CODEWITHSUNDEEP
bash
David
David

Reputation: 31

Set variable in Bash script to contents of file plus some text after

How do I set a Bash variable in a shell script in redhat Linux to the contents of a file, which is only one line, and then add some text after it.

For example:

echo "Version 1.2.3.4" > $TMPDIR/devver
env=dev
export ${env}_result="`cat $TMPDIR/${env}ver` (No response - version is from cache)"
echo $dev_result

I want the output to be:

Version 1.2.3.4  (No response - version is from cache)

Instead, I get a newline after the version, like this:

Version 1.2.3.4
(No response - version is from cache)

Upvotes: 3

Views: 1664

Answers (3)

glenn jackman
glenn jackman

Reputation: 247042

Use a bash builtin:

export ${env}_result="$(< $TMPDIR/${env}ver) (No response - version is from cache)"
echo "$dev_result"

Documented here: "The command substitution $(cat file) can be replaced by the equivalent but faster $(< file)."

Upvotes: 2

Luigi
Luigi

Reputation: 8847

the utility tr may help:

echo "Version 1.2.3.4" | tr '\n' ' '> $TMPDIR/devver
env=dev
export ${env}_result="`cat $TMPDIR/${env}ver` (No response - version is from cache)"
echo $dev_result

tested :) it works.

Upvotes: 1

DrC
DrC

Reputation: 7698

Your problem isn't in the variable setting it is in the file creation. echo appends a newline to the file contents. So use

echo -n "Version..."

and things should work.

Upvotes: 3

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