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Connected time on UNIX

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# 1  
Old 01-20-2014
Connected time on UNIX
Hello,

A question please.

Could anyone tell me how to know the connected time for a user on unix ?

I'd need to know this information for several days.

Is there a command to get it ?

Thanks in advance
# 2  
Old 01-20-2014
For an interactive shell with a terminal:
Code:
who am i

Further you can query the current shell process for elapsed time and start time:
Code:
ps -p $$ -o etime
ps -p $$ -o stime

BTW you can suppress the header line with
Code:
ps -p $$ -o etime=
ps -p $$ -o stime=

Last edited by MadeInGermany; 01-20-2014 at 08:05 AM..
# 3  
Old 01-20-2014
Thanks MadeInGermany.

Do you know how could I query for passed days, for example 18/01 and 19/01 ?

greetings
# 4  
Old 01-20-2014
Hmm, date calculation can become complicated.
GNU date has
Code:
date --date "-1 days"
date --date "-2 days"

On standard Unix you should have a look at
Yesterdays Date/Date Arithmetic | Unix Linux Forums | Answers to Frequently Asked Questions
An example to check the current process' etime against the two previous days:
Code:
etime=`ps -p $$ -o etime=`
case $etime in
(*-*) edays=${etime%-*};;
(*) edays=0;;
esac
if [ $edays -eq 1 -o $edays -eq 2 ]; then
  echo "the current process is 1-2 days old"
fi

NB some of these expressions only work in Posix shells (ksh, bash, zsh).
Last edited by MadeInGermany; 01-20-2014 at 08:36 AM.. Reason: bug fix
# 5  
Old 01-20-2014
Did you try the last command?
# 6  
Old 01-20-2014
Hi Rudic,

I tried LAST command, but I only get the users logged in today only, not for passed days.

I am not an experimented guy on unix.

Thanks
# 7  
Old 01-20-2014
man last:
Quote:
DESCRIPTION Last searches back through the file /var/log/wtmp (or the file desig- nated by the -f flag) and displays a list of all users logged in (and out) since that file was created.
What be the creation date of your /var/log/wtmp?
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