shell问题汇总

$ cat demo.sh 
echo $var1 
$ var1=a1
$ export var1                       # export 变量 
$ sudo echo $var1                   # sudo执行echo命令，返回变量值 
>>>a1
$ sudo bash demo.sh                # sudo执行脚本，不能获取变量值 
 
$ bash demo.sh                     # 普通用户执行脚本，返回变量值 
>>>a1

# 解决方案
$ sudo -E bash demo.sh　　# sudo 带-E参数，可以获取变量值
>>>a1

$ BRANCH_NAME=feature/ss_tracking

$ echo $BRANCH_NAME

>>>feature/ss_tracking

$ echo ${BRANCH_NAME/\//-}

>>>feature-ss_tracking

#linux
find features -type f |while read file;do sed -i ‘s/context.feature.mongo/context.mongo/g‘ $file;done

#mac
find features -type f |while read file;do sed -i "" ‘s/context.feature.mongo/context.mongo/g‘ $file;done