You are using a loop that is never exited, no matter what the input.
Also, there is a difference between a string comparison and a numerical comparison.
A case statement can only match patterns. Like @jgt mentioned, in that syntax a pattern like [50-59] will match a single character, in this case when it is 5, 0-5 or 9.
The [ ... ] syntax does not allows for the use of || within the brackets.
You would need to use
For numerical comparisons keywords like -eq, -lt, -le and such are used (see man test)
--
Note: Be careful with spaces < = is not the same as <=
Last edited by Scrutinizer; 04-16-2018 at 12:03 AM..
This User Gave Thanks to Scrutinizer For This Post:
Hello guys..
well, im kinda newbie with unix because i started to learn it like 2 weeks ago.
then i started to make some exercises, but i got stucked on this one :
so, i need to know how many different 'names' has the 5th field and how many times each name appears.
i was trying with a... (6 Replies)
Hello guys.
Well, on this exercise i need the average "chargeAmount" per hour (for each hour).
with this code :
cat getusagesummarywrongmatch | grep -iv MOU2GRTObject | cut -d'|' -f4,14 | grep -i chargeamount | cut -d' ' -f2
http://img227.imageshack.us/img227/5889/65969235do0.jpg
i got... (2 Replies)
How do I write a shell script file to read 5 student names (First and Last name) and their grades using a While Loop? Find the Average, Maximum, and Minimum of grades using the same While Loop. Prompt the user using tput to enter the information (first name, last name, grade). Save the data in a... (1 Reply)
Hi, 'm trying to do an exercicise, and one part is:
ls -l $1 | awk '
BEGIN {
max = $5;
}
{
if ($5 > max){
max = $5;
}
}
END {
print "Tamanio mayor fichero = " max; }'
# Imprimimos ahora el menor tamaņo de fichero
ls -l $1 | awk '... (4 Replies)
you are to write a program which will read in a tax rate (as a percentage) and the prices of 5 items. the program is to calculate the total price, before tax, of the items and then the tax payable on those items, and then the total amount due. the tax payable is computed by appliying the tax rate... (1 Reply)
hello everyone!:)
I have an exercise which I think is difficult for beginner like me. Here is the exercise
Create a shell script, which takes a directory as command line argument.
Script displays ten first lines from every text file in that directory. After
displaying the lines from the... (1 Reply)
Hi,
I am learning unix. I want to practice few small excercises. Please suggest me some goor URL to practice.
Thanks in advance. (1 Reply)
Discussion started by: stew
1 Replies
LEARN ABOUT DEBIAN
z88dk-copt
copt(1) z88 Development Kit copt(1)NAME
copt - peephole optimizer
SYSNOPIS
copt file ...
DESCRIPTION
copt is a general-purpose peephole optimizer. It reads code from its standard input and writes an improved version to its standard output.
copy reads the named files for its optimizations, which are encoded as follows:
<pattern for input line 1>
<pattern for input line 2>
...
<pattern for input line n>
=
<pattern for output line 1>
<pattern for output line 2>
...
<pattern for output line m>
<blank line>
Pattern matching uses literal string comparison, with one exception: ``%%'' matches the ``%'' character, and ``%'' followed by a digit
matches everything up to the next occurrence of the next pattern character, though all occurrences of %n must denote the same string. For
example, the pattern ``%1=%1.'' matches exactly those strings that begin with a string X, followed by a ``='' (the first), followed by a
second occurrence of X, followed by a period. In this way, the input/output pattern
mov $%1,r%2
mov *r%2,r%2
=
mov %1,r%2
commands copt to replace runs like
mov $_a,r3
mov *r3,r3
with
mov _a,r3
Note that a tab or newline can terminate a %n variable.
copt compares each run of input patterns with the current input instruction and its predecessors. If no match is found, it advances to the
next input instruction and tries again. Otherwise, it replaces the input instructions with the corresponding output patterns, pattern vari-
ables instantiated,and resumes its search with the first instruction of the replacement. copt matches input patterns in reverse order to
cascade optimizations without backing up.
BUGS
Errors in optimization files are always possible.
SEE ALSO z88dk(1), z88dk-zcc(1), z88dk-z80asm(1), z88dk-appmake(1), z88dk-copt(1).
AUTHOR
z88dk was written by Dominic Morris <dom@z88dk.org>, and others.
01 December 2009 copt(1)