Shell Programming and Scripting

apple orange juice
table chair cup

#!/bin/sh
program=$1
while read a b
do
if ["$a"="$program"]
then
echo a
fi
done<1.txt

 
echo "$a $b"

#!/bin/sh
 
program=$1
 
while read a b
do
   if [ "$a" = "$program" ]
   then
      echo "$a" "$b"
   fi
done < 1.txt

./match: line 5: [apple=apple]: command not found
./match: line 5: [table=apple]: command not found
./match: line 5: [home=apple]: command not found

$ cat x
#!/bin/sh

program="$1"

while read a b
do

  if [ "$a" = "$program" ]; then
    echo "$a $b"
  fi

done < 1.txt

exit 0
$ ./x apple
apple orange juice
$