Write a shell script to show that user is logged in or not?

Nicola Kunze asked a question: Write a shell script to show that user is logged in or not?
Asked By: Nicola Kunze
Date created: Mon, Mar 8, 2021 8:30 PM

Content

FAQ

Those who are looking for an answer to the question «Write a shell script to show that user is logged in or not?» often ask the following questions:

😳 Are shell commands logged?

The shell sets the default value to 500 after reading any startup files. There is no such log, at least not by default. There are tools you can install, like acct ("GNU Accounting utilities for process and login accounting") which can keep track of all programs executed on the system.

😳 How do i write a shell script?

  • To successfully write a shell script, you have to do three things: Write a script. Give the shell permission to execute it. Put it somewhere the shell can find it.

😳 Can you provide a linux shell script that prints the current user id?

#/bin/bash export UNAME=whoami export USERID=id -u $UNAME echo $USERID

1 other answer

You don't need a shell script for that; use either 'whoami' or 'id'

Your Answer

We've handpicked 22 related questions for you, similar to «Write a shell script to show that user is logged in or not?» so you can surely find the answer!

Write a shell script that counts the no of lines and words in a file?

You don't need a script, just use the 'wc' command:

Lines

wc -l <file>

Words

wc -w <file>

Read more

How do i write the output of a shell script?

  1. #!/bin/bash.
  2. #Script to write the output into a file.
  3. #Create output file, override if already present.
  4. output=output_file.txt.
  5. echo "<<<List of Files and Folders>>>" | tee -a $output.
  6. #Write data to a file.
  7. ls | tee $output.
  8. echo | tee -a $output.

Read more

How do you write an argument in a shell script?

Arguments or variables may be passed to a shell script. Simply list the arguments on the command line when running a shell script. In the shell script, $0 is the name of the command run (usually the name of the shell script file); $1 is the first argument, $2 is the second argument, $3 is the third argument, etc...

Read more

How do you write to a file in shell script?

  1. #!/bin/bash.
  2. #Script to write the output into a file.
  3. #Create output file, override if already present.
  4. output=output_file.txt.
  5. echo "<<<List of Files and Folders>>>" | tee -a $output.
  6. #Write data to a file.
  7. ls | tee $output.
  8. echo | tee -a $output.

Read more

How to write a bash script that takes arguments?

  • Run the bash file with three numeric argument values. Create a bash file and add the following code to count the total number of characters of any file. Here, filename will be passed as command line argument. Run the bash script with the filename as single argument value and run another command to check the total number of characters of that file.

Read more

How do you write an if else condition in shell script?

  1. if statement. This block will process if specified condition is true…
  2. if-else statement…
  3. if..elif..else..fi statement (Else If ladder) ...
  4. if..then..else..if..then..fi..fi..(Nested if) ...
  5. Syntax: case in Pattern 1) Statement 1;; Pattern n) Statement n;; esac…
  6. Example 2:

Read more

How do you write and call a function in shell script?

You need to define your functions before you call them. Using () : process_install() { echo "Performing process_install() commands, using arguments [${*}]..." } process_exit() { echo "Performing process_exit() commands, using arguments [${*}]..." }

Read more

Write a shell script to check if you are root or not?

[ $UID -ne 0] # Checks if the user ID is not 0 (root UID)

Read more

Write a shell script to direct the odd and even numbersgiven by the user to the respective files name oddtxt and eventxt?

Here is that kind of script: #!bin/bash

Checking parameters number, we need two parameters

if [ $# -ne 1 ] then echo "Wrong number of parameters, please try again." exit 1 fi

Checking if number is odd or even

if [ $[$1 % 2] -eq 0 ] then echo "Even"

Write number to even.txt file

echo $1 >> even.txt else echo "Odd"

Write number to odd.txt file

echo $1 >> odd.txt fi exit 0 This bash script accepts one parameter - number and if number is even it is written into end of even.txt file and if odd into odd.txt.

Read more

Shell script to count the number of vowels in a string entered by user?

clear echo -n "Enter the Name / String:" while : do read name echo $name | awk '{print gsub(/[aeiou]/,"")}' done

Read more

Is shell script bash?

Bash is a Unix shell and command language written by Brian Fox for the GNU Project as a free software replacement for the Bourne shell. Bash can also read and execute commands from a file, called a shell script…

Read more

Is shell script hard?

Shell scripting is not particularly difficult for those with the prerequisites. No experience with the underlying commands available — if you don't know how to use the individual tools nor even what problems they solve then it is of course difficult to put them together in a script.

Read more

What is shell script?

  • A shell script is a text file that contains a sequence of commands for a UNIX-based operating system.

Read more

Is shell script and batch script same?

A batch file is a script file in DOS, OS/2 and Microsoft Windows. It consists of a series of commands to be executed by the command-line interpreter, stored in a plain text file… Unix-like operating systems, such as Linux, have a similar, but more flexible, type of file called a shell script.

Read more

When a shell script is executed shell?

  1. Open the terminal. Go to the directory where you want to create your script.
  2. Create a file with . sh extension.
  3. Write the script in the file using an editor.
  4. Make the script executable with command chmod +x <fileName>.
  5. Run the script using ./<fileName>.

Read more

Write a shell script which deletes all line containing the word unix in the filesn suppiled as argument to this shell script?

SS29

Script to delete all lines containing the word 'unix' from

files supplied as arguments

Usage: SS29 file1 file2 file3 ...

if [$# -lt 2] then echo Insufficient arguments exit fi for file do grep -v unix $file>/temp/$file cp /temp/$file $file done

Read more

Write a shell script that counts a number of unique word contained in the alphabetical order line by line?

use python, shell is stupid

Read more

Write a shell script that prints a list of every unique word in a file in reverse alphabetical order?

cat FILE | awk 'gsub(/ /,"\n") gsub("\n","\n") {print}' | sort -ur

Read more

How do you write a script which lists the 10 shell system variables?

You don't need a shell script to do that. Since you don't say what 10 shell variables you want, you can list them all by using the 'set' command to list all known in-use shell variables in the current session.

Read more

How do you write a shell script to enlist the processes being run?

#!/bin/sh PS -a

Read more

How do i find my user shell?

cat /etc/shells – List pathnames of valid login shells currently installed. grep "^$USER" /etc/passwd – Print the default shell name. The default shell runs when you open a terminal window. chsh -s /bin/ksh – Change the shell used from /bin/bash (default) to /bin/ksh for your account.

Read more

What is a shell script or shell scripting?

  • A shell script is a computer program designed to be run by the Unix shell , a command-line interpreter. The various dialects of shell scripts are considered to be scripting languages. Typical operations performed by shell scripts include file manipulation, program execution, and printing text.

Read more