Info Catalog bash: Shell Variables bash: Bash Variables

bash: Bourne Shell Variables

 
 5.1 Bourne Shell Variables
 ==========================
 
 Bash uses certain shell variables in the same way as the Bourne shell.
 In some cases, Bash assigns a default value to the variable.
 
 'CDPATH'
      A colon-separated list of directories used as a search path for the
      'cd' builtin command.
 
 'HOME'
      The current user's home directory; the default for the 'cd' builtin
      command.  The value of this variable is also used by tilde
      expansion (Tilde Expansion).
 
 'IFS'
      A list of characters that separate fields; used when the shell
      splits words as part of expansion.
 
 'MAIL'
      If this parameter is set to a filename or directory name and the
      'MAILPATH' variable is not set, Bash informs the user of the
      arrival of mail in the specified file or Maildir-format directory.
 
 'MAILPATH'
      A colon-separated list of filenames which the shell periodically
      checks for new mail.  Each list entry can specify the message that
      is printed when new mail arrives in the mail file by separating the
      filename from the message with a '?'.  When used in the text of the
      message, '$_' expands to the name of the current mail file.
 
 'OPTARG'
      The value of the last option argument processed by the 'getopts'
      builtin.
 
 'OPTIND'
      The index of the last option argument processed by the 'getopts'
      builtin.
 
 'PATH'
      A colon-separated list of directories in which the shell looks for
      commands.  A zero-length (null) directory name in the value of
      'PATH' indicates the current directory.  A null directory name may
      appear as two adjacent colons, or as an initial or trailing colon.
 
 'PS1'
      The primary prompt string.  The default value is '\s-\v\$ '.  
      Controlling the Prompt, for the complete list of escape sequences
      that are expanded before 'PS1' is displayed.
 
 'PS2'
      The secondary prompt string.  The default value is '> '.
 

Info Catalog bash: Shell Variables bash: Bash Variables