Últimamente andaba buscando la forma de colorear la salida de tail para poder leer más fácilmente los logs de mis máquinas. Ayer encontré esta página de
"trucos sucios y rápidos" la solución. Para usar el script, copiarlo a algún lugar del PATH de vuestra máquina (p.e. /usr/local/bin) dadle permiso de ejecución y ejecutrarlo de la siguiente manera:
tail -f /var/log/messages | colorlog.pl
Enseguida notaréis la diferencia ;)
#!/usr/bin/perl
$black = "\033[30m";
$red = "\033[31m";
$green = "\033[32m";
$yellow = "\033[33m";
$blue = "\033[34m";
$magenta = "\033[35m";
$purple = "\033[35m";
$cyan = "\033[36m";
$white = "\033[37m";
$darkgray = "\033[30m";
@word_good=("starting\n", "Freeing", "Detected", "starting.", "accepted.\n", "authenticated.\n", "Ready", "active", "reloading", "saved;", "restarting", "ONLINE\n");
@word_warn=("dangling", "closed.\n", "Assuming", "root", "root\n", "exiting\n", "missing", "Ignored", "adminalert:", "deleting", "OFFLINE\n");
@word_bad=("bad");
@word_note=("LOGIN", "DHCP_OFFER", "optimized", "reset:", "unloaded", "disconnected", "connect", "Successful", "registered\n");
@line_good=("up", "DHCP_ACK", "Cleaned", "Initializing", "Starting", "success", "successfully", "alive", "found", "ONLINE\n");
@line_warn=("warning:", "WARNING:", "invalid", "obsolete", "bad", "Password", "detected", "timeout", "timeout:", "attackalert:", "wrong", "Lame", "FAILED", "failing", "unknown", "obsolete", "stopped.\n", "terminating.", "disabled\n", "disabled", "Lost");
@line_bad=("DENY", "lost", "shutting", "dead", "DHCP_NAK", "failure;", "Unable", "inactive", "terminating", "refused", "rejected", "down", "OFFLINE\n", "error\n", "ERROR\n", "ERROR:", "error", "ERROR", "error:", "failed:");
@daemons=("named");
$col_good = $green;
$col_warn = $yellow;
$col_bad = $red;
$col_note = $purple;
$col_norm = "\033[00m";
$col_background = "\033[07m";
$col_brighten = "\033[01m";
$col_underline = "\033[04m";
$col_blink = "\033[05m";
$col_default = "$col_norm$white";
print "$col_norm$cyan";
$datespace=0;
mainloop: while (<>)
{
$thisline = $_;
$timestamp = substr($_,0,15);
s/................//;
@rec = split (/ /, $_);
$output="$col_brighten$cyan$timestamp";
$output.=" $col_brighten$blue$rec[0]";
if ($rec[1] eq "last")
{
$output.="$col_norm$green last message repeated ";
$output.="$col_brighten$rec[4]$col_norm$green times\n";
print "$output$col_default";
next mainloop;
}
if ($rec[1] =~ /\[(\d+)\]\:/)
{
my($pid) = $1;
$rec[1]=~s/\[$1\]\:// ;
$output .= "$col_norm$green $rec[1]" .
"$col_brighten$green\[";
$output .= "$col_brighten$white$pid" .
"$col_brighten$green\]: ";
}
else {
$output .= "$col_norm$green $rec[1] ";
}
$restcolor="$col_norm$cyan";
$restoftheline="";
for ($therest=(2); $therest<=$#rec; $therest++)
{ $highlight=0;
for ($i=0; $i<=$#word_good; $i++)
{ if ($word_good[$i] eq $rec[$therest])
{ $restoftheline.="$col_brighten$col_good"; $highlight=1; }
}
for ($i=0; $i<=$#word_warn; $i++)
{ if ($word_warn[$i] eq $rec[$therest])
{ $restoftheline.="$col_brighten$col_warn"; $highlight=1; }
}
for ($i=0; $i<=$#word_bad; $i++)
{ if ($word_bad[$i] eq $rec[$therest])
{ $restoftheline.="$col_brighten$col_bad"; $highlight=1; }
}
for ($i=0; $i<=$#word_note; $i++)
{ if ($word_note[$i] eq $rec[$therest])
{ $restoftheline.="$col_brighten$col_note"; $highlight=1; }
}
for ($i=0; $i<=$#line_good; $i++)
{ if ($line_good[$i] eq $rec[$therest])
{ $restcolor="$col_norm$col_good";
$restoftheline.="$col_brighten$col_good"; $highlight=1; }
}
for ($i=0; $i<=$#line_warn; $i++)
{ if ($line_warn[$i] eq $rec[$therest])
{ $restcolor="$col_norm$col_warn";
$restoftheline.="$col_brighten$col_warn"; $highlight=1; }
}
for ($i=0; $i<=$#line_bad; $i++)
{ if ($line_bad[$i] eq $rec[$therest])
{ $restcolor="$col_norm$col_bad";
$restoftheline.="$col_brighten$col_bad"; $highlight=1; }
}
$restoftheline.="$rec[$therest] ";
if ($highlight == 1)
{ $restoftheline.=$restcolor; }
}
$output.="$restcolor$restoftheline";
print "$output$col_default\033[1G";
}
exit(0);
