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Is it possible to find out the history of recently typed in commands of a particular user in a multi user system?

the history command expects a numeric argument with it. is it possible to find out...

thanks a lot mate

Is there anyway in which i can set a permanent global variable in unix, which when initialised with a value and modified during any shell script, would retain its value even if i logout and login
...

is there any way to reflect this change in the original file?

i have this following file named test.txt whose content is

Hello
World

Whats Up?


and i execute the following command
x="Hey"
awk -v LINE=3 -v COL=1 -v VAL="x" '{ if(NR == LINE)...

i dont find any change in the file after i execute this command

TRY THIS
x=`grep -w "Hello World" data.out | wc -l`

if test $x -eq 0 ; then
echo "String not found"
else
echo "String found"
fi

Given a particular line number and a corresponding column number, can i write something in the file during run time?

For example x=1 and during runtime i want to write the value of x in column...

actually the problem with who is that if for example there is a user named Jonathan_Smith, then `who` does not display the full user name ..It only displays the 1st 8-9 characters. So if i redirect...

in a multi user system of 3 users X,Y,Z, if i know that X is presently online, is it possible to determine for how long has he been online? i mean the time duration

without using find .. or for that matter without using conventional file searching commands

without using conventional file searching commands like find etc, is it possible to locate a file if i just know that the file that i'm searching for contains a particular text like "Hello world" or...

if i want to display the contents of a file between say line number 3 and 10 then i use the following command

sed -n '3,10p' filename

if this 3 was contained in x and 10 was contained in y then...

thanks a lot guys.

i have applied the following command on a file named unix.txt that contains the string "linux from the text"
grep -n -i -w "linux from the text" unix.txt

and the result is
5:Today's Linux from...

Write a shell script which checks continuously with a specified interval whether a particular person
is logged in or not. The login name should be supplied as an argument to the shell script at the...

Write a shell script which checks continuously with a specified interval whether a particular person
is logged in or not. The login name should be supplied as an argument to the shell script at the...

thanks a lot

the problem statement is

Write a shell script, which gets executed the moment the user opens a terminal. It should display the message "Hello your_name, welcome to 172.16.4.120...

thanks so much...works perfectly...thanks a lot :)

echo "hello123" | tr -dc '[0-9]' | wc -c

using this command i can count the no of times a number from 0-9 occurs in the string "hello123"
but how do i save this result inside a variable?

if i...