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BASH Shell

How to get common name (CN) from SSL certificate using openssl command

I configured and installed a TLS/SSL certificate in /etc/ssl/ directory on Linux server. I was wondering if can I find out the common name (CN) from the certificate using the Linux or Unix command line option?
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How to find all hard links in a directory on Linux

I have a file named /etc/passwd i and I would like to find all hard links to this file in a directory. How do I find out all other hard links to the /etc/passwd in /backups/ directory? How can find all hard links to a given file using Linux or Unix command line option?
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How to open a file in vim in read-only mode on Linux/Unix

I need of opening necessary files in reading (read-only) mode to avoid accidental editing of files such as /etc/resolv.conf or a large config or programming file on a production server. How do I open files in read-only mode in vim text editor on Linux or Unix-like system?
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How to ignore invalid and self singed ssl connection errors with curl command

I wanted to curl command to ignore SSL certification warning. Does curl command have a --no-check-certificate option like wget command on Linux or Unix-like system?
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How to copy a single file to multiple directories in Linux or Unix

If I want to copy a single file into three locations (directories), by using a single cp command (e.g. cp file /dir1/ /dir2/ /dir3/. Would that be possible? If yes, please provide the command for GNU/Linux or Unix operating systems.
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How to check the file size in Linux/Unix bash shell scripting

I am a new bash shell scripting user. How do I find out the size of a file in my bash shell script and store this file size in a bash shell variable?
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Linux / Unix: “-bash: python: command not found” error and solution

I am a new user and trying to run Python program. I have a cloud based VM/VPS and when I type python mycode.py at the terminal of my server, I get the following error:
-bash: python: command not found

How do I solve this problem?
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Change Shell To Bash

How do I switch from a ksh shell to bash on Linux or Unix system? How to change shells on Unix-like system?
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How to assign a grep command value to a variable in Linux/Unix

How do I store grep command output in shell variable? What is the syntax to store the command output into a variable in Linux or Unix?
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How to change the screenshots save file location in MacOS X

I know how to capture my whole screen or just part of it. The screenshot is automatically saved to my desktop, and it is cluttering the entire desktop with .png screenshot files. How can I change where screenshots are saved on my MacOS X system instead of the default desktop location?
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