====== Conditionals ======

Conditionals are the primary means of making decisions in programming, especially Bash scripting. Conditionals in Bash are with the ''%%[%%'' and ''%%[[%%'' built-ins, which are also commands! It makes reasoning about conditionals challenging at first, but there are some useful flags available:

===== Files =====

  ; ''-a //file//''
    : True if //file// exists.
  ; ''-b //file//''
    : True if //file// is an existing block device.
  ; ''-c //file//''
    : True if //file// is an existing character device
  ; ''-d //file//''
    : True if //file// is an existing directory.
  ; ''-e''
    : See ''-a''.
  ; ''-f //file//''
    : True if //file// is an existing normal file.
  ; ''-h //file//''
    : True if //file// is a symbolic link (symlink).
  ; ''-r //file//''
    : True if //file// exists and is readable.
  ; ''-s //file//''
    : True if //file// exists and has a size greater than 0.
  ; ''-w //file//''
    : True if //file// exists and is writable.
  ; ''-x //file//''
    : True if //file// exists and is executable.
    
===== Variables =====

  ; ''-v //arg//''
    : True if //arg// is a set variable. :!: **Bash 4.2+ only.**
    
===== References =====

  * ''[[man>bash|man bash]]'' — See "CONDITIONAL EXPRESSIONS"