5.5.2 Shell variables whose values are set by the user

CDPATH

Specifies a candidate path for a search when the target directory specified in the cd command does not exist under the work directory.

ENV

• Windows and Linux only

  If YES is specified in the KSH_ENV_READ parameter or the parameter is omitted, this variable specifies the name of the .env file to be loaded when the shell starts.

• AIX, HP-UX, and Solaris only

  If YES is specified in the KSH_ENV_READ parameter, this variable specifies the name of the .env file to be loaded when the shell starts.

FPATH

Specifies the directory that stores the function definition file. The specified directory is searched when the preload functionality is enabled for a referenced function or the function to be executed is undefined. The variable reads the contents of the file with the same name as the function name, defines the function in the current environment, and then executes it.

HOME

Specifies the home directory.

IFS

Abbreviation of Internal Field Separator. The specified characters are used as string separators. The first characters in IFS, $*, are used to separate arguments for substitution. The initial values are the space, tab, and end-of-line characters.

PATH

Specifies a command search path.

PS4

Specifies the prompt character string placed at the beginning of each line when the xtrace shell option is enabled. The initial value is +.

SHELL

Specifies the path name of a shell that is retained during shell execution.

TMPDIR

Changing this shell variable has no effect on temporary files because all temporary files are created in the directory specified in the TEMP_FILE_DIR environment setting parameter.