Using sed to replace two different strings?


 
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# 1  
Old 11-10-2010
Using sed to replace two different strings?

Hey everyone!
Simple question - I am trying to use sed to replace two different strings. As it stands I can implement this as:
sed -i 's/TIMEOUT//g'
sed -i 's/null//g'

And it works. However, is it possible to shrink that down into a single command? Will there be any performance benefits?
# 2  
Old 11-10-2010
Code:
sed -i 's/TIMEOUT//g;s/null//g'

# 3  
Old 11-10-2010
Yes, there will be the performance benefits of not needing to run sed twice and not needing to read the entire file twice.

You can stick them on the end with ; i.e. s/a/b/g;s/c/d/g
# 4  
Old 11-10-2010
Watch out about this :

Code:
[ctsgnb@shell ~]$ echo '|||' | sed 's/||/|,|/g'   <----- in spite of the global replacement flag, it cannot handle 2 substitution in this odd series of pipe !
|,||
[ctsgnb@shell ~]$ echo '||||' | sed 's/||/|,|/g'
|,||,|
[ctsgnb@shell ~]$ echo '|||' | sed 's/||/|,|/g;s/||/|,|/g'
|,|,|
[ctsgnb@shell ~]$ echo '||||' | sed 's/||/|,|/g;s/||/|,|/g'
|,|,|,|
[ctsgnb@shell ~]$ uname -a
FreeBSD <anonymized> 8.1-RELEASE FreeBSD 8.1-RELEASE #0: Sun Jul 25 16:41:25 MDT 2010     <anonymized>  amd64
[ctsgnb@shell ~]$

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