sed 的变量替换

xyz3000

请教高手一个shell 的替换问题

cat c.txt
ssh hostname1 /home/grid/deconfig.sh

echo $a
myrac1

要将c.txt 文件中的hostname1替换成变量中的myrac1,总是不行.

sed  's/hostname1/'$a'/g' c.txt
/home/grid/deconfig.sh

sed  's/hostname1/$a/g' c.txt
ssh $a /home/grid/deconfig.s

谢谢.

jason680

回复 1# xyz3000

$ a=myrac1; echo ssh hostname1 /home/grid/deconfig.sh | sed 's/hostname1/'$a'/'
ssh myrac1 /home/grid/deconfig.sh

   

lovetrap

sed  "s/hostname1/$a/g" c.txt

shirocj

sed “s/xx/$yy/g” file  用双引号  单引号传不了参数

jcdiy0601

cat test
ssh hostname1 /home/grid/deconfig.sh
echo $a
myrac1
sed 's/hostname1/"$a"/' test
ssh "$a" /home/grid/deconfig.sh
sed 's/hostname1/'$a'/' test  
ssh myrac1 /home/grid/deconfig.sh