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Top Forums UNIX for Dummies Questions & Answers Capping output redirection log file length Post 302361261 by Scrutinizer on Monday 12th of October 2009 07:31:30 PM
Old 10-12-2009
You could try:

Code:
logfile=/tmp/etc/vpnc/Status.$vpn_keepalive_host1
echo `date` "$vpn_keepalive_host1 unreachable" |cat $logfile - |tail -200> $logfile

or e.g.
Code:
log200 () {
  echo "$1"|cat "$2" -|tail -200>"$2"
}

log200 "`date` $vpn_keepalive_host1 unreachable"  /tmp/etc/vpnc/Status.$vpn_keepalive_host1

 

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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 1.44.1 March 2018 LOGSAVE(8)
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