perl: warning: Setting locale failed.
perl: warning: Please check that your locale settings:
 LANGUAGE = (unset),
 LC_ALL = (unset),
 LANG = "en_US.UTF-8"
    are supported and installed on your system.
perl: warning: Falling back to the standard locale ("C").
locale: Cannot set LC_CTYPE to default locale: No such file or directory
locale: Cannot set LC_MESSAGES to default locale: No such file or directory
locale: Cannot set LC_ALL to default locale: No such file or directory

[root@localhost ~]# locale
locale: Cannot set LC_CTYPE to default locale: No such file or directory
locale: Cannot set LC_MESSAGES to default locale: No such file or directory
locale: Cannot set LC_ALL to default locale: No such file or directory
LANG=en_US.eucKR
LC_CTYPE="en_US.eucKR"
LC_NUMERIC="en_US.eucKR"
LC_TIME="en_US.eucKR"
LC_COLLATE="en_US.eucKR"
LC_MonETARY="en_US.eucKR"
LC_MESSAGES="en_US.eucKR"
LC_PAPER="en_US.eucKR"
LC_NAME="en_US.eucKR"
LC_ADDRESS="en_US.eucKR"
LC_TELEPHonE="en_US.eucKR"
LC_MEASUREMENT="en_US.eucKR"
LC_IDENTIFICATION="en_US.eucKR"
LC_ALL=

[root@localhost ~]# export LANG=C
[root@localhost ~] # locale
LANG=C
LC_CTYPE="C"
LC_NUMERIC="C"
LC_TIME="C"
LC_COLLATE="C"
LC_MonETARY="C"
LC_MESSAGES="C"
LC_PAPER="C"
LC_NAME="C"
LC_ADDRESS="C"
LC_TELEPHonE="C"
LC_MEASUREMENT="C"
LC_IDENTIFICATION="C"
LC_ALL=