Programming :: Bash Script: Catch File Not Found Error And Send To /dev/null

Apr 21, 2010

I have the following working script. It checks the directory for txt files, if files are there, it copies to another directory or gives error. I would like to exclude "file not found" errors and send them to /dev/null. All other errors should go to the email address as usual.


function err
if [[ $? -ne 0 ]]


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Programming :: Catch Some Outputs In Two Different Log Files In Bash?

Jan 26, 2009

I want to catch some outputs in two different log files in bash, file simple.log and all.log So far, the script is started like this:


xterm -e "(./ | tee -a simple.log) >& all.log"

What I want is:

- In simple.log, I want all the stdout but WITHOUT errors.

- In all.log I want BOTH stdout and stderr.

So all is ok, and the output becomes:



starting copying files
mv: cannot move ... : permission denied
copying completed
simple log


starting copying files
copying completed

But, in the new xterm, I'm loosing stdout. There is no output.How can I have the files logged as they are but also have the stdout in the xterm.

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Programming :: Null Pointer In Bash?

May 19, 2011

sed -n 8p file.txt

returns the 8th line to the StdOut.

If I assign the value to the variable line = $(sed -n 8p file.txt)

and now print it out with echo

echo $line

the line would be printed.

But what if the file has only 4 lines. What value would be assigned to the variable line?

I want to know that because I want to only print it if the value is "something", that is not null.

In Java for example I would do it like this...
String line = "";
line = reader.readLine(); // or anything else..

How would I check if the value is not "null"(I don't know if bash knows null)

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Programming :: Catch User Input While The Bash Script Is Running?

Oct 30, 2010

How do you catch user input while the script is running? Or, how would you make two scripts run at the same time, but use input from one script to the other? The program I'm trying to make, echos text on the screen continuously, but while thats happening, I want the user to be able to input something, so the program can detect the input and display something else. So I thought maybe I could make two scripts run to do each task.

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Programming :: Reading A Binary File (Ignoring Null Terminator)

Jan 12, 2011

I need to read a binary file using my C++ application. That binary file may contain arbitary characters and it also contains 0 at some places. I need to read the file without considering null terminating character. (i.e. considering 0 as a normal byte and not as the end of the string)Can some one suggest me a method to read the buffer while ignoring the null terminated character.

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Programming :: Svnsync File Not Found Error

Apr 6, 2010

I'm trying to do a svnsync of this public repo: so I can access the repo when my machine is offline. I get this error at revision 419 svnsync: File not found: transaction '419-bn', path '/devel/Scripts/Engines/Doom/Lamp Room/LampController.cs'

I am using svnsync, version 1.6.5 (r38866)

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General :: Error Opening Matrix File (null) For Reading"

Dec 22, 2010

I have installed CUDA-BLASTP on C2050.It is giving me an Error:"Bad address Error opening matrix file (null) for reading" while i am running with following query file and dataset:

./CUDA-BLASTP -i ./data/raimondii_contigs.fasta -d ./data/DB_sorted.fasta

and i am using BLOSUM62 as a matrix file which is already present in package.

And getting the error:"Error happened when the number of GPUs is 0" while i am running CUDABLASTP with a part of dataset taking as a query file and dataset is same. above mentioned error is comming from file "" included in package.

printf("Error happened when the number of GPUs is %d
", localGPU_N);

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Programming :: Bash Script Giving Unexpected End Of File - Syntax Error

Apr 12, 2010

I have a bash script giving me the following error:


When I run it I am getting: ./svnup: line 61: syntax error: unexpected end of file Can't for the life of me figure out what is wrong. It's a script to export the latest revision from SVN to the web root folder and archive the previous version, basically.

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Programming :: Bash: Send Clipboard To Festival?

Jan 24, 2010

How I send clipboard to festival or what is wrong here? #!/bin/bash

text='xclip -selection clipboard -o'
echo '(voice_nitech_us_awb_arctic_hts) (SayText "$text")' | festival

Says only "dollar text" to me. Just this works, but I want other script with different voice: #!/bin/bash
xclip -selection clipboard -o | festival --tts Voice changed here: echo '(voice_nitech_us_awb_arctic_hts) (SayText "say this please")' | festival

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Programming :: Send Block Device Name To Bash Variable?

Feb 13, 2009

I'm setting up a machine that's going to be used to test randomly connected tape drives one at a time, and as such, I'm writing the test routine using mt in a bash script, for user-friendliness. The problem is the block device name changes on occasion as tape drives are swapped out and busses are rescanned, so I can't "hard code" a block name into the script.

I know programs like lsscsi and hwinfo will give you block device names as part of their output, but I can't seem to grep anything in such a way as to have the final output be just the block name (ie /dev/st2, or optimally 'st2'), so that I can just have the script read said output, and drop it into the necessary variable.

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General :: Bash - Catch Or Stop A Shut Down From The Terminal?

Sep 12, 2011

Is there a way to catch or stop a Linux shut down after a reboot, halt or shutdown command has been entered?sudo shutdown -r +10 I should now have 10 minutes before the computer shuts down. If I change my mind and decide that I still want to continue running, how could I stop the shut down?

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Software :: Pop-up - Program Executable - Null - Could Not Be Found ?

Dec 10, 2010

I've installed a few too many interesting items with Yumex into Fedora-14..

When I click to download an interesting pix, for my editing hobby, I get this here pop-up after saving the pix:

"The program executable (null) could not be found. Make sure that ClamAV/ClamWin is installed properly and check the Fireclam settings."

I searched Yumex for Clam and Fireclam, and they aren't installed, and I don't want it installed, because Clam slows-down the operation a lot in these prehistoric old towers...

Seems I installed a peripheral for Null and Clam, but what could it be..? I've searched through Yumex.. I just can't figure it...

I installed all the "nulls", hoping that would eliminate that irritating pop-up.. It didn't... Seems my only option is to reinstall the OS to get rid of the pop-up.. Is there another option?..

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General :: Bash Script Variable NULL Instead Of Value Of Expression?

Nov 17, 2010


for i in {1..10}
for j in {1..50}


The first echo generates something like: The second echo generates:

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Programming :: Bash Script - Source Not Found

Feb 25, 2011

I want to edit the environment with a bash script, a part of my script is showed in the post. Its not everything, but the rest is working fine. At the begin of my script I've the follow line Code: #!/bin/bash
set -e First I tried with this solution. Code: sudo chmod 777 /etc
sudo rm /etc/environment
echo 'PATH="/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/games:/usr/local/ruby/bin"' > */etc/environment
sudo chmod 755 /etc
source /etc/environment Error, source not found

The second solution was this:
Code: sudo chmod 777 /etc
sudo rm /etc/environment
echo 'PATH="/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/games:/usr/local/ruby/bin"' > */etc/environment
sudo chmod 755 /etc
. /etc/environment
This one didn't give an error, but if I try this:
Code: ruby -v got an error
so the environment didn't worked.

If I use both commands
Code: source /etc/environment
Code: . /etc/environment
In the terminal, without a bash script, it works, so if I do
Code: ruby -v
It works and showed the right version.

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Server :: Kernel Panic - WARNING: Can't Access (null) Exec Of Init ((null)) Failed

Aug 5, 2010

I have a server running Red Hat Enterprise Linux ES ( When it starts up I get the following error: Uncompressing Linux... Ok, booting the kernel. Red Hat nash version starting WARNING: can't access (null) exec of init ((null)) failed!!!: 14 unmount /initrd/dev failed: 2 Kernel panic - not syncing: Attempted to kill init!

After that I got no response from the OS. I have the installation CD, so I tried to start the rescue mode, while going through the steps I received an error stating that mounting to /mnt/sysimage failed and that if I want to I can access a shell. I really don't know what to do from here

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Programming :: [C++] Cannot Catch SIGPIPE Signal?

Mar 27, 2011

I have a Socket library, written in C++, in which the method used to send data never has the opportunity to handle an errno of SIGPIPE. Thus I thought perhaps I should setup a signal handler to receive the signal, but this too is not being called.Is there something that I am missing or doing that is completely wrong? Below is the relevant code. Note that a SIGPIPE signal is generated when the Server is unable to send data to the Client (e.g. the client has terminated).Server code:

#include <TCPServerSocket.hpp>
#include <string>


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Programming :: How Sed Can Catch Variable From Input?

Feb 2, 2011

right now i am writing bash script for simple everyday todo tasks.script consisit of two files, fisrt is just script (which can delete/append /clear) and second one is todolist.txt which stores my notes.I am litlebit confused about sed!!for example, If my todolist.txt have these lines:

- Writing my Homework
- take my girlfriend to launch
- Take a break

How can sed take my input $@ and delete all line with name "Homework"..i trayed with many sed combination like:

sed s/$@//g
sed 'd/$@/'
and many more combination with ""/'' or bracket but nothing helped

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Programming :: Send File Through Raw Socket Using C Programming

Jul 23, 2010

I am currently doing a research on video transmission over wireless LAN. I tend to transmit my offline file (xx.svc) from server to client.It may sound stupid (since I have a very little knowledge about c programming and raw socket), but my biggest challenges is that when I want to write the file to the buffer, how actually to define/include the file at the programming coding? where I need to locate the file? Is it at the same folder with my c programming, or somewhere in the linuxinclude folder?

Can anyone just give a simple example on how to include a file and write it into a buffer before send it through raw socket.

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Programming :: Socket Programming Send File

Jun 22, 2009

this is my client and server. I can receive text file. but I can't send other type of file like PDF,Docx,Odt

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Programming :: Global Bash Shell Functions - Line 2: Echotm: Command Not Found

Sep 13, 2010

I wonder if there is anyway to make a user-defined bash shell function global, meaning the function can be use in any bash shell scripts, interactively or not. This is what I attempted:


$ tail -n 3 /etc/bashrc
echotm () {
echo "[`date`] $@"


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Debian Installation :: Error Message - Bash / Visudo Command Not Found

May 24, 2015

I have just installed Debian 8 with Gnome desktop and trying to add my username to sudoers list.

When I open terminal and enter visudo I get the following error message...

Code: Select allfracmo2000@debian:~$ su
root@debian:/home/fracmo2000# visudo
bash: visudo: command not found

Although I am quite new to debian, I have done this successfully in the past so not sure why this is happening?

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General :: Bash - Links -command Not Found - Error In Apache Server

Nov 6, 2010

I am using rhel5 with ip am using rhel on vmware 7. when i run links then i got error "bash : links : command not found" i want to know why this error is showing? when i use red hat without vmware then there is no problem.

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Debian :: Determine File Type On Bash - Command Not Found

May 10, 2015

I cannot find a bash command: "file" !

It say "-bash: file: command not found"

"file" is used to determine file type on a bash right ? is there a package i have to install ? deprecated ?

I use debian wheezy distro

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Programming :: Catch System-level Exceptions?

Jan 24, 2011

The following C++ program doesn't catch the exception:

#include <iostream>
using namespace std;


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Programming :: Unable To Catch The SIGTERM Signal?

Apr 25, 2011

But unable to catch the SIGTERM signal if I do shutdown, as man pages says shutdown genrates the SIGTERM and SIGKILL signals, but we cant handle the SIGKILL signal. My code is working fine if I genrate the SIGTERM signal by Kill command, and also for SIGINT signgal genrated from the CTRL+c key.

Here is my code:

/* Example of using sigaction() to setup a signal handler with 3 arguments
* including siginfo_t.
#include <stdio.h>
#include <unistd.h>
#include <signal.h>
#include <string.h>


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Programming :: Send File With FTP From Small Version?

Feb 9, 2011

I have this problem.I need to do this:I got a small version of Linux installed in some small devices. These devices come from the provider with this small version of Linux installed.This devices should send data to some other machine in the internet. I have tested wput for this purpose with a PC which has an Ubuntu version 10 and it works fine. However, when I try wput in the small device, I get an error. It seems that the wput might need some libraries to work with the small version of Linux installed in the small device.The fact of using wput or not is optional. I just need being able to send files through ftp with this small version of Linux.The thing is that to be able to run wput in this small version of Linux, it seems that many of the needed libraries were missing. So what I did was just install all the needed libraries. But still the wput program fails in its first line.

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Programming :: Send Text File Over Socket

Nov 20, 2008

how can i send a text file from server to client? the problem is, i dont know how to send those two file to the client ( center node)

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Programming :: Bash File Comparing - Report How Many Matching Words My Main File ?

Jun 9, 2009

I have been messing with diff and grep for 2 days now without result

I am trying to match a file consisting of words to many separate other wordfiles in a specific directory. one by one.

What i want the script to do is to report how many matching words my main file has with every file in the directory, each in turn


Each of em are plain text files with 1 word per line

Output should be something like:


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Ubuntu :: Error On Startup - Error Where Found When Mounting The Disk File

Apr 20, 2011

I was installing last night some applications , then i forgot to plugin my laptop so suddenly it turned off , anyways today i turned it on , while booting it gave me this error : "error where found when mounting the disk file /"so i press I to ignore , and it works , but now how can i fix this error?

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General :: Error Occurred While Installing GRUB - Error 15: File Not Found

Aug 11, 2010

I am having a problem installing SLES11 on a new server. It goes fine through the setup until it gets to GRUB, it gets me the following error message: Error occurred while installing GRUB


I cant continue the installation without this

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