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Old 10-25-2007, 12:35 PM   #1
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Post using sed to replace text on one line in a text file

the end result of what I am trying to get is :::
sed '243s/something/somethingelse/' -i hamlog.txt

this works from the console but tryign to get a bash script working
where by the 243 is entered by a user as well as something and somethngelse
that being $id $whattochange and $changeto

what I have tried so far is...seperated by dashes:::

sed '$(echo $id)s/$(echo $whattochange)/$(echo $changeto)/' -i $logfile
cat $logfile | sed $id's/"$whattochange"/"$changeto"/g' > test.txt
mv test.txt $logfile
cat $logfile | sed '$(echo $id)s/$(echo $whattochange)/$(echo $changeto)/g' > test.txt
sed '$(echo "$id/s/$whattochange/$changeto/")' -i $logfile
xx="`echo -e "$id \bs"`"
sed '$xx/$whattochange/$changeto/' -i $logfile

nothing seems to work, it works perfectly from the command line so I know I cant be quoting or something properly but I just cant seem to hit the nail on the head so to speak

been a week trying to research and learn what I am doing wrong but only ending up in a dead end. Was hopign to learn but doing it the hard way but alas teeth has been grinded hair has been pulled tiem to ask the "uber" geeks for help

many thanks
vo1pwf - geek in training -
Old 10-25-2007, 01:13 PM   #2
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And welcome to LQ!

What happens if you replace the ' with " in
sed '$(echo $id)s/$(echo $whattochange)/$(echo $changeto)/' -i $logfile

Old 10-25-2007, 01:22 PM   #3
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No need for "echo", the following should work fine:
sed "$id s/$whattochange/$changeto/" -i $logfile
Have a look at this.
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Old 10-25-2007, 07:50 PM   #4
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Smile thanks

thank you thank you thank you thank you thank you thank you thank you thank you thank you thank you thank you thank you thank you thank you

I knew it had to be somethign asoo stupid and simple

the sed "$id s/$whattochange/$changeto/" -i $logfile

worked like a charm

when I used ' it complaint about spaceing tried to do a echo -e \b to remove spacing and still didnt work..... a weeks frustration solved....thank you soooOOOOOOOOoooOOOoooOO much

eventually like to learn more and give back to the community like you just did but until then so continues the learning curve
Old 06-24-2009, 08:46 AM   #5
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Hi All,

I'm Using This Command :

sed -e -i "s/${Rule}/${NewRule}/g" excludefile.conf

And it's working fine with me, but sometimes any of my variables contains this character "/" and this causes trouble executing the command, could anyone help skipping this issue ?

thanks in advance.
Old 06-24-2009, 08:54 AM   #6
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Please, don't resurrect old threads, unrelated to your question. Start your own and you will get a faster response.

You can use any other character as separator. The rule is: the first character after the 's' command is the separator, e.g.
sed -e -i "s%${Rule}%${NewRule}%g" excludefile.conf
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