Linux-shell First Lesson

Linux-shell First Lesson

1, through a small example to introduce the shell

#！ /bin/sh Call Sehll

echo Print content read input cd jump directory pwd View current directory

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2, define two variables, and find a fit.

A=5
B=6
c=$ (($a + $b))
Echo $c

3, define the variable, and the value of the variable plus 5.

D=9
Let "d+=5"
Echo $d

4. Calling functions

Func1 ()
{
num=105;
Echo $num
}
Func2 ()
{
Local num=13//setting locals
Echo $num
}
Func1
Func2

5. Define function and delete function

Hello ()
{
echo "hello,world!"
}
Hello
Unset-f Hello//delete function

Hello

6. Transmission parameters

#!/bin/sh
Tesfunc ()
{
echo "$# total delivery of $ #个值"
echo "value is: [Email protected]"
}
Tesfunc a b c d E F

#!/bin/sh
Tesfunc ()
{
echo "$# total delivery of $ #个值"
echo "value is: [Email protected]"
echo "The third parameter is $ three"
echo "$?" The last command exits the status as 0 normal "
}
Tesfunc a b c d E F

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Linux-shell First Lesson