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Homework and Emergencies Homework & Coursework Questions Alphabetical help.
# 8  
Old 08-19-2011
ok, from the post, i see you are using cygwin. I am not aware of this cygwin

P.S. I am using cygwin in windows to do this script
# 9  
Old 08-19-2011
cygwin is a unix environment that mimics bash in windows and various other stuff for unix.
# 10  
Old 08-19-2011
from the error, i can suggest you to use one [

Code:
 
while [[ $letter == "Z" ] || [ $letter < "Z" ] && [ $letter -ne 0 ]]; do

# 11  
Old 08-19-2011
Now i get the error
Code:
./Assignment4.SH: line 49: syntax error in conditional expression
./Assignment4.SH: line 49: syntax error near `]'
./Assignment4.SH: line 49: `    while [[ $letter == "Z" ] || [ $letter \< "Z" ]
&& [ $letter -ne 0 ]]; do'


should i add a space between those brackets?
# 12  
Old 08-19-2011
It was typo. Use only one bracket:
Code:
while [ $letter == "Z" ] || [ $letter \< "Z" ] && [ $letter -ne 0 ]; do

But I'm afraid you can get other issues. Try this and give us the full script you wrote.
Better so:
Code:
[ "$letter" = Z ] || [ "$letter" \< Z ] && [ "$letter" != 0 ]

Last edited by yazu; 08-19-2011 at 08:43 AM.. Reason: better (changed == to =, -ne to !=, add and remove quotes)
# 13  
Old 08-19-2011
Quote:
Originally Posted by itkamaraj
from the error, i can suggest you to use one [

Code:
 
while [[ $letter == "Z" ] || [ $letter < "Z" ] && [ $letter -ne 0 ]]; do

This condition will not work. $letter < "Z" . How can we use numeric comparisons with Alphabets.?

Pls let us know your exact requirement..
# 14  
Old 08-19-2011
Ok. You may be wondering what the difference between "[[" and "[". There is a lot of UNIX shells really and there is a standard - POSIX. "[[" is a nice construction and it removes some shell quirks but it's not in POSIX standard - it's bash extension.
So the question is - what requirements does your shell need to match? Could you write your script in bash or you need to use POSIX?
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