Tagged Questions
1
vote
1answer
42 views
Change a value in a config file, or add the setting if it doesn't exist?
When modifying config files from the command line, I often want to find the setting in the config file and modify that line if that setting exists. If that setting doesn't exist, I want to add it to ...
1
vote
0answers
31 views
Changing KDE's mouse theme and buttons settings from a shell script
I'm trying left handed mousing, and I want to be able to easily switch between right handed mode and left handed mode. There is a utility for Windows called SwapMouseButtons that allows to bind a key ...
0
votes
1answer
63 views
Recursively delete hidden directory & its files?
I want to delete all hidden directoris from a directory and its sub-directory.
I also use rm -rf .directory_name this command is iterative command I want to a recursive command.
Please anybody help ...
1
vote
1answer
57 views
What is the Command to check the history of the command executed which should based on the user who accessed it [closed]
I am looking for the command or script to meet the following requirement.
I wanted a history of all the users who connected to my machine and what commands they execute in there session and at which ...
4
votes
2answers
196 views
Dump process's stdin and stdout
I have two processes, let's say Parent and Child. Parent launches the Child and communicates with it through child's stdin and stdout.
Parent <-> Child
These processes use text protocol and I ...
1
vote
1answer
94 views
Is there a graphical shell or scripting environment for Linux?
I would like to draw my scripts and connect commands like blocks of functions (something similar to Yahoo Pipes). Does such an environment exist or do I have to develop it myself?
0
votes
0answers
20 views
Multiply 2 array index variables shell programming [duplicate]
How do i multiply 2 array index variables given the following
foo=(1 2)
bar=(0.1 0.2)
foobar=$((foo[1]*price[1])) # this is wrong
echo "$foobar"
Current output : 0
Correct/Expected output : 0.4
1
vote
1answer
58 views
Does cron impose some limitations to types of commands and privilege of execution? [duplicate]
I've experienced an issue where some of my scripts run perfectly fine when I call them manually, but these same scripts when called as cron jobs via cron don't seem to work at all.
So my question: ...
-2
votes
1answer
83 views
how do I make a $VAR empty so it don't effect the command line argument and still be within that argument?
This is the basic setting for hsetroot for it to work: hsetroot -center /path/to/image/ - setting the wallpaper with just that the picture. To use these options, just one has to be place within the ...
3
votes
3answers
301 views
How to move the first x files
I have this huge folder with thousands of unordered files. Is it feasible to move the first 5000s to a subfolder via the mv command? For now I move files with
mv *some_pattern* ./subfolder1/
...
0
votes
1answer
410 views
Script for running sequential job
I started recently to learn using Linux. I want to write a script in bash shell to run a serial job on a cluster. I have been searching for hints and instructions on how to write such a script. I ...
0
votes
2answers
202 views
how to run .dump command in linux? [closed]
I want to create dump file of sqlite database from java but I can't run the below command from linux. I got the help of windows and I tried with linux but it appears one terminal nothing more than ...
2
votes
1answer
171 views
Merging folders with practically the same name but different casing
When digging around in the advanced settings in Dropbox I lost a folder. I only discovered this about a month later. I managed to get this folder back from Dropbox however the file structure of the ...
2
votes
1answer
85 views
Any better method than this for sorting files by their creation date?
I needed to display a list of directories sorted by their creation date and I came up with this code snippet that I thought was kind of clever. Is there a more obvious way to do this that I'm missing?
...
1
vote
1answer
83 views
What is the use of ; in a single line command?
What does ; mean in single line scripts like this:
while true; do sudo -n true; sleep 60; kill -0 '$$' || exit; done 2>/dev/null &
Does it mean new line, or "next command"?
4
votes
3answers
939 views
Use & (ampersand) in single line bash loop
I have been using this command successfully, which changes a variable in a config file then executes a Python script within a loop:
for((i=114;i<=255;i+=1)); do echo $i > numbers.txt;python ...
1
vote
3answers
268 views
Which cmd is the best for determining the OS' word size (32/64)-bit? [duplicate]
I need to find my OS (not hardware) is 32-bit / 64-bit. Which command is best?
uname -p
uname -i
uname -m
arch
All the above commands returns the same answer:
On 32 bit systems: i686/i386
On ...
4
votes
4answers
761 views
Why cat, grep and other commands can't understand files starting with minus sign? [duplicate]
If I have a file which name starting with single or several minus sign, for example --1 it can't be used as a parameter of many commands. Even if I run
cat --1
instead of file content I get ...
2
votes
1answer
1k views
Start 4 programs on startup in Linux Mint via terminal
I'm working on a project and I hope you can help me solve a problem.
I have four programs that are written in C. They have been compiled using gcc and they work as they should. Because the four ...
2
votes
2answers
87 views
How can I execute a shell script that exists in a longish path with a single command without first cd'ing to the directory?
In Linux I always cd to a longish path and then run the script:
cd /scratch/someDir/someOthernestedDir/
./shellscriptName.sh
How can I avoid achieve typing this longish path and then executing ...
2
votes
1answer
115 views
Is there a text-only equivalent (no curses) of `zenity --question`?
For my mercurial commit hook, I want to run my test cases and be asked whether I really want to commit if any of the tests fail. I'm thinking something like <run-the-tests> || ...
3
votes
2answers
374 views
How can I determine if HTML5 player is running in browser?
I would like to find a command-line or a script that will show me if HTML5 player is running or not in a browser (firefox or chromium).
For example, to determine if Flash player is running in a ...
0
votes
0answers
746 views
IBM V7000 scripts for monitoring
Hello (I'm no hard core coder:),
I try to develop a script to do some very basic monitoring on an IBM SVC.
My goal is to get some information about the nodes and my quroum status and then send ...
0
votes
4answers
123 views
concatenating multiple files with multiple headers
Im trying to concatenate multiple files with multiple headers to have one file with all the information in it for example.
File 1:
Numbers
1
2
3
Letters
A
B
C
File 2:
Numbers
4
5
6
Letters
D
E
...
2
votes
1answer
378 views
Help me parse this `find` command
Following command tells me the length of mp4 video files:
find -type f -name "*.mp4" -print0 | \
xargs -0 mplayer -vo dummy -ao dummy -identify 2>/dev/null | \
perl -nle ...
3
votes
1answer
232 views
Pausing rsync via bash script?
Is there a way to pause rsync via command line, if it transfers data for over X minutes? I'm working on using it as a backup and would like it to pause every once in a while to prevent the hard disks ...
3
votes
2answers
189 views
Make copies of a single directory to multiple directories with different names
I'm trying to replicate a single directory (with sub-directories) to a bunch of new directories based on a list. For example I can:
mkdir Fred Barney Thelma Louise Foo Bar
How would I copy a premade ...
3
votes
5answers
16k views
How can I monitor all outgoing requests/connections from my machine?
My machine is a server so I want to ignore connections being made to my server (e.g. when someone visits my website). I want to see only connections/requests being made by my server to other places.
...
2
votes
2answers
853 views
Concatenate multiple files under subdirectories
My directory structure is given below
x:\Project_2012-158A\Sample_4041
SampleSheet.csv
4041_CGTACG_L002_R1_001.fastq
4041_CGTACG_L002_R2_001.fastq
4041_CGTACG_L006_R2_001.fastq
...
2
votes
1answer
120 views
Output redirection and spaces
I'm paranoid about this, but hopefully it's a simple question:
Is there any difference between
cat file1 | egrep -oP "[Mm]y string" > /home/user/file.txt
and
cat file1|egrep -oP "[Mm]y ...
3
votes
1answer
351 views
Extract directory from wget's stdout
I am trying to wget a tarball from github.com and, without creating a temporary file, extract a subdirectory from it:
wget -qO- https://github.com/django-nonrel/django-nonrel/tarball/develop | tar ...
2
votes
2answers
840 views
How to make duplicates with different names from a single file? [closed]
I want to duplicate the contents of a file. Suppose there is a file named "Hydrogen.element". I want to duplicate the contents of this file with a different name ie.make another file named ...
2
votes
2answers
347 views
Executing zsh rehash after build
I have a build script that can change what binaries are in my $PATH (it doesn't edit $PATH itself, but it adds/deletes files to folders that are already in $PATH). zsh's autocompletion doesn't update ...
2
votes
1answer
142 views
How to have find only search for files in changed directories?
Currently I'm repeatedly doing a 'find' that's too slow. I'm searching for non-hidden executable files within "$root", excluding "$root/bin":
find "$root" -type f -perm -o+x -not -path "$root/bin/*" ...
17
votes
1answer
478 views
Is there a standard command that always exits with a failure?
I want to test my script with a command that fails. I could use an existing command with bad arguments. I could also write a simple script that immediately exits with a failure. Both of these are easy ...
5
votes
2answers
959 views
How to tweet using terminal?
I would like to tweet a message using terminal.
I tried something like:
curl -u 'TwitterUsername':'TwitterPassword' -d status=”Your Message Here” https://twitter.com/statuses/update.xml
but seems ...
11
votes
2answers
5k views
find n most frequent words in a file
I want to find, say, 10 most common word in a text file. Firstly, solution should be optimized for keystrokes (in other words - my time). Secondly, for the performance. Here is what I have so far to ...
7
votes
2answers
487 views
Shell Script for going through a dir recursively and chmodding based on conditions of file type
Can anyone point me to either code or a tutorial for writing a shell script that can recursively go through an entire directory structure (starting at the current working directory, or given an ...
0
votes
1answer
263 views
Run a script after some command were executed
I have a list of scripts
./myscript <param> | grep "asd"
./myotherscript <param> <param> > file
...
How can I automaticaly run another script when one of these command in the ...
3
votes
2answers
2k views
Passing a bash command-line argument containing a dot
How can a command-line argument containing a dot (.) be passed? Are there any escape sequences for capturing characters like dot?
The following invocation of a bash-script from the shell does not ...
2
votes
1answer
4k views
How to get exact file size and file name?
Right now I am using ls -lt /my/directory (see below) then php parses the output. But inconsistently because the delimiter is space and there might be two or more spaces in between two fields.
The ...
1
vote
1answer
715 views
How to format a curl command for a special task?
There is a search page in a form http://site.com/search.php and it sends a search query via POST request. I want to fetch this request via curl command line tool to inspect a POST request.
The HTML ...
4
votes
1answer
1k views
How to create a confirmation question in Linux?
I have a certain command (git push server-name) that has major consequences. How to require confirmation for this command only? It should ignore white space.
The confirmation could be Enter 'yes i am ...
0
votes
2answers
347 views
Functional shell scripting [closed]
I found out that when I want to create some shell script or advanced command it always made me trouble to remember the names of the commands and their switches.
e.g.
tr -d '\n' < file | wc -c
...
0
votes
1answer
1k views
How to pkill from a script?
How can I write a script that basically just runs pkill -HUP inetd? I want to restart inetd via a script so I can schedule it to run at a particular time. I tried to write it myself, but I'm getting a ...
7
votes
4answers
722 views
What is the easiest way to execute text from tail at the command line?
Sometimes I'm working on a new (ubuntu) box and I type git and am alerted:
The program 'git' is currently not installed. You can install it by typing:
apt-get install git-core
If that happens I ...
0
votes
1answer
296 views
Postgres 9.0 linux command to windows command conversion [closed]
i am working on an application using delphi 7 as the front end and postgres 9.0 as the back end.
I have to upload images to the server so i use \lo_import and \lo_export for inserting images on the ...
4
votes
4answers
2k views
How can I pass a command line argument into a shell script?
I know that shell scripts just run commands as if they were executed in at the command prompt. I'd like to be able to run shell scripts as if they were functions... That is, taking an input value or ...
-1
votes
2answers
3k views
clear tmpfs in my case
I am on a Ubuntu machine.
I have make a directory under root directory, by:
$ sudo mkdir /hello
$ sudo mkdir /hello/bye
Then I mount tmpfs with size 1024M to /hello/bye by:
$ sudo echo "tmpfs ...
3
votes
2answers
613 views
Move with possible rename
Is it possible to construct a command that will move the file to another directory and if the same file is already there, generate some random string that is not in the name of some file in the ...
