Problem comparing between variable in unix-CodePudding

I have a problem where i compare the first line of the file to a paremeter i send, how can i fix it?

./lab12.sh lyrics "Yesterday"

if [[ "$1" == "lyrics" ]]
then
for file in /tmp/beatles/*.txt ; do
          if [[ head -1 $file == "$2" ]] //problem here !
          then
          echo cat | tail  3 $file
          fi
          done 
          fi
echo "Error - Song name not found"
fi

CodePudding user response：

At the "problem line" you cited, you are looking for command substitution, thereby allowing the output of the command to replace the command itself.

Your line should read:

if [[ $(head -1 "$file") == "$2" ]]