To check Javascript error, use Firefox Web Developer Addon
Tool -> Error Console
Got javascript error as “missing ; before statement” although there was no missing “;”
Finally found the reason is that the javascript function used number at the beginning, like
2way_func = function(){ …..}
Calculate sum of the file size
ls -l access_log.2008-12-20*|gawk ‘{a+=$5;} END {print a;}’
Edit special lines using regular expression
awk ‘/aaa/ ‘ filename
Change file names using sed
##Example: from access_log.2008-12-20.01.gz.1 to access_log.2008-12-20.01.1.gz
for file in `ls access_log.2008-12-20.*`
do
newname=`echo $file|sed ‘s/\(access_log.2008-12-20.[0-9][0-9]\).gz.\([0-9]*\)/\1.\2.gz/’`
size=`ls -l $file|awk ‘{print $5}’`
if [ $size -gt 100 ];then
echo “$file-> $newname”
fi
mv -v $file $newname
done
trim
get rid of space, \n and \r, etc
$login = trim($_POST[‘user_login’]);
To define an Array
$prod = array(
“prod1” => array(“id”=>”prod001″,”date” => “111208”, “name”=>”aaa”);
“prod2” => array(“id”=>”prod002″,”date” => “111108”, “name”=>”bbb”);
“prod3 => array(“id”=>”prod003″,”date” => “111008”, “name”=>”ccc”);
);
To read values out
foreach($sval1 as $key2 => $val2){
if($key2==”id”) echo “ID: $val2[0]\n”;
}
}
foreach($data as $value){
echo $value.”\n”;
}
Push elements into Array
if [ -n “$1” ]; then
filename = $1;
else
filename = `date –date=’1 hour ago’ “+%Y-%m-%d.%H”`;
fi
Compare numbers with -gt -lt -ne -eq
Compare strings with = !=
When using [[ ]]
if [[ ${domain} = “lalife.net” ]];then
echo “correct”
fi
([ ] needs the variable to be inside of “”)
Match
if [[ ${domain} =~ “lalife.net” ]];then
echo “correct”
fi
([ ] doesn’t work with =~)