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Top Forums Shell Programming and Scripting Help in sed required.
# 1  
Old 08-06-2008
Help in sed required.
Hi All,
I am facing a small problem in sed. I want to insert a line in the existing file.

Existing code:
Code:
access to attr=userPassword
 by self write
 by * auth
 
access to *
 by self write
 by users read
 by anonymous auth

Desired code:
Code:
access to attr=userPassword
 by self write
 by * auth
 
access to *
        by self write
        by users read
        by peername.ip=127.0.0.1 read
        by anonymous auth

I put the existing code in var1 and desired code in var2 and used the following sed command, but somehow it's not working for me. Can there be a easier way to do this.

Code:
sed -i -e 's/$var1/$var2/g;' slapd_config

# 2  
Old 08-06-2008
Try this:

Code:
sed -i -e '/by users read/a\
        by peername.ip=127.0.0.1 read' slapd_config

# 3  
Old 08-06-2008
Thanks Annihilannic . this works for me. But I have two such instanes of the same text in the same file and I need to make changes only in the 2nd instance.

Is this possible by tweaking this a little bit.

Thanks!
nua7
# 4  
Old 08-06-2008
You could add something to skip up through "access to *" before making the substitution.

Code:
sed -e '1,/^access to \*/b' -e '/by users read/a\''by peername.ip=127.0.0.1 read' slapd_config

# 5  
Old 08-06-2008
Thanks era! But this is not working. I guess I need to find out this text first
Code:
access to attr=userPassword
 by self write
 by * auth

After that find out the statement "by users read" and insert this statement after it .

Code:
by peername.ip=127.0.0.1 read

So the new code would be ,

Code:
access to *
 by self write
 by users read
 by anonymous auth
....
....
some lines here...
 
 
access to attr=userPassword
 by self write
 by * auth
 
access to *
        by self write
        by users read
        by peername.ip=127.0.0.1 read
        by anonymous auth

Hope I have not confused.
# 6  
Old 08-06-2008
Hi,

check the following sed command

sed -n 's/${a}/${b}/g' file1
# 7  
Old 08-06-2008
I am sorry , but can you please explain this to me. I ran the command but it did not make any change.

I substituted a with var1 and b with var2 , which I had set, but that didn't work too.
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