CODEWITHSUNDEEP
bashsed
punksta
punksta

Reputation: 2818

bash auto escaping of non-alphanumeric symbols

I have bash script for teamcity.It puts build variables value to file using placeholders.

sed -i ""
-e "s/BUNDLE_VERSION/%bundle_version%/"
-e "s/BUNDLE_ID/%bundle_id%/"
-e "s/APP_TITLE/%title%/" "%system.teamcity.build.tempDir%/info.plist"

%var% - replaced to value of var before run bash script by teamcity.

It doesn't work with variables which have ', ", / and probably other non-alphanumeric symbols. For example with title = Auto Shop "SuperCar" it crashes

[12:22:07]sed: 1: ""s/APP_TITLE/Auto ...": invalid command code "

How to fix script to work with non-alphanumeric symbols?

Upvotes: 1

Views: 233

Answers (1)

riteshtch
riteshtch

Reputation: 8769

Before passing it to sed escape the special/meta characters like this: 

BUNDLE_VERSION=$(echo "$BUNDLE_VERSION" | sed -r 's/\\/\\\\/g;s/\//\\\//g;s/\^/\\^/g;s/\[/\\[/g;s/'\''/'\'"\\\\"\'\''/g;s/\]/\\]/g;s/\*/\\*/g;s/\$/\\$/g;s/\./\\./g')

Example: 

$ echo "^[a/b'c\d]*$." | sed -r 's/\\/\\\\/g;s/\//\\\//g;s/\^/\\^/g;s/\[/\\[/g;s/'\''/'\'"\\\\"\'\''/g;s/\]/\\]/g;s/\*/\\*/g;s/\$/\\$/g;s/\./\\./g'
\^\[a\/b'\''c\\d\]\*\$\.

and use single quotes while putting in variables for the main expression. Its better to use some other tool for passing variables like awk's -v option.

Upvotes: 1

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