修改文件句柄：ulimit 系統設置腳本（避免設置不徹底而無效）

（一下腳本非本人所寫，從同事那裏得來，代他開源了^_^，請勿用作其他商業用途。僅供技術人員臨時查閱之用）

#!/bin/bash

TEXT="ulimit -HSn"
FILE="/etc/rc.d/ssh2"


# the default ulimit num is 10240
if [ "Z$1" = "Z" ] ; then
ULIMITNUM=10240
else
ULIMITNUM=$1
fi


# change /etc/profile
cp /etc/profile /etc/profile.bak
sed -i "/$TEXT/d" /etc/profile
echo "ulimit -HSn $ULIMITNUM" >> /etc/profile


# change /etc/security/limit.conf
cp /etc/security/limits.conf /etc/security/limits.conf.bak
sed -i "/^\* soft nofile/d" /etc/security/limits.conf
sed -i "/^\* hard nofile/d" /etc/security/limits.conf
echo "* hard nofile $ULIMITNUM" >> /etc/security/limits.conf
echo "* soft nofile $ULIMITNUM" >> /etc/security/limits.conf


# check the configure file of ssh2 is exist
if [ ! -e "$FILE" ];then
exit 1 
fi


# insert the new ulimit into configure file
sed -i "/$TEXT/d" $FILE
textnum=`cat $FILE |grep -n '/usr/local/sbin/sshd -f /etc/ssh2/sshd2_config.l' |awk -F':' '{print $1}'`
sed -i "${textnum}i ulimit -HSn $ULIMITNUM" $FILE 
if [ $? -ne 0 ];then
exit 2
fi


# rcssh2 restart
rcssh2 restart