Programming :: Conditional Foreach Loop In Perl?
Jun 1, 2010#!/usr/bin/perl -w
use strict;
my @files = `ls -1`;
[code]...
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Programming :: Perl's Foreach Loop Can't Use An Array Element As The Control Variable?
Jul 22, 2011I'm reading "OReilly Learning Perl 5th Edition", and there are such words:Code:You can use an array element like $fred[2] in every place? where you could use any other scalavariable like $fred.At the bottom of the page, it explains the ? like this:Code:The most notable exception is that the control variable of a foreach loop, which you?ll see later in this chapter, must be a simple scalar.Since Perl has the save-and-restore mechanism for the control variable, why an array element can't be used as the control variable
View 1 Replies View RelatedProgramming :: Perl: How To Do A Foreach For Elements In A Database
Jul 15, 2009For Perl I need to understand a few things. It's unlikely that anyone will be able to give me direct answers but if they could point outI'm trying to hack down an existing script http://eoylpac.org/source/eoy.pl. What I need to be able to do (in a nut shell):1. Open a database2. Read the values for each uniq id and execute a subroutine for each of those values. (The subroutine already exists in the above file 'do_pdf').
View 5 Replies View RelatedProgramming :: Perl - Directories Given To Opendir Via Foreach Give "No Such File Or Directory" Error
Feb 19, 2009I'm writing a perl script to remove a test database and part of that is of course getting rid of all files. So I wrote this to do the job:
Code:
This always results in an "Could not open /u00/app/oracle/product/10.2.0/rdbms/dbs for reading: No such file or directory" (that directory is the one ending with the $spfile_dir variable) message, although that directory exists and the executing user has writing rights on it.
The same behaviour if I create the directory array like this:
Code:
The problem does not occur when one of the directories is the only element in the array though. Of course I could copy and paste that part of the script for the second directory, but I don't like that workaround.
Programming :: "For I In" Or "Foreach" Loop In C?
Nov 30, 2010I am learning C and know the use of the for (..) statement. But, when i was using BASH i could do:
Code:
for i in /path/to/somewhere/*.deb
do
[code]....
Programming :: Cannot Get Conditional Statements To Work In XDialog/Dialog
Feb 5, 2011 I cannot seem to get if else statements to work. if $choice == Dog then i want it to say "you selected Dog" The variable choice has the value Dog in it as proved at the end by echo "yes $choice is $choice" following the error Code: ./test.sh: 37: [$choice: not found How do i get the conditional statement to work? What's wrong here? This is the full script:
Code:
#! /bin/sh
: ${DIALOG=dialog}
: ${DIALOG_OK=0}
[code]....
Programming :: Bash Programming - Rename Files In A Loop?
Mar 31, 2011I need to rename the resulted searched files from a loopI have the following code:
find . -name DOC* | while read i
do
find $i -type f -name '*.txt'
done
basically, I am searching for all txt files inside any folder starting with DOC name.this code is working fine with me.I need to rename those .txt files to .txtOLDOS: Ubuntu 10.4Bash shell
Programming :: Broken Do While Loop?
Feb 9, 2011i can not figure out why my program does not terminate if i type n when i read loop unless it is the last if statement in my program ?
while [ "$loop" = y ] ; do
echo "what does baket mean: " ; read word
if [ "$word" = why ]
[code]....
Programming :: C++ Loop Windows ?
Oct 3, 2010Here is my code
Code:
I just cant seem to understand loops. i havent put the loop in yet but what i would like is the user only to have 3 tries at guessing number then exit if wrong or it says "correct if right" tbh i dont even know if the above code is correct. i have tried several ways and position of the loops but each time is comes out wrong
Programming :: Variable Is Gone At The End Of While Loop?
Mar 25, 2011I have a directory file capturing script, the variable is fine with in the loop but gone after the loop is done:
Code:
DIR="/usb/sdb1/media/music/"
i=1
[code]...
Programming :: Variable Name Change In A Loop?
Apr 24, 2010I am about to move my scripts to the next generation level, so I need some help I am stuck in varying my variable names in a loop. For example:
for user in ben dorothy mike pat
do
[ -r /home/$user ] && let "$user"check=1 || let "$user"check=0
[code]...
General :: Shell Programming Using While Loop
Jun 28, 2010I 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.
Programming :: C Language - For Loop That Just Keeps On Running?
Aug 1, 2010In 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].....
Programming :: Error Codes In A For Loop
Nov 3, 2010I'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?
View 14 Replies View RelatedProgramming :: Loop Through Records In A File?
Apr 23, 2011I 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.
Programming :: Read A File With A While Loop?
Apr 25, 2010ITT 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.
View 5 Replies View RelatedGeneral :: How To Use Foreach In Bash Shell
Mar 25, 2010I used c-shell previously in unix. One of the useful command I used frequently is foreach.> foreach a (`cat list`)>> echo $a need to use bash shell now instead, and realized that I can't use foreach anymore. The command is not found. Does anyone knows if there is similar command / function in bash shell?
View 9 Replies View RelatedProgramming :: Socket Programming In Module Perl
Jul 21, 2010Where is the perl module for programming with sockets?
View 4 Replies View RelatedSoftware :: Conditional Operator In C?
Feb 24, 2010if anyone knows plz explain this conditional operator timeout ? : MAX SCHEDULE_TIMEOUT
View 2 Replies View RelatedProgramming :: Can't Access To Content Of Array In For Loop
Mar 7, 2010When 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]
Programming :: Bash For Loop - All Responses On One Line
Nov 18, 2010I'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 $INKS
do
[Code].....
Programming :: Fortran How To Open A File In Loop
Jun 29, 2011I have a 50 file name NSSAVE0001.vtk to NSSAVE0050.vtk.Do I have to manually type individually command to open each file or can I have a loop to open file?
View 3 Replies View RelatedProgramming :: Take A List From A File And Use It In A For Loop In Python?
May 11, 2009so far I have this
list = open('list.txt')
for x in list:
list.read(x)
Programming :: Pass Arguments To A Function Using A Loop
Mar 1, 2010I need to pass a large number of arguments to a function which takes variable number of arguments, such as gtk_list_store_new. But it doesn't look nice if i write something like gtk_list_store_new(NUM,TYPE_A,TYPE_B,TYPE_C,...,TYPE_OMEGA); because of large number of arguments. And, it will be a trouble to change number of columns because of need to manually change arguments to large number of such functions. So, how can i pass all the arguments to a function using a loop? Something like
Code:
for(i=0;i<NUM;i++)
{
push_arg(args[i]);
}
call_function(func);
?
Of course, i could just use asm code for this, but is there a portable way of doing so?
P.S. i mean C language.
Programming :: Imagemagick With For Loop On The Commandline Does Not Work
May 26, 2011I have images in jpg format
Code:
CIMG0100.jpg
...
...
CIMG0131.jpg
I used imagemagick to convert the files to gif with the following command
Code:
for i in {100..131}; do convert CIMG0$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$i_scaled.gif; done # works not it seems the system is working for about half a minute, but I get no output. The single command
Code:
convert -scale 25% CIMG100.gif CIMG100_scaled.gif # works
works as expected and gives me a scaled image. What does the convert command do in the second case? is the for-loop wrong?
Programming :: Loop Produces Wierd Numbers
Aug 13, 2010I'm learning c but then when i tried looping as i follow a tutorial, the numbers are wierd that it seems not right..
This is the example.
Quote:
When i run it, it outputs this.
Quote:
why?
Programming :: Loop To Process Entries In A File?
Jul 9, 2010I hade created a file with following text entries.
content of fileitems.txt
kdeaccessibility-4.4.92
kdeadmin-4.4.92
kdeartwork-4.4.92
kdebase-4.4.92
How do I read the file one line at a time and so its ready to do something with that line.
Programming :: Unable To Execute FOR Loop In Shell?
Apr 19, 2011hint me why and how to execute the below for loop, the way i am trying to?
[bkcreddy17@local:~]$ cat -n test
1 date
2 ls -l
[code]...
Programming :: Comparison And Breaking Out Of Loop Java?
Oct 10, 2010my 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]...
Programming :: Progress Bar Instead Of Percentage Complete For Loop
Nov 25, 2010I'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.