Hp NonStop G-Series Manual do Utilizador descarregar pdf (Página 48)

$ . ./.profile

Displaying the Values of Variables

You can display the value of any variable currently set in your shell. To display the value of a

single variable, use the echo command in the following general format:

echo $variable

The variable entry specifies the variable whose value you want displayed. For example, to

display the value of the SHELL environment variable, enter:

$ echo $SHELL

/bin/sh

To display the value of all currently set variables, use the set command without any options. The

following example lists the currently set values in the shell (your output may vary):

$ set

EDITOR=vi

HOME=/users/chang

LOGNAME=chang

PATH=:/bin:/bin/X11

PS1=$

SHELL=/bin/sh

TERM=xterm

Clearing the Values of Variables

You can remove the value of (clear) any current variable. The following variables, however, cannot

be cleared:

• PATH

• PS1

• PS2

• IFS

You clear currently set variables with the unset command. The general format for the unset

command is the following:

unset name

The name entry specifies the name of the variable to be cleared. For example, suppose you have

created a variable called place and have assigned it a value of U. S. A. To clear the variable,

enter the following:

$ unset $place

Example .profile File

The following features are commonly set in .profile:

• Terminal characteristics

• Search path and other environment variables

• Shell variables

• Maximum permissions for new files with umask

48 The OSS Shell

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Hp NonStop G-Series Manual do Utilizador Página 48