Linux – Using tee and Assigning to Variable

bashlinuxpipetee

I need to see output on the screen and at the same time grep the output and send grep result to variable. I think it can be done with tee but I can't figure out how exactly. I tried

mycommand | tee myvar=$(grep -c keyword)
mycommand | tee  >(myvar=$(grep -c keyword))

but this does not work. How should it be, preferrably without writting to files?

Best Answer

You would do this:

myvar=$( mycommand | tee /dev/tty | grep -c keyword )

Use tee to pipe the output directly to your terminal, while using stdout to parse the output and save that in a variable.

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Bash Scripting – How to Determine if a Bash Variable is Empty

This will return true if a variable is unset or set to the empty string ("").

if [ -z "${VAR}" ];

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How about something like this?

DOWNLOADED_ARTIFACT=$(downloadApplication "$WEB_GROUP" || echo "SomeErrorString")
if [ $DOWNLOADED_ARTIFACT == "SomeErrorString" ]; then
  exit 1
fi

That means "if downloadApplication is not successful, then echo SomeErrorString" (so your DOWNLOADED_ARTIFACT will be set to SomeErrorString. Then you can compare against that value.

Best Answer

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Bash Scripting – How to Determine if a Bash Variable is Empty

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