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Searching the pattern and accordingly changing the contents using shell

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# 1  
Old 10-05-2013
Searching the pattern and accordingly changing the contents using shell
HI,

I have File1 which contains :-
Code:
admins = anand,satheesha,user1,user2,user3,user4,user5,user10,vishal
nonadmins = read-only
@admins = rw
@nonadmins = r

One shell script, using that I want to change the File1 as per user input (let's say $1) which have value as 'John', so now I want to change File1 so that only admins line should be updated with John, so Now after shell script executed File1 should be like this :-

Code:
admins = anand,satheesha,user1,user2,user3,user4,user5,user10,vishal,John
nonadmins = read-only
@admins = rw
@nonadmins = r

Same way if user want to delete the same file let's say $2=user3, so same file should become like this :-

Code:
admins = anand,satheesha,user1,user2,user4,user5,user10,vishal,John
nonadmins = read-only
@admins = rw
@nonadmins = r

Please help me to do that, BIG THANKS in advance.
Last edited by Don Cragun; 10-05-2013 at 02:00 PM.. Reason: Add CODE tags
# 2  
Old 10-05-2013
Is this a homework assignment?

Do you always want to add one user to the admins list and remove one user from the admins lists every time you call your script? Wouldn't it be better to use an option to indicate whether an invocation of your script was supposed to add or remove an arbitrary number of users (presented as operands) to or from the admins list?
# 3  
Old 10-05-2013
Searching the pattern and accordingly changing the contents using shell
Actually I have one sheel script where I am asking user to enter option 1) for adding 2) deleting, so now on the basis of provided input I have to update file accordingly.

---------- Post updated at 11:28 PM ---------- Previous update was at 11:24 PM ----------

Code:
[root@lab vishal]# echo $tmp
admins = anand,ameo,satheesha,user1,user2,user3,user4,user5,user6,user7,user8,user9,user10,vishal
[root@lab vishal]# echo $tmp1
admins = anand,ameo,satheesha,user1,user2,user3,user4,user5,user6,user7,user8,user9,user10,vishal,rohit

But when I try to replace $tmp with $tmp1 in file1, still it didn't replaced and ",rohit" not added.

Code:
[root@lab vishal]# sed 's/$tmp/$tmp1/g' file1
[groups]
admins = broadhop,anand,ameo,satheesha,user1,user2,user3,user4,user5,user6,user7,user8,user9,user10,vishal
nonadmins = read-only
[/]
@admins = rw
@nonadmins = r

Last edited by Don Cragun; 10-05-2013 at 03:48 PM.. Reason: Add CODE tags, again
# 4  
Old 10-05-2013
Please use code tags as required by forum rules!

Don't use single quotes but double quotes if you want the shell variables to be expanded.
# 5  
Old 10-05-2013
Try

Code:
$ cat test.txt 
admins = anand,satheesha,user1,user2,user3,user4,user5,user10,vishal
nonadmins = read-only
@admins = rw
@nonadmins = r

Code:
#!/bin/bash

check(){
    if [ -z "$1" ];then echo "No user input exiting..";exit;fi
       }

printf "\nOption Availble :\n\t\t  1. Add User\n\t\t  2. Delete User\n\
Usage :\n\t   Add User----> 1 username filename\n\tDelete User----> 2 username filename\n\n\n\tAnswer  : \t"

read inp usr fil
check $inp;check $usr;check $fil

ex=$(grep "$usr" $fil)
if [ $inp -eq "1" ] || [[ $inp -eq "2"  &&  ! -z "$ex" ]];then 

    awk -F, -v arg=$inp -v usr=$usr '

    function remove(us,line){
                                u1=","us; u2=us","
                                error="User Not Found"
                                return ( ((gsub(u1,x,line)) || (gsub(u2,x,line)))==1 )?line:error    
                            }
                            {         
                                print (arg==1)?(/^admins/)?$0","usr:$0:\
                                      (arg==2)?(/^admins/)?remove(usr,$0):$0:"Error"
                            }' $fil

else 
    echo "It seems username not exist in file"    
    exit;
fi

To add user
Code:
$ bash user.sh

Option Availble :
          1. Add User
          2. Delete User
Usage :
       Add User----> 1 username filename
    Delete User----> 2 username filename


    Answer  :     1 dummy_user123 test.txt
admins = anand,satheesha,user1,user2,user3,user4,user5,user10,vishal,dummy_user123
nonadmins = read-only
@admins = rw
@nonadmins = r

To delete user
Code:
$ bash user.sh

Option Availble :
          1. Add User
          2. Delete User
Usage :
       Add User----> 1 username filename
    Delete User----> 2 username filename


    Answer  :     2 user3 test.txt
admins = anand,satheesha,user1,user2,user4,user5,user10,vishal
nonadmins = read-only
@admins = rw
@nonadmins = r

Error if username not found
Code:
$ bash user.sh

Option Availble :
          1. Add User
          2. Delete User
Usage :
       Add User----> 1 username filename
    Delete User----> 2 username filename


    Answer  :     2 akshay test.txt
It seems username not exist in file

Last edited by Akshay Hegde; 10-06-2013 at 05:32 AM..
# 6  
Old 10-06-2013
Hi Akshay,
BIG BIG Thanks, It's working.

I will say thanks from the heart for the expert like you.

-Vishal
# 7  
Old 10-06-2013
Welcome to Forum !
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