PoojaMoolya: Created page with "{| border=1 |- || '''Time''' || '''Narration''' |- || 00:01 || Hello and welcome to the spoken tutorial on '''Modifying User Account in Linux.''' |- || 00:08 || In this tuto..."

2022-09-07T08:53:59Z

Created page with "{| border=1 |- || '''Time''' || '''Narration''' |- || 00:01 || Hello and welcome to the spoken tutorial on '''Modifying User Account in Linux.''' |- || 00:08 || In this tuto..."

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|| '''Time'''
|| '''Narration'''

|-
|| 00:01
|| Hello and welcome to the spoken tutorial on '''Modifying User Account in Linux.'''

|-
|| 00:08
|| In this tutorial we will learn about '''usermod command'''

|-
|| 00:13
|| Modifying''' attributes''' of '''user account'''

|-
|| 00:17
|| Locking and unlocking '''password''' or '''account'''

|-
|| 00:21
||We will do this through some examples.
|-
|| 00:25
|| To record this tutorial, I am using '''Ubuntu Linux 16.04 Operating System'''
|-
|| 00:33
|| To practice this tutorial, you should have gone through the '''Linux System Administration '''tutorials''' '''on this website and

|-
|| 00:42
|| You must have '''root access''' to your computer.

|-
|| 00:47
|| The '''command usermod''' is used to modify the '''attributes''' of an already created '''user account'''.

|-
|| 00:55
||This is the syntax.

|-
|| 00:58
||Here the '''options''' part is not mandatory.

|-
|| 01:03
||This '''command''' supports many '''options'''.

|-
|| 01:06
||We will learn them through some examples.
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|| 01:10
|| Earlier in the series, we had created a '''user radha.'''

|-
|| 01:15
||Now let’s modify the''' user account attributes''' of '''radha''' by using the '''usermod command.'''
|-
|| 01:23
|| Open the '''terminal '''by pressing '''Ctrl, Alt and T '''keys simultaneously on the keyboard.
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|| 01:32
|| First, we will login as '''superuser '''or '''root user'''.

|-
|| 01:37
||To do so, type '''sudo space su '''and press '''Enter.'''
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|| 01:44
|| Type your''' password '''and then press '''Enter'''.
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|| 01:48
|| Notice, our '''login prompt '''has now changed to a '''hash''' symbol.

|-
|| 01:54
||This indicates that we are in the''' root user mode'''.
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|| 01:59
|| Here onwards, please remember to press the '''Enter''' key after typing each '''command'''.
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|| 02:05
|| We will check the '''user id''' and group information for '''user radha'''.

|-
|| 02:11
||On the '''terminal '''type '''id space radha'''
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|| 02:17
|| Notice, '''user ID''' of '''radha''' is '''1002'''
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|| 02:23
|| In order to modify '''user ID''' to '''1100''',

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|| 02:28
||On the '''terminal''' we have to type- '''usermod space hyphen u in small letter space 1100 space radha'''

|-
|| 02:40
|| Now once again, type '''id space radha.'''

|-
|| 02:45
||Notice that the '''UID''' has been changed to '''1100.'''
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|| 02:51
|| '''usermod command''' can be used to modify a '''user'''’s '''primary''' and '''supplementary group.'''
|-
|| 02:58
|| '''User radha '''belongs to '''primary group CSE'''

And '''supplementary groups music_club''' and '''sports_club.'''

|-
|| 03:08
| We will change the''' primary group''' from '''CSE''' to '''electronics'''.

|-
|| 03:14
||We will also change the '''supplementary group''' to '''literature_club'''.

|-
|| 03:20
|| But we have not created the '''groups electronics''' or''' literature_club'''.

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|| 03:27
|| So, first we have to create these two '''groups'''.

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|| 03:31
|| Switch to the '''terminal'''.

Type '''addgroup space electronics'''
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|| 03:39
|| '''Group electronics''' is added with''' GID 1006'''.
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|| 03:45
|| Next, type '''addgroup space literature_club'''.
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|| 03:51
|| '''Group literature_club''' is added with '''GID 1007.'''
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|| 03:58
|| Now, to modify the''' primary''' and''' supplementary groups''', type:

'''usermod space -g space electronics space -G in caps space literature_club space radha'''
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|| 04:18
|| '''hyphen capital G''' option removes the '''user''' from previous '''supplementary groups'''

|-
|| 04:25
||In this case, it removes from the previous '''supplementary groups'''.
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|| 04:29
|| And adds the '''user''' to the new '''group''' '''literature_club'''
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|| 04:35
|| Type '''id space radha'''
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|| 04:39
|| Now we can see that the '''primary group''' is set to '''electronics.'''

And '''supplementary group''' is set to '''literature_club.'''
|-
|| 04:49
|| How can you add a '''user''' to a new '''supplementary group''' while retaining the previous '''groups'''?

|-
|| 04:56
|| For this, you should use '''-a option.'''

|-
|| 05:01
|| '''a option''' denotes '''append'''.

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|| 05:05
|| Say for example, '''user radha''' wishes to be in both '''music_club''' and '''literature_club groups'''.

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|| 05:15
||For this type: '''usermod space hyphen a space hyphen G in caps space music_club space radha'''
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|| 05:29
|| Once again, type '''id space radha'''
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|| 05:34
|| Notice that '''user radha''' now belongs to two '''supplementary groups''' -

'''music_club''' and '''literature_club'''
|-
|| 05:44
|| Suppose we now want to change the '''login name''' itself from '''radha''' to '''testmod'''.

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|| 05:52
||To do this, on the '''terminal '''type the following: '''usermod space hyphen l space testmod space radha'''
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|| 06:04
|| Now '''user radha''' has become '''user testmod'''.
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|| 06:09
|| Let’s search for '''testmod'''’s details in''' /etc/passwd''' file.

|-
|| 06:17
||Type '''grep space testmod space /etc/passwd'''
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|| 06:26
|| Notice that the '''login name''' or '''user name''' has changed but the '''home directory''' remains the same.

|-
|| 06:34
||Ideally, we should rename the '''home directory''' to match the '''login name'''.
|-
|| 06:40
|| There are 2 methods to do this.
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|| 06:43
|| Method 1:

We can manually rename the '''home directory''' to match the '''login name'''.

|-
|| 06:50
||Let me do that now.
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|| 06:52
|| Type '''mv space slash home slash radha space slash home slash testmod'''

|-
|| 07:02
||This '''command''' will rename '''directory radha''' to '''testmod'''.
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||07:09
|| Now, use any '''text editor''' to update the entry in ''' slash etc slash passwd''' file.

|-
|| 07:18
||I will be using '''gedit text editor'''.

|-
|| 07:22
||Type '''gedit space slash etc slash passwd space ampersand'''

|-
|| 07:32
|| Now search for''' slash home slash radha'''

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|| 07:37
||Replace it with '''slash home slash testmod'''
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|| 07:42
|| Save and close the file.
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|| 07:45
|| Press '''Ctrl C''' to stop the currently running process.
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|| 07:51
|| Now press the '''Up''' arrow key to get the '''grep command''' for '''user testmod'''.

And press '''Enter.'''
|-
|| 08:00
|| Notice that we have '''testmod''' as the new '''home directory '''for the '''user testmod'''.
|-
|| 08:08
|| Method 2: We can change the''' home directory''' for the '''user radha '''with the help of '''usermod command'''.
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|| 08:17
|| The syntax to change the '''home directory''' of '''user radha''' to the '''directory '''named '''testmod''' is as follows:

'''usermod space -m space -d space slash home slash testmod space radha'''
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|| 08:37
|| This '''command''' will change the '''home directory''' of '''user radha '''to '''testmod'''
|-
|| 08:44
|| '''-d''' is used to modify the '''directory''' for any existing '''user account'''

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|| 08:51
|| '''-m''' moves the contents of the existing '''home directory''' to the new '''home directory'''.

|-
|| 08:59
||The new '''directory''' will be created, if it does not already exist.
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|| 09:05
|| Important note: We should write''' hyphen d option''' immediately after the new '''directory''' name.

Else we will get an error.
|-
|| 09:17
|| I will not demonstrate this because we have already changed the '''home directory''' using method 1.
|-
|| 09:25
|| Now let’s learn how to modify the '''user’s login shell '''and''' comments field'''.
|-
||09:32
|| Notice that our current '''login shell''' is '''/bin/bash''' and we have “'''Radha”''' as '''comments.'''
|-
|| 09:41
|| On the '''terminal '''type

'''usermod space hyphen s space slash bin slash sh space hyphen c space within double quotes This is modified user space testmod'''
|-
|| 10:00
|| Press the '''Up''' arrow key to get previous '''grep command.'''
|-
|| 10:05
|| Notice, we have changed the values in '''shell''' and '''comments field.'''
|-
|| 10:11
|| As a '''system admin''' you may need to lock a '''user account''' for various reasons, like violation of some rules by the user.

|-
|| 10:21
||To lock the''' user testmod''', type: '''usermod space hyphen L in Caps space testmod'''
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|| 10:31
|| Now type '''cat space slash etc slash shadow'''
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|| 10:38
|| On doing so, we get an exclamation mark added before the '''encrypted password''' for '''user testmod'''.

|-
|| 10:46
||So, no '''password''' will match it anymore.

|-
|| 10:50
||We have also seen this while locking '''password''' with '''passwd command.'''
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||10:56
|| It will lock only the access to '''password'''.

|-
|| 11:00
|| If you wish to lock the '''account''' itself, you should also set the '''expiry date''' to 1.

|-
|| 11:07
|| For that type '''usermod space hyphen capital L space hyphen e space 1 space username'''

|-
|| 11:19
||It will prevent the '''user''' from '''logging in''' from any other source including '''ssh'''.

|-
|| 11:26
||I will skip the demonstration of this '''command'''.
|-
|| 11:30
|| To unlock the '''account''' we have to type: '''usermod space hyphen U in caps space testmod'''
|-
|| 11:41
|| Once again check the contents of '''/etc/shadow''' file.

|-
|| 11:47
||Notice, the '''exclamation mark''' is removed now.

|-
|| 11:51
||It means the '''password''' is not locked.
|-
|| 11:55
|| We have seen all the options supported by '''usermod command.'''

|-
|| 12:00
||You can use the '''man command''' anytime to get details of '''usermod command'''.
|-
|| 12:06
|| Type '''man space usermod'''
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|| 12:10
|| Notice, all the details about this '''command''' as shown.

|-
|| 12:16
||Type '''q '''to '''quit '''from this '''command'''.
|-
|| 12:20
|| To exit from the''' root user access''', type '''exit'''

And press '''Enter.'''
|-
|| 12:27
|| This brings us to the end of this tutorial.

Let us summarize.
|-
|| 12:33
|| In this tutorial we learnt about-

'''usermod command''', Modifying''' attributes '''of''' user account''', Locking and unlocking''' password '''or''' account'''

|-
|| 12:47
|| As assignment, modify '''user account amit''' such that

'''Primary group''' is '''electronics'''

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|| 12:56
|| '''Supplementary groups''' are '''music_club''' and '''literature_club'''

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|| 13:03
|| Set '''home directory''' as '''amit_newDir'''

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|| 13:09
||Include '''comment "Stream Change Student"'''

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|| 13:13
|| Perform all the mentioned tasks in a single '''command'''.

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|| 13:18
|| Check the entry of '''user account amit''' in '''/etc/passwd''' and '''/etc/group''' files

|-
|| 13:29
|| The video available at the following link summarises the Spoken Tutorial project.

Please download and watch it.
|-
|| 13:38
|| The Spoken Tutorial Project team conducts workshops using spoken tutorials and gives certificates.

For more details, please write to us.
|-
|| 13:50
|| Pls post your timed queries in this Forum.
|-
|| 13:54
|| Spoken Tutorial Project is funded by NMEICT, MHRD, Government of India.

|-
|| 14:00
|| The script has been contributed by Antara And this is Praveen from IIT Bombay signing off.

Thanks for joining.
|-
|}

Linux-for-Sys-Ads/C2/Modifying-User-Account/English-timed - Revision history

PoojaMoolya: Created page with "{| border=1 |- || '''Time''' || '''Narration''' |- || 00:01 || Hello and welcome to the spoken tutorial on '''Modifying User Account in Linux.''' |- || 00:08 || In this tuto..."