Advanced Bash−Scripting Guide

$EDITOR
the default editor invoked by a script, usually vi or emacs.
$EUID
"effective" user id number
Identification number of whatever identity the current user has assumed, perhaps by means of su.
The $EUID is not necessarily the same as the $UID.
$FUNCNAME
name of the current function
xyz23 ()
{
echo "$FUNCNAME now executing." # xyz23 now executing.
}
xyz23
Advanced Bash−Scripting Guide
echo "FUNCNAME = $FUNCNAME" # FUNCNAME =
# Null value outside a function.
$GLOBIGNORE
A list of filename patterns to be excluded from matching in globbing.
$GROUPS
groups current user belongs to
This is a listing (array) of the group id numbers for current user, as recorded in /etc/passwd.
root# echo $GROUPS
0
root# echo ${GROUPS[1]}
1
root# echo ${GROUPS[5]}
6
$HOME
home directory of the user, usually /home/username (see Example 9−13)
$HOSTNAME
The hostname command assigns the system name at bootup in an init script. However, the
gethostname() function sets the Bash internal variable $HOSTNAME. See also Example 9−13.
$HOSTTYPE
host type
Like $MACHTYPE, identifies the system hardware.
$IFS
bash$ echo $HOSTTYPE
i686
input field separator
Chapter 9. Variables Revisited 65