How to sed remove last character from each line

I need to remove the last character from a line and shell variable such as "${_allowed_ips}". For example, each line is as follows in my file:
foo,
bar,
demo,
I need output as follows:
foo
bar
demo.
How can I use sed to delete the last character?

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How to save terminal output to a file under Linux/Unix

How do I save the terminal output to a file when using BASH/KSH/CSH/TCSH under Linux, macOS, *BSD or Unix-like operating systems?

The post How to save terminal output to a file under Linux/Unix appeared first on nixCraft.

Check if a directory exists in Linux or Unix shell

I need to check if a directory exists or not, within a shell script running on Linux or Unix-like system? How do I check if a directory exists in a shell script?

The post Check if a directory exists in Linux or Unix shell appeared first on nixCraft.

Bash shell find out if a variable has NULL value OR not

I am a new to shell scripting. How do I check for NULL value in a Linux or Unix shell scripts?

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