Linux commands: Bash scripting-Script

Exercise: Write a script adminuser33.shthat uses the following format:

Adminuser33.sh--add-del-h|--help-v|--verbose

among them, - H option can only be used alone to display help information; --add option, a new user is added; - v option, the new user appears after the new user is displayed, and the--del option deletes the user.

#!/bin/bash
#
Debug=0
Add=0
Del=0

For I in ' seq 1 $# '; Do

If [$#-gt 0]; Then

    Case in                   have a match to end the entire case
   -v|--verbose)
      debug=1
      shift    ;;
   -H|--HELP)
      echo "Usage: ' basename $--add user_list--del user_list-v|--verbose-h|--help"
  &nbs P   exit 0
     ;;
   --add)
      add=1
      addusers=$2
      shift 2
     ;
   --del)
      del=1
      delusers=$2
      Shift 2
      ;;

*)
echo "Usage: ' basename $--add user_list--del user_list-v|--verbose-h|--help"
Exit 7
Esac

Fi

Done

If [$ADD-eq 1]; Then
For Auser in `echo $ADDUSERS | Sed ' s@,@ @G`; Do
ifID $AUSER &>/dev/null; Then
[$DEBUG-eq 1]&& echo "$AUSER exists."
Else
Useradd $AUSER
[$DEBUG-eq 1] && echo "ADD user $AUSER finished."
fi
Done
Fi

If [$DEL-eq 1]; Then
For Duser in ' echo $DELUSERS | Sed ' [email protected],@ @g '; Do
If ID $DUSER &>/dev/null; Then
Userdel-r $DUSER
[$DEBUG-eq 1] && echo "Delete $DUSER finished."
Else
[$DEBUG-eq 1] && echo "$DUSER not exists."
Fi
Done
Fi
echo "$DEBUG add: $ADD del: $DEL"

[Email protected] ~]#/adminuser33.sh-v--add tom2,tom3--del tom2
ADD user Tom2 finished.
ADD user Tom3 finished.
Delete Tom2 finished.
1 add:1 del:1

Exercise: Write a script showlogged.sh , which is in the following format:

Showlogged.sh-v-c-h|--help

among them, - H option can only be used alone to display help information; - C option, displays the number of all users logged on on the current system; - v option displays both the number of users logged in simultaneously and information about the logged-on user, such as

1 #!/bin/bash
2 #
3
4
5 Declare shownum=0
6 Declare showusers=0
7 for I in 'seq 1 $#` ; Do
8 If [$#-GT 0]; Then
9 Case $ in
10-C)
Shownum=1
12Shift
13;;
14-v|--verbose)
Showusers=1
Shownum=1
Shift
18;;
19-H|--HELP)
echo "Showlogged.sh-v-c-h|--help."
Exit 0
22;;
23 *)
echo "Showlogged.sh-v-c-h|--help."
Exit 7
26;;
Esac
-Fi
Done
If [$SHOWNUM-eq 1]; Then
echo "logged Usrs: ' Who | Wc-l ' "
Who
If [$SHOWUSERS-eq 1]; Then
echo "All users: ' cat/etc/passwd | cut-d:-f1 |wc-l ' "
+ fi
+ fi

[Email protected] ~]#./showloged.sh-v
Logged Usrs:3
Root pts/0 2016-10-24 07:55 (*.*.135.13)
Root PTS/1 2016-10-24 13:34 (*.*.135.13)
Root PTS/2 2016-10-24 15:30 (*.*.135.13)
All users:62
[Email protected] ~]#./showloged.sh-c
Logged Usrs:3
Root pts/0 2016-10-24 07:55 (*.*.135.13)
Root PTS/1 2016-10-24 13:34 (*.*.135.13)
Root PTS/2 2016-10-24 15:30 (*.*.135.13)

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Linux commands: Bash scripting-Script