Programming :: No While Loop Is AllowedThe Lecturer's Tip Was To Treat "-" As Negative And Not Hyphen?
Mar 25, 2010
I have a assignment relating to barcode reading.Let say i have to enter the 13 digit barcode with hyphen e.g "Enter barcode:123-46574-48847" using scanf.Once thats done how do i extract the values without the hyphene.g using printf "1234657448847". No arrays No strings and No function is allowed.No while loop is allowedThe lecturer's tip was to treat "-" as negative and not hyphen.
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Mar 4, 2010
I am having trouble with the code below, I'm trying to check if a variable holding a character is a hyphen.
Code:
#!/bin/bash
$char="-"
if (( "$char" == "-" )); then
[code]....
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Jul 19, 2011
I'm trying to create an array with variable including hyphenbut ksh refuses the first element
set -A allArgs
set +A allArgs ${allArgs[@]} -all
set +A allArgs ${allArgs[@]} -date
[code]...
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May 15, 2011
How can i get bc to subtract negative numbers?
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Oct 26, 2010
I need to convert an integer to a byte array of size 2 and vice versa. The code shown below works well for positive values but not for negative values. Also, using an array of size four makes the conversion works. However, I am limited to an array of size 2.
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Mar 9, 2011
I am trying to grep multiple numbers from file, grep does have the -f option for that.
Code: grep -f <`seq 500 520` /etc/passwd I know this could be done with
Code: for i in `seq 500 520`; do grep "$i" /etc/passwd; done But my question is fare more behind this example. It is possible to redirect one command output which will be treat as a content of file for another command ?
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Mar 31, 2011
I need to rename the resulted searched files from a loopI have the following code:
find . -name DOC* | while read i
do
find $i -type f -name '*.txt'
done
basically, I am searching for all txt files inside any folder starting with DOC name.this code is working fine with me.I need to rename those .txt files to .txtOLDOS: Ubuntu 10.4Bash shell
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Feb 9, 2011
i can not figure out why my program does not terminate if i type n when i read loop unless it is the last if statement in my program ?
while [ "$loop" = y ] ; do
echo "what does baket mean: " ; read word
if [ "$word" = why ]
[code]....
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Oct 3, 2010
Here is my code
Code:
I just cant seem to understand loops. i havent put the loop in yet but what i would like is the user only to have 3 tries at guessing number then exit if wrong or it says "correct if right" tbh i dont even know if the above code is correct. i have tried several ways and position of the loops but each time is comes out wrong
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Mar 25, 2011
I have a directory file capturing script, the variable is fine with in the loop but gone after the loop is done:
Code:
DIR="/usb/sdb1/media/music/"
i=1
[code]...
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Apr 24, 2010
I am about to move my scripts to the next generation level, so I need some help I am stuck in varying my variable names in a loop. For example:
for user in ben dorothy mike pat
do
[ -r /home/$user ] && let "$user"check=1 || let "$user"check=0
[code]...
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Jun 28, 2010
I am trying to do some shell programs. I tried some sites regarding the while loop, they give the structure as:
Code:
while [ n1 -lt 500 ]
do
echo $((n1+100))
done
But the below code also worked for me:
Code:
while ((n1 > 500))
do
echo $((n1+100))
done
By using (( )) I could use while, for. But the documentations didnt follow this way. I mainly use this for datastructure programming.
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Aug 1, 2010
In the code segment below is a for loop I am having some considerable difficulty with. It just keeps iterating endlessly and totally ignores the 70 times limit specified. I can't ever remember having this problem before and am absolutely Clueless.
Code:
for ( x = 0; x < 70; x++ )
{
fputs ("CSN00", target);
fprintf (target, "%d", userid);
[Code].....
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Nov 3, 2010
I've got a 'nested' for loop which has a grep in it, if the grep fails there's no output - however the error code is still $0 and the second for loop is still entered, there's also a grep in the second for loop.I guess ultimately what i need to know is whether there's a way of making grep generate an error code. when no results are found?
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Apr 23, 2011
I want to loop through the records in the below file (homedir.temp)
/home/user1
/home/user2
/home/user3
I want to do the following activities with each record1. du -s - to get the total usage for that directory (my variable name is SIZE)2. divide SIZE by du -c for /home to get the percentage of usage. (my variable name is PER)3. write the directory, SIZE, PER to a filePROBLEMI am using the below for loop: for record in homedir.tempthe mentioned activitiesdonehe above is not looping through the records. It does the first record perfectly and exits the loop.
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Apr 25, 2010
ITT and am just lurning about scripting and need to read a file and output the file to the screen. We need to do this with a while loop.
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Mar 7, 2010
When I deal with an array in a function I con not access to the content of array in a for loop, but out of a for loop I can access to them! for example
[code]...
In a function when I send as parameter, in a for loop it prints the content of array and out of a for loop it prints the address of arr[i]
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Nov 18, 2010
I'm writing a mass snmp toner check which polls any toners available to be snmp polled, however when using a loop statement I get the results on different lines; which sounds good, however the tool I use to check with (nagios) ignores the new lines.
Is there any way I can get the output on one line? Also, I need to raise a fault if any of the toners are below a specific level (with nagios you raise faults with the exit code) - any way I can do this without exiting the loop. Code below with bits and bobs commented out.
Code:
check_ink_levels ()
{
for ID in $INKS
do
[Code].....
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Jun 1, 2010
#!/usr/bin/perl -w
use strict;
my @files = `ls -1`;
[code]...
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Jun 29, 2011
I have a 50 file name NSSAVE0001.vtk to NSSAVE0050.vtk.Do I have to manually type individually command to open each file or can I have a loop to open file?
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May 11, 2009
so far I have this
list = open('list.txt')
for x in list:
list.read(x)
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Mar 1, 2010
I need to pass a large number of arguments to a function which takes variable number of arguments, such as gtk_list_store_new. But it doesn't look nice if i write something like gtk_list_store_new(NUM,TYPE_A,TYPE_B,TYPE_C,...,TYPE_OMEGA); because of large number of arguments. And, it will be a trouble to change number of columns because of need to manually change arguments to large number of such functions. So, how can i pass all the arguments to a function using a loop? Something like
Code:
for(i=0;i<NUM;i++)
{
push_arg(args[i]);
}
call_function(func);
?
Of course, i could just use asm code for this, but is there a portable way of doing so?
P.S. i mean C language.
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May 26, 2011
I have images in jpg format
Code:
CIMG0100.jpg
...
...
CIMG0131.jpg
I used imagemagick to convert the files to gif with the following command
Code:
for i in {100..131}; do convert CIMG0$i.jpg CIMG0$i.gif; done # works
This worked like expected, but when afterwards I wanted to scale the images
Code:
for i in {100..131}; do convert -scale 25% CIMG00$i.gif CIMG00$i_scaled.gif; done # works not it seems the system is working for about half a minute, but I get no output. The single command
Code:
convert -scale 25% CIMG100.gif CIMG100_scaled.gif # works
works as expected and gives me a scaled image. What does the convert command do in the second case? is the for-loop wrong?
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Aug 13, 2010
I'm learning c but then when i tried looping as i follow a tutorial, the numbers are wierd that it seems not right..
This is the example.
Quote:
When i run it, it outputs this.
Quote:
why?
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Jul 9, 2010
I hade created a file with following text entries.
content of fileitems.txt
kdeaccessibility-4.4.92
kdeadmin-4.4.92
kdeartwork-4.4.92
kdebase-4.4.92
How do I read the file one line at a time and so its ready to do something with that line.
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Apr 19, 2011
hint me why and how to execute the below for loop, the way i am trying to?
[bkcreddy17@local:~]$ cat -n test
1 date
2 ls -l
[code]...
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Oct 10, 2010
my issue is that the when i put in the correct input its going into the loop like i put in incorrect input and wont break out of the loop even with the correct input entered
Code:
import java.util.*;
import javax.swing.*;
[code]...
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Nov 25, 2010
I've got a loop which is able to echo out how complete a process is after each loop (e.g says 25% if the loop has 4 elements and has run once through). Is there any way I can print characters, perhaps a progress bar? I was thinking of using the percentage as a count or something and using.
Code:
I got told off for including code from work here.
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Jun 7, 2010
The script that Iam trying to write is running a for loop and reading line by line from a text file. inside this for loop i would like to execute update SQL statement .
a pesudo code is
Quote:
`$ISQL -U $username -P $Password -D $Dbname -I $INTERFACE <<QRY
for id in $idlist #idlist iam reading from a file
[code]...
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Jan 1, 2011
I have a file like below:
PU12829,24869;PD15733,24869;PD15733,19785;PD12829,19785;PD12829,24869;
PU4599,20915;PD9924,20915;PD9924,18898;PD4599,18898;PD4599,20915;
PU12829,24869;PD15733,24869;PD15733,19785;PD12829,19785;PD12829,24869;
PU4599,20915;PD9924,20915;PD9924,18898;PD4599,18898;PD4599,20915;
PU1723,3423; #this line is ignored to short
[Code]...
What I'm trying to do is while true, cut each line from file that begins with PU and thats longer than 12 characters and write to a increasing numbered file for each line. Stating with object1 etc.
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