155 Answered Questions for the topic Linux

Linux Unix Grep Centos

04/20/19

How to grep a string in a directory and all its subdirectories' files in LINUX?
How to grep a string or a text in a directory and all its subdirectories'files in LINUX ??
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Expert Answers •1

04/18/19

Where can I set environment variables that crontab will use?
I have a crontab running every hour. The user running it has environment variabless in the `.bash_profile` that work when the user runs the job from the terminal, however, obviously these don't get... more
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Linux Java

04/14/19

Error: Could not find or load main class?
I am having trouble compiling and running my Java code, intended to allow me to interface Java with a shared object for Vensim, a simulation modeling package. The following code compiles without... more
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Expert Answers •2

04/13/19

What are the determining factors when making a decision between FFMPEG and GStreamer when designing an audio application in Linux?
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Linux Curl Proxy

04/12/19

performing HTTP requests with cURL (using PROXY)?
I have this proxy address: `125.119.175.48:8909` How can I perform a HTTP request using cURL like `curl http://www.example.com`, but specifying the proxy address of my network?
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Expert Answers •1
Linux Find Text Grep

04/12/19

How do I find all files containing specific text on Linux?
I'm trying to find a way to scan my entire Linux system for all files containing a specific string of text. Just to clarify, I'm looking for text within the file, not in the file name. When I was... more
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Linux C Unix

04/11/19

Why does ENOENT mean "No such file or directory"?
What is "ENT" short for? The `error` : >No such file or directory should just be named by "ENOFILE". Is there any story or reason?
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Linux Cpu Bash

04/09/19

How to obtain the number of CPUs/cores in Linux from the command line?
I have this script, but I do not know how to get the last element in the printout: cat /proc/cpuinfo | awk '/^processor/{print $3}' The last element should be the number of CPUs, minus 1.
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Linux Unix Syntax Bash

04/04/19

How do I syntax check a Bash script without running it?
Is it possible to check a bash script syntax without executing it? Using Perl, I can run `perl -c 'script name'`. Is there any equivalent command for bash scripts?
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Linux C++ C Api

04/04/19

What is Linux’s native GUI API?
I hope this doesn’t come across as a stupid question but it’s always something I have wondered. Both Windows (Win32 API) and OS X (Cocoa) have their own APIs to handle windows, events and other OS... more
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Expert Answers •1

04/04/19

How to kill a process running on particular port in Linux?
I tried to close the tomcat using `./shutdown.sh` from tomcat `/bin` directory. But found that the server was not closed properly. And thus I was unable to restartMy tomcat is running on port... more
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04/02/19

Why does the C preprocessor interpret the word "linux" as the constant "1"?
Why does the C preprocessor in GCC interpret the word `linux` (small letters) as the constant `1`? test.c: #include int main(void) { int linux = 5; return 0; } Result of `$ gcc -E... more
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04/02/19

Will Photoshop run on Linux?
I have installed Photoshop on Linux using wine. It's crashing again and again. Is there any way to use Photoshop on linux?
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Linux Unix Ssh

03/27/19

How to download a file from server using SSH?
I need to download a file from server to my desktop. (UBUNTU 10.04) I don't have a web access to the server, just ssh. If it helps, my OS is Mac OS X and iTerm 2 as a terminal.
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Expert Answers •2
Linux Unix Bash Path

03/27/19

How to permanently set $PATH on Linux/Unix?
I'm trying to add a directory to my path so it will always be in my Linux path. I've tried: export PATH=$PATH:/path/to/dir This works, however each time I exit the terminal and start a new... more
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Linux Unix Bash Shell

03/26/19

Linux: copy and create destination dir if it does not exist?
I want a command (or probably an option to cp) that creates the destination directory if it does not exist. Example: cp -? file /path/to/copy/file/to/is/very/deep/there
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Expert Answers •1

03/26/19

How to convert Word (doc) to PDF in linux?
I have a set of files in **.doc** format, that need to be converted to **.pdf** format. I am using Ubuntu linux.
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03/26/19

How do I get cURL to not show the progress bar?
I'm trying to use cURL in a script and get it to ***not*** show the progress bar. I've tried the `-s`, `-silent`, `-S`, and `-quiet` options, but none of them work. Here's a typical command I've... more
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03/18/19

Lost httpd.conf file located apache?
How can I find where my `httpd.conf` file is located? I am running an Ubuntu Linux server from the Amazon Web Services EC2 (Elastic Compute Cloud) and I can't find my Apache config.
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Expert Answers •1
Linux C++ C Api

03/18/19

What is Linux’s native GUI API?
I hope this doesn’t come across as a stupid question but it’s always something I have wondered. Both Windows (Win32 API) and OS X (Cocoa) have their own APIs to handle windows, events and other OS... more
Follows • 1
Expert Answers •1
Linux Java Install Wget

03/18/19

Downloading Java JDK on Linux via wget is shown license page instead?
When I try to download Java from Oracle I instead end up downloading a page telling me that I need agree to the OTN license terms. > # Sorry! > > In order to download products from... more
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Expert Answers •1
Linux Unix Grep

03/15/19

How do I grep recursively?
How do I recursively `grep` all directories and subdirectories? find . | xargs grep "texthere" *
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03/14/19

How to find out what group a given user has?
In Unix/Linux, how do you find out what group a given user is in via command line?
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Expert Answers •2

03/14/19

How to join multiple lines of file names into one with custom delimiter?
I would like to join the result of `ls -1` into one line and delimit it with whatever i want. Are there any standard Linux commands I can use to achieve this?
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Linux Unix

03/14/19

Using ls to list directories and their total sizes?
Is it possible to use `ls` in Unix to list the total size of a sub-directory and all its contents as opposed to the usual 4K that (I assume) is just the directory file itself? I.E. total 12K ... more
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Expert Answers •3

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