标签：code pts sql actor for div factor else dog
IFS:
对IFS的用处直接进行说明，详细IFS是干什么的...自行谷歌
首先创建一个 "a a"，和"a"的文件:
然后我们 ls查看一下：
--> ls a a a是这种。
然后假如我们须要写脚本操作每个文件：
--> for i in $(ls); do echo "$i" ;done a a a可是结果确实这种，显然与我们的要求不符
由于IFS的值是空格，制表符。回车。所以这里把a a变成了2个a
可是我们改动了IFS以后例如以下：
--> OldIfs=$IFS;IFS=$‘\n‘;for i in $(ls); do echo "$i" ;done ;IFS=$OldIfs a a a嗯，这样就达到了我们的目的，这个时候是以‘\n‘为切割符
数组：
一个脚本进行说明：
#!/bin/bash
# *-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*
# > Author: xiaojunyu/LunaW
# > Mail : xiaojunyu5201314@163.com
# > Gmail : lunaw.org@gmail.com
# > Blog : http://blog.csdn.net/lunaw
# > Web : http://lunaw.org http://lunaw.net
# *-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*
# DEPENDS:=+libsqlite3 +libcurl +libpthread +libc
# 默认选择的包
SelectPackages=(
"sed"
"gawk"
"grep"
"bc"
"luci-lib-json"
"iperf"
"tc"
"restorefactory"
"xinetd"
"n2n"
)
# 默认不选择的包 优先级强于选择的包
UnSelectPackages=(
"horst"
"vim-full"
"vim-runtime"
"qos-scripts"
"wifidog"
"libcurl"
"curl"
"tc"
"sqlite3-cli"
"libsqlite3"
)
if [[ -f .config ]]; then
for Name in `seq 1 ${#SelectPackages[*]}`
do
PackageName="CONFIG_PACKAGE_${SelectPackages[$(expr $Name - 1)]}"
if [[ `cat .config| grep "${PackageName}=y"| wc -l` == 0 ]]; then
echo -e "\e[01;31mNot Found (${PackageName}=y) "
if [[ `cat .config| grep "# ${PackageName} is not set"| wc -l` == 1 ]]; then
echo -e "\e[01;33mFound (# ${PackageName} is not set) "
sed -i "s/# ${PackageName} is not set/${PackageName}=y/g" .config
echo -e "\e[01;36mReplace (${PackageName}=y) done!"
else
echo -e "\e[01;31mNot Found (# ${PackageName} is not set) "
echo "${PackageName}=y" >> .config
echo -e "\e[01;36mAdd (${PackageName}=y) done!"
fi
else
echo -e "\e[01;33mFound (${PackageName}=y) "
fi
done
echo "--------------------------------------"
for Name in `seq 1 ${#UnSelectPackages[*]}`
do
PackageName="CONFIG_PACKAGE_${UnSelectPackages[$(expr $Name - 1)]}"
if [[ `cat .config| grep "# ${PackageName} is not set"| wc -l` == 0 ]]; then
echo -e "\e[01;31mNot Found (# ${PackageName} is not set) "
if [[ `cat .config| grep "${PackageName}=y"| wc -l` == 1 ]]; then
echo -e "\e[01;33mFound (${PackageName}=y) "
sed -i "s/${PackageName}=y/# ${PackageName} is not set/g" .config
echo -e "\e[01;36mReplace (# ${PackageName} is not set) done!"
else
echo -e "\e[01;31mNot Found (${PackageName}=y) "
echo "# ${PackageName} is not set" >> .config
echo -e "\e[01;36mAdd (# ${PackageName} is not set) done!"
fi
else
echo -e "\e[01;33mFound (# ${PackageName} is not set) "
fi
done
else
echo -e "\e[01;31mNot Found .config"
fi
echo -e "\e[01;00m+---------------------------------+"
echo -e "\e[01;00m| 不用操心，这仅仅是选择了几个包! |"
echo -e "\e[01;00m+---------------------------------+"
sleep 1
替换：
单一替换
--> XiaoName="xiaojunyu"; echo "${XiaoName/x/j}"
jiaojunyu所有替换--> XiaoName="xiaojunyu"; echo "${XiaoName//u/a}"
xiaojanya
删除
--> XiaoName="xiaojunyu"; echo "${XiaoName//u/}"
xiaojny有几种方法。第一种：
XiaoCh="xiao;jun;yu"
for i in ${XiaoCh//;/ }
do
echo "$i"
done 输出：xiao jun yu可是假如是这种话：
XiaoCh="xiao;j un;yu"
for i in ${XiaoCh//;/ }
do
echo "$i"
done 输出：
xiao j un yu并非我们预料的那样。然后另外一种切割方法
IFS法：
XiaoCh="xiao;j un;yu"
OldIFS=$IFS
IFS=$‘;‘
XiaoArr=($XiaoCh)
for i in ${XiaoArr[@]}
do
echo "$i"
done
IFS=$OldIFS输出：xiao j un yu
查找：
查找一个字符串是否包括还有一个字符串
--> XiaoA="abc"; XiaoB="a"; [[ "${XiaoA/${XiaoB}/}" == "$XiaoA" ]] && echo "No" || echo "Yes"
Yes
--> XiaoA="abc"; XiaoB="w"; [[ "${XiaoA/${XiaoB}/}" == "$XiaoA" ]] && echo "No" || echo "Yes"
No
对Shell几个冷知识的总结(IFS,数组,替换,分割,查找)
标签：code pts sql actor for div factor else dog
原文地址：http://www.cnblogs.com/lxjshuju/p/7040056.html
