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i want to monitor which users logged in to unix system if users who logged in more than once then store to a text file .
any idea?

i want check the user input and make sure only
alphabetic characters and spaces how i can do that?

"enter something"
read input

i want check the $input . how ?

if i only want to check the first digit wheter is a number "0" or not .
how to do it

sorry , i have tried , now it works.
thank you for u help :b:

Bash : how do i check the user input and make sure is only character or only number ?

how to i grep a keyword which ignore upper case or lower case.
for an example :
user enter CoUcH
and the grep also can grep couch which in text.txt although upper or loever case is different .....

=.= but i want the output like this
1)help
2)go
3)play

text file name records :

1)help
2)go

now i want to add 1 3)play to the last line
if i type you command it will become

1)help
2)go3)play

ur command seem just add at thel last line behind the text , if i want add to a new line ? how

i want to combine 2 user inputs and add to the last line of text file
for an example :
enter input1
enter input2
then i want input1 input2 add to the last line of text file
anyone help me?