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while loop from list

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# 1  
Old 09-13-2006
while loop from list
is it possible to run a while loop by comparing a variable with a list ?

taglist="<html> </html> <head> </head> <body> </body> <p> </p> <ul> </ul> <li> </li> <em> </em> <title> </title>"

read newtag

while [[ $newtag != $taglist ]]
do
echo "Entry is not in list, please try again'
read newtag

done


thanks
Steffen
# 2  
Old 09-13-2006
Code:
while [ `echo $taglist | grep -c "$newtag"` -ne 1 ]

# 3  
Old 09-13-2006
awesome, thanks.

Since I am new to this, would it be possible to explain what this command does step by step ?

thanks
Steffen
# 4  
Old 09-13-2006
echo $taglist | grep
# display value in a variable taglist and pass that value to grep command
# through pipe

echo $taglist | grep -c "$newtag"
# search for $newtag in $taglist and display its count
# -c option is for count of match of $newtag in $taglist

` ..commands.. `
# execute the commands and gives the return value of the last command
# that is executed. Here in our case we will get the return value of grep

finally we are checking whether count of $newtag in $taglist is not equal to one.
# 5  
Old 09-13-2006
one doubt
What if there are two matching tags? Wont the check fail??
# 6  
Old 09-13-2006
He didn't mention of reading two tags at a time. If that is the case then he has to change code accordingly.
# 7  
Old 09-13-2006
what change would that be ? I have multiple matching tags in another file ?

thanks,
Steffen
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