shell---practice2
#!/bin/bash#File: for_dir.sh
#Date: 2016-01-12
changeFile="/tmp/mypasswd" //定义changFile变量的值
if [ ! -f $changeFile ]; then //判断changFile是否存在
touch $changeFile
else
echo "The $changeFile is exist."
fi
#if [ ! -x $changeFile ]; then //此if语句为赋予权限，可以省略
# chmod +x $changeFile
#else
# echo "The $changeFile with executable permissons."
#fi
file="/etc/passwd" //定义file变量的值
for i in 2 4 6 10 13 15 //将i做for循环，依次赋值2 4 6 10 13 15
do
line=`sed -n "$i"p $file` //取出对应的行，并赋值给变量line
echo "$line"
echo "$line" >> /tmp/mypasswd
done
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[1]