shell编程有关的小总

#!/bin/sh
 
myPath="/var/log/httpd/"
myFile="/var /log/httpd/access.log"
 
#这里的-x 参数判断$myPath是否存在并且是否具有可执行权限
if [ ! -x "$myPath"]; then
    mkdir "$myPath"
fi
 
#这里的-d 参数判断$myPath是否存在
if [ ! -d "$myPath"]; then
    mkdir "$myPath"
fi
 
 
#这里的-f参数判断$myFile是否存在
if [ ! -f "$myFile" ]; then
    touch "$myFile"
fi
 
#其他参数还有-n,-n是判断一个变量是否是否有值
if [ ! -n "$myVar" ]; then
    echo "$myVar is empty"
    exit 0
fi
 
#两个变量判断是否相等
if [ "$var1" = "$var2" ]; then
    echo '$var1 eq $var2'
else
    echo '$var1 not eq $var2'
fi

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#!/bin/sh
for filename in `ls`;
do

done

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grep -r mysql /etc/ld.so.conf > /dev/null
if [ ! $? == 0 ] ;then
fi

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read -p "Please enter your Hostname: " host_name
hostname $host_name

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grep -r mysql /etc/group > /dev/null

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read -p "Please enter your Domain: " domain
sed s/test.com/$domain/g /etc/postfix/main.cf

 

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read -p "Please enter your Username: " user
read -s -p "Please enter your Password: " pass

realpass=$(awk "/${user}/ {print \$2}" /etc/secrets)

if [ "$pass" == "$realpass" ]; then
 # what you want to do  i.e. change pass
else
 echo "error"
fi