sed command to replace a line at a specific line number with some other line


 
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# 1  
Old 04-23-2013
sed command to replace a line at a specific line number with some other line

my requirement is,

consider a file output

Code:
cat output
 
blah sdjfhjkd jsdfhjksdh
sdfs 23423 sdfsdf sdf"sdfsdf"sdfsdf"""""dsf
 hellow there 
this doesnt look good
et cetc etc
etcetera


i want to replace a line of line number 4 ("this doesnt look good") with some other line


say echo "me there $chco" (with the echo command)

the below is not doing the job... i dont watnt to replace a string. All i need is it should delete line 4 and replace my whole sentence in that line

Code:
 
 sed -i '4 s|*|echo \"me there \$ech\" |'  output

PS: i dont want to perform any file redirection either
any help is appreciated thanks
# 2  
Old 04-23-2013
With awk
Code:
awk 'NR==4 {$0="me there $chco"} 1' file
blah sdjfhjkd jsdfhjksdh
sdfs 23423 sdfsdf sdf"sdfsdf"sdfsdf"""""dsf
 hellow there
me there $chco
et cetc etc
etcetera

This User Gave Thanks to Jotne For This Post:
# 3  
Old 04-23-2013
Code:
$ sed '4 c \"me there \$ech\"' output
blah sdjfhjkd jsdfhjksdh
sdfs 23423 sdfsdf sdf"sdfsdf"sdfsdf"""""dsf
 hellow there
"me there $ech"
et cetc etc
etcetera

Code:
$ sed '4 s/.*/\"me there \$ech\"/' output
blah sdjfhjkd jsdfhjksdh
sdfs 23423 sdfsdf sdf"sdfsdf"sdfsdf"""""dsf
 hellow there
"me there $ech"
et cetc etc
etcetera

You can add the -i flag. Smilie
This User Gave Thanks to hanson44 For This Post:
# 4  
Old 04-23-2013
thanks guys.. works good :-)
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