How to change the directory location of the screenshots in Mac OSX Snow Leopard.

I use Macbook with MacOSX Leopard, after I upgrade to Snow Leopard, short keys to take screenshots doesn’t make any output file. After searching in google, it is advisable to change the directory location for the screenshot. Here’s how I do. Do these commands using an ordinary user (without admin rights).

$ defaults write location ~ / Desktop /
$ killall SystemUIServer

Then please try again to capture the screen. To capture the entire screen display use Cmd-Shift-3, if you want to just capture some of the screen you can use Cmd-Shift-4.

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Tips to delete sessions file of php in CentOS 5.5

Different from Ubuntu, in CentOS 5.5, I do not find a mechanism to delete files from the php session. Because I’m worried the sessions file is not deleted, I import the fileremoval mechanism of Ubuntu.

I copy the following files from Ubuntu.

$cat /usr/lib64/php/maxlifetime

#!/bin/sh -e
for ini in /etc/php.ini; do
cur=$(sed -n -e ‘s/^[[:space:]]*session.gc_maxlifetime[[:space:]]*=[[:space:]]*\([0-9]\+\).*$/\1/p’ $ini 2>/dev/null || true);
[ -z “$cur” ] && cur=0
[ “$cur” -gt “$max” ] && max=$cur
echo $(($max/60))
exit 0

Then we create cron file to auto delete the sessions files.

$cat /etc/cron.d/php

# /etc/cron.d/php5: crontab fragment for php5
# This purges session files older than X, where X is defined in seconds
# as the largest value of session.gc_maxlifetime from all your php.ini
# files, or 24 minutes if not defined. See /usr/lib/php5/maxlifetime
# Look for and purge old sessions every 30 minutes
09,39 * * * * root [ -x /usr/lib64/php/maxlifetime ] && [ -d /var/lib/php/session ] && find /var/lib/php/session -depth -mindepth 1 -maxdepth 1 -type f -cmin +$(/usr/lib64/php/maxlifetime) -delete

That’s it.

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