12-03-2008
fast way to retreive a list of lines
hi there,
i have to read lines [ time-stamps ] from the file, where the line is just above the pattern am looking for
typically this looks like this
<time-stamp>|-----
<pattern am searching >......
<time-stamp>|.....
<some garbage >
....
the log file is big [2M lines ]
wc -l ~/log/ompe.log.20081203
2808766
after getting the list of line numbers here the pattern is
am trying to read time-stamps from the perticualr line using
for line_no in `cat /tmp/jms1`
do
prv_line_no=$(expr $line_no - 1 )
sed -n "${prv_line_no}p" $1 >> /tmp/jms_times
# head -${prv_line_no} $1 | tail -1 >> /tmp/jms_times1
done
sed option is very slow , on the other hand using head/tail option is fast inatially but as the line number is increases the retreval slows down
is there any fast way to retreive a perticular line number
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LEARN ABOUT DEBIAN
setmaillist
setmaillist(1) General Commands Manual setmaillist(1)
NAME
setmaillist - create a binary mailing list
SYNOPSIS
setmaillist bin tmp
DESCRIPTION
setmaillist reads a mailing list from its standard input.
setmaillist writes the mailing list in a binary format to tmp; it then moves tmp to bin. tmp and bin must be on the same filesystem.
If there is a problem creating tmp, setmaillist complains and leaves bin alone.
The binary mailing list format is portable across machines.
setmaillist always creates bin world-readable.
MAILING LIST FORMAT
The mailing list read by setmaillist is a series of lines. NUL bytes are not allowed.
If a line begins with a dot or slash, setmaillist takes the entire line as an include file name.
If a line begins with an ampersand, setmaillist takes the rest of the line as a recipient address. If a line begins with a letter or num-
ber, setmaillist takes the entire line as a recipient address. Each recipient address must include a fully qualified domain name. Recipi-
ent addresses longer than 800 bytes are not allowed.
setmaillist ignores blank lines and lines beginning with #. It also ignores spaces and tabs at the ends of lines.
For example,
god@heaven.af.mil
djb@silverton.berkeley.edu
is a mailing list with two addresses.
SEE ALSO
setforward(1), newinclude(1), printmaillist(1)
setmaillist(1)