Script receive options for shell scripts

1. Create a script that can add script information to other scripts:
#vim cs.sh
#!/bin/bash
Cat > $ <<eof
#!/bin/bash
#Name: ' BaseName $ '
#Description:
#Author: TEST
#Version: 0.0.1
#Datatime: ' Date ' +%f +%t "'
#Usage: ' BaseName $ '

Eof
Vim +8 $

2. Modify the script, if there is content in the open script, open it directly, if it is empty, add the information.
#vim cs.sh
#!/bin/bash
if! grep "[^[::space]]" $ &>/dev/null; Then
Cat > $ <<eof
#!/bin/bash
#Name: ' BaseName $ '
#Description:
#Author: TEST
#Version: 0.0.1
#Datatime: ' Date ' +%f +%t "'
#Usage: ' BaseName $ '

Eof
Vim +8 $
Fi
Vim + $

3. Modify the script and add the grammar test function. If there is an error, let the user choose whether to quit editing.
#vim cs.sh
#!/bin/bash
if! grep "[^[::space]]" $ &>/dev/null; Then
Cat > $ <<eof
#!/bin/bash
#Name: ' BaseName $ '
#Description:
#Author: TEST
#Version: 0.0.1
#Datatime: ' Date ' +%f +%t "'
#Usage: ' BaseName $ '

Eof
Vim +8 $
Fi
Vim + $

Until Banshi-n $ &>/dev/null;d o
Read-p "Syntax error, q| Q for Quit,others for edit. " Opt
Case $ in {
q| Q)
echo "Quit"
Exit 5
;;
*)
Vim + $
;;
}
Esac
Done

chmod +x $

4. Use the cs.sh to create a script and add options to the script. ：
#./cs.sh opt.sh
#!/bin/bash
#Name: opt.sh
#Description:
#Author: TEST
#Version: 0.0.1
#Datatime: xxxx-xxxx
#Usage: opt.sh
function USAGE () {
echo "Usage:opt.sh [-b|-d] args"

}
While getopts ": b:d:" SW;d O
Case $SW in
b
echo "The option is B"
Echo $OPTARG
;;
D
echo "The option is D"
Echo $OPTARG
;;
\?)
echo "Wrong Options"
USAGE
;;
Esac
Done
#./opt.sh-b test1
#./opt.sh-d test2
#./opt.sh-c test3

5. Modify the sc.sh and use the option to let the user enter description when creating the script.
#vim cs.sh
#!/bin/bash
While getopts ":d:" Sw;do
Case $SW in
D
Desc= $OPTARG
\?)
echo "Usage:sc.sh [-D DESCRIPTION] FILENAME"
Esca
Done

Shift $[$OPTIND-1]

if! grep "[^[::space]]" $ &>/dev/null; Then
Cat > $ <<eof
#!/bin/bash
#Name: ' BaseName $ '
#Description: $DESC
#Author: TEST
#Version: 0.0.1
#Datatime: ' Date ' +%f +%t "'
#Usage: ' BaseName $ '

Eof
Vim +8 $
Fi
Vim + $

Until Banshi-n $ &>/dev/null;d o
Read-p "Syntax error, q| Q for Quit,others for edit. " Opt
Case $ in {
q| Q)
echo "Quit"
Exit 5
;;
*)
Vim + $
;;
}
Esac
Done

chmod +x $

6. Edit the opt.sh to see the specifics of the optind.
#vim opt.sh
#!/bin/bash
#Name: opt.sh
#Description:
#Author: TEST
#Version: 0.0.1
#Datatime: xxxx-xxxx
#Usage: opt.sh
function USAGE () {
echo "Usage:opt.sh [-b|-d] args"

}
While getopts ": BD" SW;d O
Case $SW in
b
echo "The option is B"
Echo $OPTARG
Echo $OPTIND
;;
D
echo "The option is D"
Echo $OPTARG
Echo $OPTIND
;;
\?)
echo "Wrong Options"
USAGE
;;
Esac
Done
#./opt.sh-b
2
#./opt.sh-b-D
2
3
7. Write a script ift.sh, you can accept the option I I a, the requirements are as follows:
Usage is as follows: ift.sh [-I interface|-i ip|-a]
-I displays the IP address of the specified network card,-I displays the interface corresponding to the IP address,-a displays all interfaces and IP information outside the IO interface.

#vim ift.sh
#!/bin/bash
Showip () {
if! Ifconfig|grep-o "^[^[:space:]]\{1,\}" |grep &>/dev/null; Then
Return 15
Fi

Echo-n "${1}:"
Ifconfig $ |grep-o "inet addr:[0-9\." \{1,\} "|cut-d:-f2
Echo
}

Showif () {
if! Ifconfig |grep-o "inet addr:[0-9\. \{1,\} "|cut-d:-f2|grep $ &>/dev/null;then
return 16
Fi

Echo-n "${1}:"
Ifconfig |grep-b 1 "$" |grep-o "^[^[:space:]]\{1,\}"
Echo
}

ShowAll () {
Don't want to come out for the time being empty first!! Later


}

While getopts ": i:i:a:" SW;d O
Case $SW in
I
Showip $OPTARG
If [$?-eq] && echo "Wrong interface!"
;;
I)
showif $OPTARG
f [$-eq] && echo "Wrong ip!"
;;
A
ShowAll
;;

\?)
echo "Usage ift.sh [-I interface|-i ip| -A] "
;;
Esac






#getopts "[:]option[:] ..." [Optarg]
Built-In Parameters:
Optarg parameters
Optind the option index, when there are multiple options in the script, the first point is to the second option, note that it is not a. Use shift to point to the third option, and so on.

The option option can have multiple if the parameter has the OPTARG option built-in parameters behind it, and if the post parameter is followed, the option is preceded by a colon (:).
If you do not want to output an error message, precede all options with a colon (:).
Note that only one option can be followed at a time and cannot be followed by more than one.

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Script receive options for shell scripts