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 if list then
          do something here
      elif list then
          do another thing here
      else
         do something else here
      fi   
EX1:
#!/bin/sh
SYSTEM=`uname -s`    #»ñÈ¡²Ù×÷ϵͳÀàÐÍ£¬ÎÒ±¾µØÊÇlinux
if [ $SYSTEM = "Linux" ] ; then     #Èç¹ûÊÇlinuxµÄ»°´òÓ¡linux×Ö·û´®
echo "Linux"
elif [ $SYSTEM = "FreeBSD" ] ; then   
echo "FreeBSD"
elif [ $SYSTEM = "Solaris" ] ; then
echo "Solaris"
else
echo "What?"
fi     #ifend
»ù±¾ÉÏºÍÆäËû½Å±¾ÓïÑÔÒ»Ñù¡£Ã»ÓÐÌ«´óÇø±ð¡£²»¹ýÖµµÃ×¢ÒâµÄÊÇ¡£[]ÀïÃæµÄÌõ¼þÅжϡ£
1 ×Ö·û´®ÅжÏ
str1 = str2¡¡¡¡¡¡¡¡¡¡¡¡µ±Á½¸ö´®ÓÐÏàͬÄÚÈÝ¡¢³¤¶ÈÊ±ÎªÕæ
str1 != str2¡¡¡¡¡¡¡¡¡¡ µ±´®str1ºÍstr2²»µÈÊ±ÎªÕæ
-n str1¡¡¡¡¡¡¡¡¡¡¡¡¡¡ µ±´®µÄ³¤¶È´óÓÚ0Ê±ÎªÕæ(´®·Ç¿Õ)
-z str1¡¡¡¡¡¡¡¡¡¡¡¡¡¡ µ±´®µÄ³¤¶ÈΪ0Ê±ÎªÕæ(¿Õ´®)
str1¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡   µ±´®str1Ϊ·Ç¿ÕÊ±ÎªÕæ
2 Êý×ÖµÄÅжÏ
int1 -eq int2¡¡¡¡¡¡¡¡Á½ÊýÏàµÈÎªÕæ
int1 -ne int2¡¡¡¡¡¡¡¡Á½Êý²»µÈÎªÕæ
int1 -gt int2¡¡¡¡¡¡¡¡int1´óÓÚint2ÎªÕæ
int1 -ge int2¡¡¡¡¡¡¡¡int1´óÓÚµÈÓÚint2ÎªÕæ
int1 -lt int2¡¡¡¡¡¡¡¡int1СÓÚint2ÎªÕæ
int1 -le int2¡¡¡¡¡¡¡¡int1СÓÚµÈÓÚint2ÎªÕæ
3 ÎļþµÄÅжÏ
-r file¡¡¡¡¡¡¡¡¡¡Óû§¿É¶ÁÎªÕæ
-w file¡¡¡¡¡¡¡¡¡¡Óû§¿ÉÐ´ÎªÕæ
-x file¡¡¡¡¡¡¡¡¡¡Óû§¿ÉÖ´ÐÐÎªÕæ
-f file¡¡¡¡¡¡¡¡¡¡ÎļþΪÕý¹æÎļþÎªÕæ
-d file¡¡¡¡¡¡¡¡¡¡ÎļþÎªÄ¿Â¼ÎªÕæ
-c file¡¡¡¡¡¡¡¡¡¡ÎļþΪ×Ö·ûÌØÊâÎļþÎªÕæ
-b file¡¡¡¡¡¡¡¡¡¡ÎļþΪ¿éÌØÊâÎļþÎªÕæ
-s file¡¡¡¡¡¡¡¡¡¡Îļþ´óС·Ç0Ê±ÎªÕæ
-t file¡¡¡¡¡¡¡¡¡¡µ±ÎļþÃèÊö·û(ĬÈÏΪ1)Ö¸¶¨µÄÉ豸ΪÖÕ¶ËÊ±ÎªÕæ
3 ¸´ÔÓÂß¼­ÅжÏ
-a ¡¡ ¡¡¡¡¡¡¡¡¡¡ Óë
-o¡¡¡¡¡¡¡¡¡¡¡¡¡¡ »ò
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