Archives for Linux
How to get process ID of background process?
I usually prefer to execute process in background so that we don't need to worry if terminal got killed due to timeout or accidently. However, what if you want to…
How to check certificate validity in Linux?
This article help you to check certificate expiry date from Linux command line using openssl utility. Check SSL certificate expiration date Syntax: openssl x509 -enddate -noout -in <certificate name> openssl…
Could not resolve host: mirrorlist.centos.org Centos 7
I have installed Centos 7 in Vmware WorkStation. I tried to install few new packages using yum install. However, I was getting error "Could not resolve host: Centos 7" [root@localhost…
How to Split String with a Delimiter in Shell Script
Split String with a Delimiter in Shell Script You can use Internal Field Separator (IFS) variable in shell script to split string into array. When we set IFS variable then…
How to validate date format in shell script
How to validate date format in shell script There are multiple ways you can validate date format in shell script. You can compare date format with regular expression or you…
Loop through a date range in Shell Script
Loop through a date range in Shell Script Here is a simple shell script which accept two date value as argument and perform desired action for date value in #!/usr/bin/bash…
Pass date as mandatory arguments in bash script
Pass date as mandatory arguments in bash script I came across a use case where I have to write a shell script to perform some action on two date ranges.…
How to define multiline string variable in shell?
How to define multiline string variable in shell? In your bash/shell scripting experience you may face scenario where you need to define multi line string variable. Here is multiple ways…
How to run multiple bash scripts in parallel
If you working as a Linux administrator or as a DevOps engineer then you might get a use case where you need to run multiple bash scripts in parallel without…
Get the last ten business days in a Unix shell script
Shell script to get the last 10 weekdays and run some task for each date over an element array. #!/usr/bin/bash n=10 today=$(date +'%Y-%m-%d') for ((d=1; n>0; d++)) do # Adjust…
