CODEWITHSUNDEEP
linuxshellsedsh
Sunil Kumar
Sunil Kumar

Reputation: 397

How can i use a variable inside sed cmd when Variable again has special character?

# test-1, this is okay, which deletes the given line in given 'cshrc' file

sed -i '\:alias reml rm -rf ${ENIP_HOME}/log/*:d' cshrc

# test-2, This does not delete the line in given 'cshrc' file

LINE="alias reml rm -rf ${ENIP_HOME}/log/*"
sed -i '\:$LINE:d' cshrc

Above sed cmd does not remove the line from 'cshrc; file, How i can perform line deletion in test-2 ?

Upvotes: 0

Views: 36

Answers (1)

C-Otto
C-Otto

Reputation: 5843

There's a difference between single quotes (') and double quotes (") when it comes to variable expansion. In your setting it suffices to just replace the double quotes by single quotes in the LINE= definition, so that ${ENIP_HOME} is carried over without being replaced (by the empty string, if the variable is not defined).

You also need to use double quotes in the sed line, so that $LINE is replaced by the definition of the variable.

Upvotes: 1

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