bash脚本中的SED Escape

Question

My tempfile.txt has below contents [Typical Cisco Configuration File]

interface GigabitEthernet1/11
 no ip address
 shutdown
 rmon collection stats 6010 owner monitor
!
interface GigabitEthernet1/12
 no ip address
 shutdown
 rmon collection stats 6011 owner monitor
!
interface GigabitEthernet1/13
 no ip address
 shutdown
 rmon collection stats 6012 owner monitor
!
interface GigabitEthernet1/14
 no ip address
 shutdown
 rmon collection stats 6013 owner monitor
!

I am trying to loop through to do some operation on each block Example

interface GigabitEthernet1/14 --> start of interface block
     no ip address
     shutdown
     rmon collection stats 6013 owner monitor
    ! --> end of interface block

I have another file which has below data intefaces.txt

interface GigabitEthernet1/11
interface GigabitEthernet1/12
interface GigabitEthernet1/13
interface GigabitEthernet1/14

Now want to do some changes in each block thats why I am trying to access block in loop via

while read line
do
sed -n '/$line/,/!/p' tempfile.txt # this should get me block
#code for doing some changes in block
done < interfaces.txt 

Now since my $line will be one of line of interfaces.txt eg: interface GigabitEthernet1/11

how can I escape / as I am doing in loop & my interfaces will always contain / character

Answer 1

通过在其前面加上反斜杠来告诉sed在搜索中代替/的字符：

sed -n "\@${line}@,/!/p" ...

Answer 2

To work with block of text, use gnu awk (due to multiple characters in RS)

awk -vRS="interface" '/1\/13/ {print RS $0}' file
interface GigabitEthernet1/13
 no ip address
 shutdown
 rmon collection stats 6012 owner monitor
!

Here you get all of info for interface 1/13

---

You can prevent the escaping of / by getting it in as a variable.

awk -vRS="interface" -vtest="1/13" '$0~test {print RS $0}'
interface GigabitEthernet1/13
 no ip address
 shutdown
 rmon collection stats 6012 owner monitor
!

Answer 3

In bash , you can use the parameter global replace operator, ${varname//old/new} , to replace the slashes with backslashed slashes, like this:

while read line; do
   sed -n "/${line//\//\/\/}/",'/!/p' tempfile.txt | # do stuff
done <interfaces.txt

... but Holy Leaning Toothpicks, Batman! I would go with @JonathanLeffler's solution of changing sed's search delimiter.