11-02-2017
What is the meaning the $ special character?
Hello... and thank you in advanced for any help anyone can offer me
I'm hoping someone can explain what the leading $ is/means (i.e. $PS1, $HOME, etc).... I was having a discussion with someone and was trying to explain it... Which I felt like I came up kind of short with how well I did it.
I understand it's a special character and how to use it if I want to see the value of a variable or if I want to see the status of a command... I'm just unsure what kind of special character its categorized as or the definition of it's exact function.
I got home and googled it... I found plenty of explanations on how to use it but didn't find an adequate explanation of what it is and it's definition. It seems like every special character is well documented except the $... Could someone explain to me how it's categorized and it's extract definition?
Once again... thanks for reading this and any help anyone can offer
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ENVIRON(5) File Formats Manual ENVIRON(5)
NAME
environ - user environment
SYNOPSIS
extern char **environ;
DESCRIPTION
An array of strings called the `environment' is made available by exec(2) when a process begins. By convention these strings have the form
`name=value'. The following names are used by various commands:
PATH The sequence of directory prefixes that sh, time, nice(1), etc., apply in searching for a file known by an incomplete path name.
The prefixes are separated by `:'. Login(1) sets PATH=:/bin:/usr/bin.
HOME A user's login directory, set by login(1) from the password file passwd(5).
TERM The kind of terminal for which output is to be prepared. This information is used by commands, such as nroff or plot(1), which may
exploit special terminal capabilities. See term(7) for a list of terminal types.
Further names may be placed in the environment by the export command and `name=value' arguments in sh(1), or by exec(2). It is unwise to
conflict with certain Shell variables that are frequently exported by `.profile' files: MAIL, PS1, PS2, IFS.
SEE ALSO
exec(2), sh(1), term(7), login(1)
ENVIRON(5)