Hi all,
How can I quickly show Nth line from the huge file(at least more than 15GB)? I used the following script but seems slower.
See 2717298 th line.
head -2717298 data0802.dat | tail -1
Thank you very much (4 Replies)
I know how to read a file line by line. But don't to how to skip to a line matching a criteria and then continue reading it till the end.
This is a log file. The input is a timestamp.
1. Find the timestamp in the log file
2. Read the remaining lines one at a time till EOF.
How can I do... (9 Replies)
For example i'm having the below contents in a file:
expr is great when you want to split a string into just two parts. The .* also makes expr good for skipping a variable number of words when you don't know how many words a string will have. But expr is lousy for getting, say, the fourth word... (2 Replies)
Hi,
For my reuirement, I have to read a file from the 2nd line till the last line<EOF>.
Say,
I have a file as test.txt, which as a header record in the first line followed by records in rest of the lines.
for i in `cat test.txt`
{
echo $i
}
While doing the above loop, I have read... (5 Replies)
Is there an awk script that can easily perform the following operation?
I have a data file that is in the format of
1944-12,5.6
1945-01,9.8
1945-02,6.7
1945-03,9.3
1945-04,5.9
1945-05,0.7
1945-06,0.0
1945-07,0.0
1945-08,0.0
1945-09,0.0
1945-10,0.2
1945-11,10.5
1945-12,22.3... (3 Replies)
Hi..
May be a simple question but I just began to write unix scripts a week ago, for sorting some huge amount of experiment data, so I got no common sense about unix scripting and really need your helps...
The situation is, I want to read the nth word of mth line in a file, and then store it... (3 Replies)
I have a script which reads from a job file and executed the scripts in the job file in sequence.
#! /bin/ksh
set -x
while read line
do
$line.ksh
if
# mail the team
fi
done <"$file"
The job file will be like
abcd
efgh
ijkl
mnop
qrst
This is working fine. I need to add... (2 Replies)
Bash/Oracle Linux 6.4
A basic requirement.
How can I get nth line of a file printed ? Can I use grep in this case ?
Example:
In the below file, 12th line is "Kernel parameter check passed for rmem_max" . I just want the 12 line to be printed.
# cat sometext.txt
Kernel version check... (2 Replies)
Hi All,
I am using UNix Sun OS sun4u sparc SUNW,SPARC-Enterprise
My intention is to insert a line of text after 13th line of every file inside a particular directory.
While trying to do it for a single file , i am using sed
sed '3 i this is the 4th line' filename
sed: command garbled: 3... (5 Replies)
My file (the output of an experiment) starts off looking like this,
_____________________________________________________________
Subjects incorporated to date: 001
Data file started on machine PKSHS260-05CP
**********************************************************************
Subject 1,... (9 Replies)
Discussion started by: samonl
9 Replies
LEARN ABOUT OPENSOLARIS
acctcon2
acctcon(1M) System Administration Commands acctcon(1M)NAME
acctcon, acctcon1, acctcon2 - connect-time accounting
SYNOPSIS
/usr/lib/acct/acctcon [-l lineuse] [-o reboot]
/usr/lib/acct/acctcon1 [-p] [-t] [-l lineuse] [-o reboot]
/usr/lib/acct/acctcon2
DESCRIPTION
acctcon converts a sequence of login/logoff records to total accounting records (see the tacct format in acct.h(3HEAD)). The login/logoff
records are read from standard input. The file /var/adm/wtmpx is usually the source of the login/logoff records; however, because it might
contain corrupted records or system date changes, it should first be fixed using wtmpfix. The fixed version of file /var/adm/wtmpx can then
be redirected to acctcon. The tacct records are written to standard output.
acctcon is a combination of the programs acctcon1 and acctcon2. acctcon1 converts login/logoff records, taken from the fixed /var/adm/wtmpx
file, to ASCII output. acctcon2 reads the ASCII records produced by acctcon1 and converts them to tacct records. acctcon1 can be used with
the -l and -o options, described below, as well as with the -p and -t options.
OPTIONS -p Print input only, showing line name, login name, and time (in both numeric and date/time formats).
-t acctcon1 maintains a list of lines on which users are logged in. When it reaches the end of its input, it emits a session
record for each line that still appears to be active. It normally assumes that its input is a current file, so that it uses
the current time as the ending time for each session still in progress. The -t flag causes it to use, instead, the last time
found in its input, thus assuring reasonable and repeatable numbers for non-current files.
-l lineuse lineuse is created to contain a summary of line usage showing line name, number of minutes used, percentage of total elapsed
time used, number of sessions charged, number of logins, and number of logoffs. This file helps track line usage, identify
bad lines, and find software and hardware oddities. Hangup, termination of login(1) and termination of the login shell each
generate logoff records, so that the number of logoffs is often three to four times the number of sessions. See init(1M) and
utmpx(4).
-o reboot reboot is filled with an overall record for the accounting period, giving starting time, ending time, number of reboots, and
number of date changes.
EXAMPLES
Example 1 Using the acctcon command.
The acctcon command is typically used as follows:
example% acctcon -l lineuse -o reboots < tmpwtmp > ctacct
The acctcon1 and acctcon2 commands are typically used as follows:
example% acctcon1 -l lineuse -o reboots < tmpwtmp | sort +1n +2 > ctmp
example% acctcon2 < ctmp > ctacct
FILES
/var/adm/wtmpx History of user access and administration information
ATTRIBUTES
See attributes(5) for descriptions of the following attributes:
+-----------------------------+-----------------------------+
| ATTRIBUTE TYPE | ATTRIBUTE VALUE |
+-----------------------------+-----------------------------+
|Availability |SUNWaccu |
+-----------------------------+-----------------------------+
SEE ALSO acctcom(1), login(1), acct(1M), acctcms(1M), acctmerg(1M), acctprc(1M), acctsh(1M), fwtmp(1M), init(1M), runacct(1M), acct(2),
acct.h(3HEAD), utmpx(4), attributes(5)NOTES
The line usage report is confused by date changes. Use wtmpfix (see fwtmp(1M)), with the /var/adm/wtmpx file as an argument, to correct
this situation.
During a single invocation of any given command, the acctcon, acctcon1, and acctcon2 commands can process a maximum of:
o 6000 distinct session
o 1000 distinct terminal lines
o 2000 distinct login names
If at some point the actual number of any one of these items exceeds the maximum, the command will not succeed.
SunOS 5.11 22 Feb 1999 acctcon(1M)