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sed with bash variables

I am trying to run sed from a bash script to replace a value in a string with a bash variable.
Essentially,

Code:

MYVAR="cabbage"

sed -e 's/lettus/$MYVAR/'

But this dosn't work (presumably because the sed command is contained in apostrophies so the variables is not translated) all lettuses get replaced by "$MYVAR" rather than "cabbage"

Can anyone suggest how I can get this to work?

Hi,

From within a (bash) script you need to use double quotes instead of singel qoutes to expand the variable. I.e:

Code:

MYVAR="cabbage"

sed -e "s/lettus/$MYVAR/"

Hope this helps.

Re: sed with bash variables

Quote:

Originally posted by MurrayL
I am trying to run sed from a bash script to replace a value in a string with a bash variable.
Essentially,

Code:

MYVAR="cabbage" sed -e 's/lettus/$MYVAR/'

But this dosn't work (presumably because the sed command is contained in apostrophies so the variables is not translated) all lettuses get replaced by "$MYVAR" rather than "cabbage"

Can anyone suggest how I can get this to work?

just complementing druuna information, you can also single-quote the variable :

Code:

sed -e 's/lettus/'$MYVAR'/'

should work also.

regards

slackie1000