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Project 2 Shell programming
2 Steps
2.1 vi
Step 1：Login the Linux as user stu.
Step 2：Start vi and switch to insert mode, enter the following words:
This is an exercise!
We use vi to do the edit.
Left, down, up, right.
Step 3：Search pattern in this file. Write the command and the result.
Step 4：Substitute one string. Write the command and the result.
Step 5：Copy/cut and paste some lines in the file. Write the command and the result.
Step 6：Copy/cut and paste some words in the file. Write the command and the result.
Step 7：How to repeat the last command or undo the last command.
Step 8：Write the command of how to quit or write and quit.
2.2 Shell programming
Step 1：Use vi to input Codes List 2-1.
Step 2：Run the program. If it cannot be executed, try to analyze the reason and fix it.
Step 3：Record the result of this program.
Step 4：Read the code, complete the function file_run().
Step 5：Modify function uers(), so as to display online users without breaking lines.
3 Summary
4 Codes List
#2-1 menu
MYDATE=`date +%d/%m/%y`
THIS_HOST=`hostname -s`
USER=`whoami`
file_run()
{
echo "you must complete it"
}
uers()
{
echo "there are `who|wc -l` users online"
echo -e "who are\n`who|awk '{print $1}'`"
}
while :
do
tput clear
cat <<aaa
---------------------------------------------------------------------
User:$USERHost:$THIS_HOSTDate:$MYDATE
---------------------------------------------------------------------
1 : List subdirectory in current directory
2 : List files in current directory which can run
3 : See who is on the system
H : Help screen
Q : Exit Menu
--------------------------------------------------------------------
aaa
echo -e -n "\tYour Choice [1,2,3,H,Q] >"
read CHOICE
case $CHOICE in
1) ls -l|awk '/^d/ {print $8}'
;;
2) file_run
;;
3) uers
;;
H|h)
cat <<aaa
This is the help screen,nothing here yet to help you!
aaa
;;
Q|q) exit 0
;;
*) echo -e "\t\007 unkown user response"
;;
esac
echo -e -n "\n\n\tHit the return key to continue"
read DUMMY
done