Please use CODE tags when displaying sample input, output, and code segments.
The <<< redirection operator and the ${var:start:count} and ${var:start} substring parameter expansions are extensions to the standards that are provided by some, but not all, shells.
The <<< "string" redirection operator feeds the string string followed by a <newline> character to the standard input of the command it follows.
The substring parameter expansion ${var:start[:count]} expands to the count characters (all characters if :count is not specified) starting with the character at the position specified by start (where 0 is the first character in the expansion ${var}). So, ${UserName:0:1} gives you the 1st character of $UserName and ${UserName:1} gives you the remaining characters in $UserName.
The the tr '[:lower:]' '[:upper:]'translates lowercase characters read from standard input to the corresponding uppercase letters on standard output. Characters read from standard input that are not lowercase letters are copied to standard output unchanged.
The outer command substitution using echo to print the output from the inner command substitution and substring parameter expansion is not needed. It could be more succinctly written as:
to assign the variable PassWord the user's login name with the 1st character translated to an uppercase character if it started with a lowercase letter; or to the user's login name (unchanged) if it did not start with a lowercase letter.
echo -e "Enter in a username : \c"
read username
grep "^$username:" /etc/passwdWhat I'm trying to do is take in a username from my script and I need to be able to check if that username already exists. If it does the script should display a message saying that the user already exists and exit.
... (2 Replies)
I want to create a shell script for a menu selection consisting of users defined on the machine. To an administrator having the privileges, the selection menu will look as follows:
Select the user you want to define the variables for:
1) my-username-1
2) my-username-2
etc
Then there would be a... (7 Replies)
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Hi,
I am looking for a way of creating multiple directories using the mkdir -p command in a shell script.
I'm working with an Ubuntu machine and try to do something like that:
#!/bin/sh
... (3 Replies)
Hi, I am a new on this forum but i like :) I need a script in bash which will be crating a new user with folder for websites. For example: I will run this program and he creating a new user(with my name) and folder whcich name like user and if i will localho/~user in browser, she show me files from... (1 Reply)
Hello Everybody
i am a newbie to the bash scripting.please can someone help me out here.i want to write a script on creating 10 users with passwords and comparing the users to the ones in /etc/passwd file.am i gonna use arrays in creating the 10 users or what?and again, how do i compare both... (1 Reply)
I need somebody who could help with an exercise.
You have a text file called users.txt with this info inside:
users.txt:
user1:1234:/home/homedir1 ;
user2:1234:/home/homedir2 ;
user3:1234:/home/homedir3 ;
user4:1234:/home/homedir4 ;
The script should create an user using the... (2 Replies)
Hi friends could you please share me the script to create more users in one server except newusers, is there any option to change secondary group and how to print passwd and changing the age all these things how can i edit in newsers.. please help me (0 Replies)
Hi,
I have a file with usernames, and the comment section, e.g :
Data removed by request of sanchitadutta91, 20 May 2020
I need to add these users into a server. Is it possible to use a script to create the users, together with the comment ?
From the commandline to add one user, the... (2 Replies)