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The Linux Command Line

• The book spells Vim wrong (joke).
  • nano ~/.bashrc should be vim ~/.bashrc.
• groff + sed = "Log off and go to bed."

Bash man page.

• Shell grammar.
  
  • This section describes the syntax of the various forms of shell commands.
    

DEFINITIONS.

The following definitions are used throughout the rest of this
document.
blank  A space or tab.
word   A sequence of characters considered as a single unit by
       the shell.  Also known as a token.
name   A word consisting only of alphanumeric characters and
       underscores, and beginning with an alphabetic character or
       an underscore.  Also referred to as an identifier.
metacharacter
       A character that, when unquoted, separates words.  One of
       the following:
       |  & ; ( ) < > space tab newline
control operator
       A token that performs a control function.  It is one of
       the following symbols:
       || & && ; ;; ;& ;;& ( ) | |& <newline>

Lists.

 A list is a sequence of one or more pipelines separated by one of
 the operators ;, &, &&, or ||, and optionally terminated by one
 of ;, &, or <newline>.

ARITHMETIC EVALUATION.

((expression))
   - +    unary minus and plus
   * / %  multiplication, division, remainder
   + -    addition, subtraction
   <= >= < >
          comparison
   == !=  equality and inequality
   &&     logical AND
   ||     logical OR

CONDITIONAL EXPRESSIONS.

[[ expression ]]
Return a status of 0 or 1 depending on the evaluation of the conditional expression.
-a file, True if file exists.
-d file, True if file exists and is a directory.
-f file, True if file exists and is a regular file.

PARAMETERS (Positional Parameters & Special Parameters).

A parameter is an entity that stores values.

EXPANSION.

race expansion, tilde expansion, parameter and variable
expansion, command substitution, arithmetic expansion, word
splitting, and pathname expansion.

JOB CONTROL.

Job control refers to the ability to selectively stop (suspend)
the execution of processes and continue (resume) their execution
at a later point.

Title: 'The Linux Command Line'
License: creativecommons: Attribution-NonCommercial-NoDerivs 3.0 Unported 'CC BY-NC-ND 3.0'
Source(s):
linuxcommand: 'The Linux Command Line: Fifth Internet Edition' by William Shotts.
archive: 'The Linux Command Line Fifth Internet Edition' by William Shotts.

Title: bash Linux manual page.
License: Bash is Copyright (C) 1989-2022 by the Free Software Foundation, Inc.
Source(s):
man7: bash(1) — Linux manual page
man7: Linux manual pages: alphabetic list of all pages.