linux ifÃüÁî
linux ifÃüÁî
ÎÞÂÛʲô±à³ÌÓïÑÔ¶¼Àë²»¿ªÌõ¼þÅжϡ£SHELLÒ²²»ÀýÍâ¡£
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
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1 ×Ö·û´®ÅжÏ
str1 = str2¡¡¡¡¡¡¡¡¡¡¡¡µ±Á½¸ö´®ÓÐÏàͬÄÚÈÝ¡¢³¤¶ÈʱΪÕæ
str1 != str2¡¡¡¡¡¡¡¡¡¡ µ±´®str1ºÍstr2²»µÈʱΪÕæ
-n str1¡¡¡¡¡¡¡¡¡¡¡¡¡¡ µ±´®µÄ³¤¶È´óÓÚ0ʱΪÕæ(´®·Ç¿Õ)
-z str1¡¡¡¡¡¡¡¡¡¡¡¡¡¡ µ±´®µÄ³¤¶ÈΪ0ʱΪÕæ(¿Õ´®)
str1¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡ µ±´®str1Ϊ·Ç¿ÕʱΪÕæ
2 Êý×ÖµÄÅжÏ
int1 -eq int2¡¡¡¡¡¡¡¡Á½ÊýÏàµÈΪÕæ
int1 -ne int2¡¡¡¡¡¡¡¡Á½Êý²»µÈΪÕæ
int1 -gt int2¡¡¡¡¡¡¡¡int1´óÓÚint2ΪÕæ
int1 -ge int2¡¡¡¡¡¡¡¡int1´óÓÚµÈÓÚint2ΪÕæ
int1 -lt int2¡¡¡¡¡¡¡¡int1СÓÚint2ΪÕæ
int1 -le int2¡¡¡¡¡¡¡¡int1СÓÚµÈÓÚint2ΪÕæ
3 ÎļþµÄÅжÏ
-r file¡¡¡¡¡¡¡¡¡¡Óû§¿É¶ÁΪÕæ
-w file¡¡¡¡¡¡¡¡¡¡Óû§¿ÉдΪÕæ
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-b file¡¡¡¡¡¡¡¡¡¡ÎļþΪ¿éÌØÊâÎļþΪÕæ
-s file¡¡¡¡¡¡¡¡¡¡Îļþ´óС·Ç0ʱΪÕæ
-t file¡¡¡¡¡¡¡¡¡¡µ±ÎļþÃèÊö·û(ĬÈÏΪ1)Ö¸¶¨µÄÉ豸ΪÖÕ¶ËʱΪÕæ
3 ¸´ÔÓÂß¼ÅжÏ
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