shell script

最近學習linux的shell script 
做一寫筆記備用


$1 $2 .....     parameter 1 2 ....
$# total number of parameter
$? return value of previous command
$@ list of all parameters one bye one
$* list all parameters with one string


logic operator
1. 
while [ true ] ; do
done
2. 
until [ ] ; do
done
3. 
for arg in " "
do
done
4. 
if [ ]
then
else
fi

Online Tutorial Link