Mass Assign Users to Groups

I have 2 text files, users.txt with a list of 1000 users and groups.txt with a list of 50 groups. I want to run a command that adds 30 users to each group (ex: users 1-30 to group 1, users 31-60 to group 2, etc.). What would be the most practical way of doing this?

I suppose I could create 50 new text files with a list of 30 users on each and run 50 bash scripts, but I feel there is a better way than this.

Edit: This is what I have so far:

for i in `cat users.txt` ; do useradd $i; echo Pass$i | passwd $i -- stdin; done
for i in `cat groups.txt ; do groupadd $i; done

edited Jan 23 at 15:40

asked Jan 23 at 14:46

greglorious_85

1

To do this programmatically you need a user/group mapping. ie. tom:office. Having 50 textfiles each representing one group with the groupname as filename and the contents one user per line could be one option.Give examples of users.txt, groups.txt and how the user/group relation is done between those files to get help.

– Michael D.
Jan 23 at 15:17

1

@MichaelD. It's just an excercise, so the relation is not super important. The users are something like Joe, Sally, Bob, and the groups are something like Arizona, Florida, Utah. I just need each group have 30 users, but I don't have much experience in scripting in Linux.

– greglorious_85
Jan 23 at 15:25

add a comment |

I suppose I could create 50 new text files with a list of 30 users on each and run 50 bash scripts, but I feel there is a better way than this.

Edit: This is what I have so far:

for i in `cat users.txt` ; do useradd $i; echo Pass$i | passwd $i -- stdin; done
for i in `cat groups.txt ; do groupadd $i; done

edited Jan 23 at 15:40

asked Jan 23 at 14:46

greglorious_85

1

To do this programmatically you need a user/group mapping. ie. tom:office. Having 50 textfiles each representing one group with the groupname as filename and the contents one user per line could be one option.Give examples of users.txt, groups.txt and how the user/group relation is done between those files to get help.

– Michael D.
Jan 23 at 15:17

1

@MichaelD. It's just an excercise, so the relation is not super important. The users are something like Joe, Sally, Bob, and the groups are something like Arizona, Florida, Utah. I just need each group have 30 users, but I don't have much experience in scripting in Linux.

– greglorious_85
Jan 23 at 15:25

add a comment |

I suppose I could create 50 new text files with a list of 30 users on each and run 50 bash scripts, but I feel there is a better way than this.

Edit: This is what I have so far:

for i in `cat users.txt` ; do useradd $i; echo Pass$i | passwd $i -- stdin; done
for i in `cat groups.txt ; do groupadd $i; done

edited Jan 23 at 15:40

asked Jan 23 at 14:46

greglorious_85

I suppose I could create 50 new text files with a list of 30 users on each and run 50 bash scripts, but I feel there is a better way than this.

Edit: This is what I have so far:

for i in `cat users.txt` ; do useradd $i; echo Pass$i | passwd $i -- stdin; done
for i in `cat groups.txt ; do groupadd $i; done

linux fedora scripting users group

edited Jan 23 at 15:40

asked Jan 23 at 14:46

greglorious_85

edited Jan 23 at 15:40

asked Jan 23 at 14:46

greglorious_85

edited Jan 23 at 15:40

asked Jan 23 at 14:46

greglorious_85

asked Jan 23 at 14:46

greglorious_85

asked Jan 23 at 14:46

greglorious_85

1

To do this programmatically you need a user/group mapping. ie. tom:office. Having 50 textfiles each representing one group with the groupname as filename and the contents one user per line could be one option.Give examples of users.txt, groups.txt and how the user/group relation is done between those files to get help.

– Michael D.
Jan 23 at 15:17

1

@MichaelD. It's just an excercise, so the relation is not super important. The users are something like Joe, Sally, Bob, and the groups are something like Arizona, Florida, Utah. I just need each group have 30 users, but I don't have much experience in scripting in Linux.

– greglorious_85
Jan 23 at 15:25

add a comment |

1

To do this programmatically you need a user/group mapping. ie. tom:office. Having 50 textfiles each representing one group with the groupname as filename and the contents one user per line could be one option.Give examples of users.txt, groups.txt and how the user/group relation is done between those files to get help.

– Michael D.
Jan 23 at 15:17

1

@MichaelD. It's just an excercise, so the relation is not super important. The users are something like Joe, Sally, Bob, and the groups are something like Arizona, Florida, Utah. I just need each group have 30 users, but I don't have much experience in scripting in Linux.

– greglorious_85
Jan 23 at 15:25

To do this programmatically you need a user/group mapping. ie. tom:office. Having 50 textfiles each representing one group with the groupname as filename and the contents one user per line could be one option.Give examples of users.txt, groups.txt and how the user/group relation is done between those files to get help.

– Michael D.
Jan 23 at 15:17

@MichaelD. It's just an excercise, so the relation is not super important. The users are something like Joe, Sally, Bob, and the groups are something like Arizona, Florida, Utah. I just need each group have 30 users, but I don't have much experience in scripting in Linux.

– greglorious_85
Jan 23 at 15:25

add a comment |

1 Answer
1

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Although it is just an exercise and you should do it by yourself, here is a solution:
You really should do that by yourself, or be dumb.

Using some loops and simple tests:

while read group
do 
 i=30
 while read user
 do 
 echo $user:$group
 let "i--" 
 if [ $i -eq 0 ]
 then 
 break
 fi
 done < /tmp/users.txt
 sed -i -e '1,30d' /tmp/users.txt
done < groups.txt > userswithgroup.txt

Note that this will empty your users.txt file. so better make a copy.

Then you still have to add the users; but that's not complicated at this point.

answered Jan 23 at 15:59

jayooin

3347

add a comment |

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1 Answer
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1 Answer
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active

oldest

votes

Although it is just an exercise and you should do it by yourself, here is a solution:
You really should do that by yourself, or be dumb.

Using some loops and simple tests:

while read group
do 
 i=30
 while read user
 do 
 echo $user:$group
 let "i--" 
 if [ $i -eq 0 ]
 then 
 break
 fi
 done < /tmp/users.txt
 sed -i -e '1,30d' /tmp/users.txt
done < groups.txt > userswithgroup.txt

Note that this will empty your users.txt file. so better make a copy.

Then you still have to add the users; but that's not complicated at this point.

answered Jan 23 at 15:59

jayooin

3347

add a comment |

Although it is just an exercise and you should do it by yourself, here is a solution:
You really should do that by yourself, or be dumb.

Using some loops and simple tests:

while read group
do 
 i=30
 while read user
 do 
 echo $user:$group
 let "i--" 
 if [ $i -eq 0 ]
 then 
 break
 fi
 done < /tmp/users.txt
 sed -i -e '1,30d' /tmp/users.txt
done < groups.txt > userswithgroup.txt

Note that this will empty your users.txt file. so better make a copy.

Then you still have to add the users; but that's not complicated at this point.

answered Jan 23 at 15:59

jayooin

3347

add a comment |

Although it is just an exercise and you should do it by yourself, here is a solution:
You really should do that by yourself, or be dumb.

Using some loops and simple tests:

while read group
do 
 i=30
 while read user
 do 
 echo $user:$group
 let "i--" 
 if [ $i -eq 0 ]
 then 
 break
 fi
 done < /tmp/users.txt
 sed -i -e '1,30d' /tmp/users.txt
done < groups.txt > userswithgroup.txt

Note that this will empty your users.txt file. so better make a copy.

Then you still have to add the users; but that's not complicated at this point.

answered Jan 23 at 15:59

jayooin

3347

Although it is just an exercise and you should do it by yourself, here is a solution:
You really should do that by yourself, or be dumb.

Using some loops and simple tests:

while read group
do 
 i=30
 while read user
 do 
 echo $user:$group
 let "i--" 
 if [ $i -eq 0 ]
 then 
 break
 fi
 done < /tmp/users.txt
 sed -i -e '1,30d' /tmp/users.txt
done < groups.txt > userswithgroup.txt

Note that this will empty your users.txt file. so better make a copy.

Then you still have to add the users; but that's not complicated at this point.

answered Jan 23 at 15:59

jayooin

3347

answered Jan 23 at 15:59

jayooin

3347

answered Jan 23 at 15:59

jayooin

3347

answered Jan 23 at 15:59

jayooin

3347

add a comment |

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