need to include more of [[ "$IP" == 192.* ...
- 15.5k
0
votes
1
answer
1k
views
RHEL RPM spec post installation %post not sourcing shell script
I am trying to source a shell script in the root environment (as I am doing installation as root) after successful installation of a rpm in RHEL7.4 box
The rpm spec %post section is as follows:
%...
- 4,089
1
vote
2
answers
3k
views
Permanently set environment variables for Multiple users
Java build machine is on Redhat 7.5 to run mvn clean package deploy for building Java code.
Multiple users login with their username to this build machine, to build Java code.
To permanently set ...
1
vote
2
answers
3k
views
Shellscript to monitor a log file if keyword triggers then run the snmptrap command
Is there a way to monitor a log file using shell script like
tail -f /var/log/errorlog.txt then if something like down keyword appears, then generate SNMPTRAP to snmp manager and continues the ...
- 43
2
votes
1
answer
662
views
Efficient method to parse large number of files
I've incoming data which will be in range of 130GBs - 300GBs containing 1000's (maybe millions) of small .txt files of size 2KB - 1MB in a SINGLE folder. I want to parse them efficiently.
I'm looking ...
- 895
0
votes
1
answer
147
views
Discrepancy between df -h and ll -h returned information
everyone!
df -h shows that a disk is full (used 100%).
But when I use ll -htotal size of files almost 2%.
Can someone explain what happens?
- 666
1
vote
0
answers
286
views
cygwin xterm to open multi session from script
I have .ksh script with below commands to open multiple session on different server but not able to execute file parallel same time.any help ?
xterm -e ssh appuser@appserver1; cd /usr/bin/; ./...
- 15
1
vote
2
answers
181
views
How to run multiple, distinct Fortran scripts in parallel on RHEL 6.9
Let's say I have N Fortran executables and M cores on my machine, where N is greater than M. I want to be able to run these executables in parallel. I am using RHEL 6.9
I have used both OpenMP and ...
- 923
2
votes
2
answers
3k
views
Adding YUM Repos With Variables
I am trying to add a YUM repo from the command line like so
cat > /etc/yum.repos.d/my_stable_repo.repo << EOF
[my_stable_repo]
name=Stable Repo
baseurl='https://myurl/$releasever/stable/...
- 688
-1
votes
2
answers
3k
views
Why do I get 'permission denied' after using ./file2 in Linux? [duplicate]
For example I have a file named file2 that echoes something.
So in the shell, after typing this
# ./file2
It shows
Permission denied
Where am I wrong here?
- 111
0
votes
2
answers
1k
views
RHEL Environment Variable Path To Mongo Shell
I have installed mongodb in one of our environments & this has been done using MongoDb Operations Manager. Though i have my PATH variable set correctly i'm unable to connect mongo shell with my ...
- 1,191
7
votes
1
answer
243
views
Why bash4 expands curly braces differently?
One of legacy system got upgraded to bash4 and most of its scripts stopped working. I've narrowed it down to how a curly brackets are expanded within a <(cmdA ...|cmdB ... file{1,2}|cmdZ ...).
To ...
- 1,187
0
votes
1
answer
2k
views
How to select an option automatically from a prompt message in shell script?
when i run my script manually it prompts a message to select YES or NO . I am automating this part in shell scripting, how to automatically select YES
script.sh - if i run this it should take the ...
- 195
67
votes
6
answers
81k
views
Install ONLY mongo shell, not mongodb
As mentioned above, I need to install only the mongo shell on a RHEL instance (machine A).
I have a mongodb server on a separate instance (machine B) and need to connect to that from A to run ...
- 822
0
votes
1
answer
91
views
How to list a file by filename as a date?
I have list of filename which have format like this _ddmmyyyy.txt
for example :
filea_01122016.txt
filea_02122016.txt
filea_03122016.txt
filea_04122016.txt
filea_05122016.txt
And I want to compress ...
- 43
0
votes
0
answers
86
views
Trying to tee inside bash script works on RHEL 6.7 but not on RHEL 6.8
I have the following bash script:
#!/bin/bash
exec &> >(tee -a /tmp/file1.log)
echo "1"
echo "2"
echo "3"
It runs on a RHEL 6.7 host and what it does is to print 1 2 3 to both stdout and /...
- 139
1
vote
4
answers
5k
views
Bash: Read in file, edit line, output to new file
I am new to linux and new to scripting. I am working in a linux environment using bash. I need to do the following things:
1. read a txt file line by line
2. delete the first line
3. remove the middle ...
- 13
0
votes
1
answer
203
views
How to create a CLI that can interact with a continuously running service, similar to MySQL's shell?
I have a small application that needs to run continuously in the background. The program is able to setup directory monitoring services, HTTPS listeners, and other services that need to remain running ...
- 75
4
votes
2
answers
626
views
Restrict kill commands when running jar file using a shell script
I have a jar file which is a program which accept user input and processes it. I am running this jar file using the below shell script:
PR=`basename $0`
cdt=`date +'%H:%M:%S %d/%m/%Y'`
cd $HOME/...
- 171
1
vote
2
answers
14k
views
How to use amqsput command in shell script to push data into a queue?
I am using following command to push some data into a Message Queue.
amqsput QUEUE_NAME QUEUE_MANAGER_NAME
Then after console available I push my required data. (just shown in the screenshot, I will ...
- 3,504
0
votes
2
answers
700
views
How to find commands ran in a particular day from a particular username
I am able to find out from secure log that who logged in from where using ssh.
And the last command also proved that.
Is there any why to find out what were the commands run in that ssh session?
- 529
-1
votes
2
answers
166
views
get java installation path using shell script in rhel
I have to automate a process in which i need to install java on RHEL 7, using rpm package and then update the security jars later on the installed location. Once i execute the java rpm, how would i ...
- 41
0
votes
2
answers
748
views
redirect stdout and stderr to different file under sandboxing in linux
I have an Test.cpp which is run under sandbox(RHEL7):
Test.cpp content:
#include<stdio>
int main(void) {
int a = 1/0;
return 0;
}
compile it using gcc(4.8) Test.cpp which produces the a....
- 4,167
0
votes
2
answers
51
views
Scripts works fine in CentOS but not on RHEL5
Below script works fine on CentOS but not on RHEL5:
#!/bin/bash
read -p "enter your value:" ip
if [[ $ip =~ ^[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}$ ]]
then
echo "valid"
else
echo "invalid"
...
- 87
29
votes
2
answers
54k
views
why do I get "Suspended (tty output)" in one terminal but not in others?
Apparently I've done something strange/wrong in a tcsh shell, and now whenever I start an application in the background which prints to stdout the application is suspended (stopped). Weird thing is, ...
- 6,751
0
votes
2
answers
351
views
DSH (dancer's shell) hangs when getting tail -f logs
I'm using dancer's shell dsh (http://www.netfort.gr.jp/~dancer/software/dsh.html.en) to send a tail -f command to 6 machines. I was hoping to use this to view a merged log from a service which ...
- 853
1
vote
1
answer
4k
views
Unable to set just year with Linux date command [closed]
For some reason I fail to update year only using date command
date
Tue Mar 4 20:15:42 IST 2014
date '+%Y' -s '2013'
date
Tue Mar 4 20:13:01 IST 2014
I tried it on both RedHat and Ubuntu...
NTP ...
2
votes
1
answer
819
views
How to use environment variable declared in /etc/profie into script running through monit?
Environment variable declared in /etc/profile:
export MYNAME=rhel
Content of script which is running from monit is [/tmp/printmyname.sh]:
echo "My Name is: "$MYNAME >> /var/log/...
- 35
-1
votes
1
answer
40
views
Im stuck in RHEL 6.3
What about ??
if -f $LOCAL_EVENT_LOG_FTP_TEMP del $LOCAL_EVENT_LOG_FTP_TEMP
else
echo Event Log Backup Module not Activated.
fi;
Is there any mistakes?
- 17
0
votes
1
answer
232
views
RHEL 6.3 shell scripting
What is wrong with this?
if [ ! -d "$LOCAL_WORKING_DIR" ]
then
mkdir "$LOCAL_WORKING_DIR"
cd "$LOCAL_WORKING_DIR"
else
cd"$LOCAL_WORKING_DIR"
fi
Errors : syntax error near ...
- 17
-2
votes
1
answer
882
views
I just started learning Scripting in Shell Script, RHEL 6.3 [duplicate]
How to write in Terminal RHEL 6.3 in a proper way?
If not exist LOCAL_WORKING_DIR LOCAL_EVENT_LOG_WORKING_DIR
mkdir LOCAL_WORKING_DIR LOCAL_EVENT_LOG_WORKING_DIR ????
I have tried with this but ...
- 17