August 2000
Intermediate to advanced
816 pages
29h 45m
English
book
Linux in a Nutshell, Third Edition
by Ellen Siever, Stephen Spainhour, Jessica P. Hekman, Stephen Figgins
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Name
usermod
Synopsis
usermod [options] user
Description
System administration command. Modify user account information.
Options
- -c comment
Comment field.
- -d dir
Home directory.
- -e date
Account expiration date. date is in the format MM/DD/YYYY. Two-digit year fields are also accepted, but the value is stored as the number of days since January 1, 1970. This option requires the use of shadow passwords.
- -f days
Permanently disable account this many days after the password has expired. A value of -1 disables this feature. This option requires the use of shadow passwords.
- -g group
Initial group name or number.
- -G groups
Supplementary groups given by name or number in a comma-separated list with no whitespace. user will be removed from any groups to which they currently belong that are not included in groups.
- -l name
Login name. This cannot be changed while the user is logged in.
- -o
Override. Accept a nonunique uid with the -u option.
- -s shell
Login shell.
- -u uid
Numerical user ID. The value must be unique unless the -o option is used. Any files owned by user in the user’s home directory will have their user ID changed automatically. Files outside of the home directory will not be changed. user should not be executing any processes while this is changed.
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I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
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