1. Variable
A=8
echo $A
2. Passing parameters
echo “$0 $1 $2”
echo “$*”
echo “[email protected]”
echo “$#”
3. Operator
S=$[(2+3)*4]
4. Judgment
= String Compare
-lt less thanless than
-le less thanequal
-eq equals equal
-gt greater than great than
-ge greater than< span style="font-family: 宋体;">equalgreant than equal
-ne notequalnot equal
if [conditional judgment formula];then < /span>
Program
fi
5. Loop
for j in “[email protected]”
do
echo “The num is $j”
Done
for (( initial value;loop control conditions; variable changes))
do
Program
done
while [conditional judgment]
do
Program
done