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Bash - check for spaces

Posted on 2007-04-05
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Last Modified: 2013-12-26
Hello, how can i repeat an dialog until  there are no spaces in the word that is read from the dialog ?
example:

   dialog --title "EvoPanel - getmuh v1.5" \
          --inputbox "\nWrite the nickname\n" 13 50 "$jnickname"
   jnickname=`cat $tempfile`

while -nickname has spaces in it-; do something

so if i write "    blah" the while will turn on and ask me again, until i remove the spaces
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Question by:rares_dumitrescu
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4 Comments
 
LVL 84

Expert Comment

by:ozo
ID: 18857027
while echo $jnickname | grep ' '
0
 

Author Comment

by:rares_dumitrescu
ID: 18857182
while [ -z $jnickname ] || [ echo $jnickname | grep ' ' ]; do
cat /dev/null > $tempfile
   dialog --title "EvoPanel - getmuh v1.5" \
          --inputbox "\nError: You cannot have a null nickname.\n\
Please try again.\n" 12 50 "$jnickname"
   jnickname=`cat $tempfile`

done

but it does not say anything .. it forks if i type: aa aa
0
 

Author Comment

by:rares_dumitrescu
ID: 18858534
i was wrong, if i type aa aa it does not work, but if i tipe <space><space>aa it works, or aa<space><space>
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LVL 84

Accepted Solution

by:
ozo earned 2000 total points
ID: 18861019
echo "$jnickname" | grep ' '
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