#!/bin/bash
# ½ºÅ©¸³Æ® ½ÃÀۺκÐÀ» "#!/bin/bash -r" ·Î ÇØ ÁÖ¸é
# Àüü ½ºÅ©¸³Æ®°¡ Á¦ÇÑµÈ ¸ðµå¿¡¼­ µ¿ÀÛÇÕ´Ï´Ù.

echo

echo "µð·ºÅ丮¸¦ ¹Ù²Ù°Ú½À´Ï´Ù."
cd /usr/local
echo "Áö±ÝÀº `pwd` ¿¡ ÀÖ½À´Ï´Ù."
echo "Áý(home)À¸·Î µ¹¾Æ°©´Ï´Ù."
cd
echo "Áö±ÝÀº `pwd` ¿¡ ÀÖ½À´Ï´Ù."
echo

# ¿©±â±îÁö´Â Ưº°ÇÑ °Ô ¾ø´Â Á¦ÇѵÇÁö ¾ÊÀº ¸ðµå¿´½À´Ï´Ù.

set -r
# set --restricted    µµ °°Àº È¿°ú¸¦ °¡Á®¿É´Ï´Ù.
echo "==> Áö±ÝºÎÅÍ´Â Á¦ÇÑµÈ ¸ðµå·Î µ¿ÀÛÇÕ´Ï´Ù. <=="

echo
echo

echo "Á¦ÇÑµÈ ¸ðµå¿¡¼­ µð·ºÅ丮¸¦ ¹Ù²Ù·Á°í ÇÕ´Ï´Ù."
cd ..
echo "¾ÆÁ÷µµ `pwd` ¿¡ ÀÖ±º¿ä."

echo
echo

echo "\$SHELL = $SHELL"
echo "Á¦ÇÑµÈ ¸ðµå¿¡¼­ ½©À» ¹Ù²Ù·Á°í ÇÕ´Ï´Ù."
SHELL="/bin/ash"
echo
echo "\$SHELL= $SHELL"

echo
echo

echo "Á¦ÇÑµÈ ¸ðµå¿¡¼­ Ãâ·ÂÀ» ÀçÁöÇâ ÇÏ·Á°í ÇÕ´Ï´Ù."
ls -l /usr/bin > bin.files
ls -l bin.files    # ÆÄÀÏÀÌ »ý¼ºµÆ´ÂÁö ¾î¶²Áö ÇÑ ¹ø º¾½Ã´Ù.

echo

exit 0