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Top Forums Shell Programming and Scripting Delete lines where line length is < x Post 302437136 by alister on Wednesday 14th of July 2010 05:35:40 AM
Old 07-14-2010
Quote:
Originally Posted by ensameer
Here you go.
Code:
#!/bin/ksh
set -x
logfile=$dir/logfilename.txt
thr=100
cat $logfile | while read a
do
nochar = `echo $a | wc -c`
sleep 1
if (( $nochar < $thr )) then
echo echo "$a" >>new.logfile.log
else "no. of chars less than 10";
fi
done

That read command will discard leading and trailing whitespace and mishandle any occurrences of a backslash, leading to erroneous line length counts. Also, by using ${#a}, you can determine length without using wc.

Code:
while IFS= read -r a; do
    [ ${#a} -ge 100 ] && echo "$a"
done < "$logfile" >> "$logfile".new

Regards,
Alister

Last edited by alister; 07-14-2010 at 06:45 AM..
 

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LOGSAVE(8)						      System Manager's Manual							LOGSAVE(8)

NAME
logsave - save the output of a command in a logfile SYNOPSIS
logsave [ -asv ] logfile cmd_prog [ ... ] DESCRIPTION
The logsave program will execute cmd_prog with the specified argument(s), and save a copy of its output to logfile. If the containing directory for logfile does not exist, logsave will accumulate the output in memory until it can be written out. A copy of the output will also be written to standard output. If cmd_prog is a single hyphen ('-'), then instead of executing a program, logsave will take its input from standard input and save it in logfile logsave is useful for saving the output of initial boot scripts until the /var partition is mounted, so the output can be written to /var/log. OPTIONS
-a This option will cause the output to be appended to logfile, instead of replacing its current contents. -s This option will cause logsave to skip writing to the log file text which is bracketed with a control-A (ASCII 001 or Start of Header) and control-B (ASCII 002 or Start of Text). This allows progress bar information to be visible to the user on the console, while not being written to the log file. -v This option will make logsave to be more verbose in its output to the user. AUTHOR
Theodore Ts'o (tytso@mit.edu) SEE ALSO
fsck(8) E2fsprogs version 1.41.11 March 2010 LOGSAVE(8)
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