Author Archives: yan

Find

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To delete empty directory

for d in `find /www/xxxx/oldfiles/* -type d -mtime +1| sort -r`;do echo $d;rmdir $d;done

requiretty

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Some cron didn’t work well after move to CentOS5

New to disable requiretty

May 19 10:40:01 xxx sudo:     root : sorry, you must have a tty to run sudo ; TTY=unknown ; PWD=/www/xxx/bin ; USER=xxx ; COMMAND=/bin/sh moviepagechmod.sh
vi /etc/sudoers
#Defaults    requiretty

Linux Command rpm

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delete rpm packages ignoring dependent error

#rpm -e –nodeps openssl-0.9.7a-33.17

list all files installed by a package
rpm -ql package_name

LVM

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Setup lvm

combine /dev/sdb and /dev/sdc

if there’s partition on /dev/sdb, /dev/sdc, need to clear them first using fdisk

fdisk /dev/sdb -> d (delete partition) ->w

fdisk /dev/sdc

pvcreate /dev/sdb

pvcreate /dev/sdc

vgcreate vgrp /dev/sdb /dev/sdc

vgchange -a y vg

vgdisplay vg|grep ‘Total PE’
lvcreate -i2 -I8 -l 70006 vg -n lv

vgdisplay vg|grep ‘Total PE

‘lvcreate -i2 -I8 -l 70006 vg -n lv

mkfs.ext3 /dev/vg/lv

tune2fs -r 128000 /dev/vg/lv

mount /dev/vg/lv /backup

Remove lvm

#lvremove /dev/vg/lv
#vgremove vg
#fdisk /dev/sdb
#mkfs.ext3 /dev/sdb1
#tune2fs -r 128000 /dev/sdb1
(do same to /dev/sdc)
#mount /dev/sdb1 /www

Logrotate

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Some logrotate  are not working properly

added “/var/log/xxx/*/errors” into /etc/logrotate.d/xxx
and change to weekly

/usr/local/zeus/web/log/errors /var/log/xxx/*/errors {
weekly
rotate 8
missingok
create 0644 nobody nobody
compress
}

problem in search

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problem when search for “V&R”
V%26amp%3BR
%26 -> &
%3B -> ;
%26amp%3B -> &

Solution: change & to encoded code in query sent to html
Add:
$srch_name=eregi_replace(“&”,”%26amp%3B”,$srch_name);
before the following code
if($srch_name !=”){ $req.=”&name=$srch_name”; }
if($srch_site !=”){ $req.=”&site=$srch_site”; }

Posted in PHP

Eat healthy

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31 Simple Ways to Prevent Cancer: Reduce Your Risk

Consider this number: 10 million. That’s how many cases of cancer are diagnosed worldwide each year. Now consider this number: 15 million. That’s how many cases of cancer the World health Organization estimates will be diagnosed in the year 2020 — a 50 percent increase — if we don’t get our act together.

Most cancers don’t develop overnight or out of nowhere. Cancer is largely predictable, the end result of a decades-long process, but just a few simple changes in your daily life can significantly reduce your risk. Here are 31 great tips. Continue reading →

missing ; before statement

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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(){ …..}

Posted in PHP

awk & Sed

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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