environment variables

Unix / Linux: Maximum Character Length of Arguments In a Shell Command

What is the maximum character length of arguments in a shell command? How do I find out the maximum length of arguments for a new process under Linux or Unix like operating systems?
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Linux / Unix Shell: Set Default Printer

How do I set default printer in my Bash shell under CentOS Linux or FreeBSD unix desktop operating systems?
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Linux Set Environment Variable Command Tutorial

Bash shell is used for various purposes under Linux. How do I customize the shell environment variable under Linux operating systems? How can I set and view environment variable on Linux?
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Explains: echo Command (echo $”string”) Double-quoted String Preceded By a Dollar Sign

I noticed that many shell scripts in /etc/init.d/ directory use the following syntax:

echo $“Usage $prog start|stop|reload|restart”

Why a double-quoted string preceded by a dollar sign ($”string”) using the echo command under Linux / UNIX bash scripts?
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Unix / Linux: TCSH / CSH Shell Set Variable

How do I set environment variables using c shell (tcsh or csh) under FreeBSD UNIX or Linux operating systems? How do I save variable using csh shell under Unix like operating systems?
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UNIX: Set Environment Variable

How do I set environment variables on UNIX systems?
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FreeBSD csh / tcsh – Export Shell Variable

I am using FreeBSD version 7.x/8.x/9.x/10.x/11.x/12.x with csh (c shell) or tcsh. How do I export tcsh/csh shell variable under FreeBSD operating systems?
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