Im trying to format the last command to tell me just the user names, logins, and the time that they were logged in. So far I got the users logins using a loop that counts the amount of times a user logged in but im not sure how to start the time array. The time im trying to use is the last field when the last command is entered. Any help would be appreciated.
Here is some code I have atm:
Code:
BEGIN{print "USER" "\t" "LOGINS" "\t" "TIME"}
{count[$1]++}
END {
for (name in count)
print name "\t " count[name]
}
Not sure about the title if someone has a better name for it please lemme know and I will edit the title.
I have several (10+ files) which look something like:
File 1:
12/28/2009 04:0 8
12/28/2009 04:4 4
12/28/2009 05:0 4
.
.
.
File 2:
12/28/2009 04:1 7
12/28/2009 04:2 3... (2 Replies)
Hi everyone,
I was wondering if it's possible to read a file ("file2" in my example) more than once. In this example I want to print file2 entirely for each lines of file1:
awk -F$'\t' '{
print $0
while ((getline < "file2") > 0) {
print "\t"$0
}
}' file1
It... (4 Replies)
By "many many times" I mean the times the input file is to be processed is unknown beforehand, it will be known when awk finishes processing the input file for the first time.
So my question is: how to start over again from the first record of the input file when AWK finishes processing the... (7 Replies)
All,
I have a test file as specified below. 1st col is <arrival time> and 2nd col is <Page #>. I want to find the inter-arrival time of requests for each page # (I've done this part already). Once I have this, I want to calculate the average interarrival time. Note, that I am trying to have the... (11 Replies)
Hi,
I'm trying to create an XML sitemap of our dynamic ecommerce sites SEO Friendly URLs and am trying to create the initial page listing.
I have a CSV file that looks like the following and need duplicate the lines based on a value which needs calculating.
... (2 Replies)
Hello,
i'm trying to implement the times() function and i'm programming in C.
I'm using the "struct tms" structure which consists of the fields:
The tms_utime structure member is the CPU time charged for the execution of user instructions of the calling process.
The tms_stime structure... (1 Reply)
Hi,
I am trying to get lines between the last occurrences of two patterns. I have files that have several occurrences of “Standard” and “Visual”. I will like to get the lines between “Standard” and “Visual” but I only want to retain only the last one e.g.
Standard
Some words
Some words
Some... (4 Replies)
Pattern:
Mary walks at the park every day with her children
sed 's/$/ /'
will make it add 1 space at the end (trailing)
I want to add X ($VARIABLE) number of spaces (which comes from RANDOM)
i.e.
VARIABLE='14'
then it will do:
sed 's/$/ /'
= 14 spaces added at the... (10 Replies)
Discussion started by: holyearth
10 Replies
LEARN ABOUT LINUX
lastb
LAST,LASTB(1) Linux System Administrator's Manual LAST,LASTB(1)NAME
last, lastb - show listing of last logged in users
SYNOPSIS
last [-R] [-num] [ -n num ] [-adFiowx] [ -f file ] [ -t YYYYMMDDHHMMSS ] [name...] [tty...]
lastb [-R] [-num] [ -n num ] [ -f file ] [-adFiowx] [name...] [tty...]
DESCRIPTION
Last searches back through the file /var/log/wtmp (or the file designated by the -f flag) and displays a list of all users logged in (and
out) since that file was created. Names of users and tty's can be given, in which case last will show only those entries matching the
arguments. Names of ttys can be abbreviated, thus last 0 is the same as last tty0.
When last catches a SIGINT signal (generated by the interrupt key, usually control-C) or a SIGQUIT signal (generated by the quit key, usu-
ally control-), last will show how far it has searched through the file; in the case of the SIGINT signal last will then terminate.
The pseudo user reboot logs in each time the system is rebooted. Thus last reboot will show a log of all reboots since the log file was
created.
Lastb is the same as last, except that by default it shows a log of the file /var/log/btmp, which contains all the bad login attempts.
OPTIONS -f file
Tells last to use a specific file instead of /var/log/wtmp.
-num This is a count telling last how many lines to show.
-n num The same.
-t YYYYMMDDHHMMSS
Display the state of logins as of the specified time. This is useful, e.g., to determine easily who was logged in at a particular
time -- specify that time with -t and look for "still logged in".
-R Suppresses the display of the hostname field.
-a Display the hostname in the last column. Useful in combination with the next flag.
-d For non-local logins, Linux stores not only the host name of the remote host but its IP number as well. This option translates the
IP number back into a hostname.
-F Print full login and logout times and dates.
-i This option is like -d in that it displays the IP number of the remote host, but it displays the IP number in numbers-and-dots nota-
tion.
-o Read an old-type wtmp file (written by linux-libc5 applications).
-w Display full user and domain names in the output.
-x Display the system shutdown entries and run level changes.
NOTES
The files wtmp and btmp might not be found. The system only logs information in these files if they are present. This is a local configura-
tion issue. If you want the files to be used, they can be created with a simple touch(1) command (for example, touch /var/log/wtmp).
FILES
/var/log/wtmp
/var/log/btmp
AUTHOR
Miquel van Smoorenburg, miquels@cistron.nl
SEE ALSO shutdown(8), login(1), init(8)
Jul 31, 2004 LAST,LASTB(1)