The command-line is the interactive interface to your shell.
3
votes
1answer
29 views
Screenshot of non active window
How to take a screen shot of non active window? If I have 2 windows, I want to capture the screenshot of the one which is running in the background.
4
votes
2answers
29 views
Commandline global proxy program?
I'm living in China, and lots of web service is not available or stable here like Github/Bitbucket/Imgur, When I'm using wget, git or some other commandline tools, I need using a proxy.
Is there any ...
3
votes
3answers
71 views
How can I display octal notation of permissions with ls - and can octal represent all permissions? [duplicate]
After looking at the man page for ls on my system and searching Google, I see there IS a hack of way to use awk or perl to show octal permissions when using ls, but with bash is there anything more ...
1
vote
3answers
41 views
Renaming only part of a file using CLI [duplicate]
I realise this might be quite a simple question, but I'm still quite new to the command line and only have a grasp of basic commands.
I've downloaded some lecture presentations (~25 or so) from my ...
1
vote
1answer
39 views
What does this code do? [duplicate]
I've found this code in a tweet:
:(){ :|: & };:
It said something about fork, but I don't completely get how it works. Could anybody please explain in detail what it does and how it works?
...
1
vote
2answers
68 views
Executable located in location A how to run it in location B?
So, I've an executable in my debian server and this executable located in /home/human/ExecuteIt, still i cant figure it out how to run my executable in another location. In my case it is ...
4
votes
2answers
52 views
Bash commands with spaces in them (git config or git-config?)
Please forgive me if this seems easy, but I only started learning Unix 2 days ago.
Basically, I have been taught that when typing a command into the terminal it needs to be of the form:
[command ...
0
votes
2answers
238 views
access a command line via a web browser
2 questions:
Question 1
My job blocks ssh which means that I cannot ssh to my home server. However, they do allow https out. Is there a package out there for ubuntu that will allow me to connect to ...
0
votes
2answers
110 views
sqlite fts quoting problem
I can do this in sqlite tool:
sqlite> select caption from notes_fts where notes_fts MATCH '"perl install"';
but cannot from the Linux shell i.e., this fails:
user@host:~$ sqlite3 sqldb ...
3
votes
0answers
34 views
How do I make the CLI run on dedicated graphics?
I just finished my Gentoo minimal install and the first thing I wonder is why I get no picture. I did have signal on the live CD, so that was pretty odd. I plugged the monitor into the Intel HD ...
11
votes
4answers
3k views
How can I convert a PNG to a PDF in high quality so it's not blurry or fuzzy?
There are a lot of questions out there about how to convert a PDF file to a PNG image, but I'm looking to take a nice sharp PNG file and just basically wrap it or embed it in a PDF file without having ...
15
votes
6answers
2k views
Command-line-friendly full-text indexing?
Is there such a thing as a full-text indexing engine, that can be queried from the command line and ideally wouldn't require using a gui at all ?
I'm especially interested in indexing my ebooks and ...
1
vote
2answers
64 views
What does the tilde (~) mean at the end of a filename? [duplicate]
What is the file with the ~ at the end of the filename for?
$ ls # aliased to add flags
-rwxrwxr-x 1 durrantm 2741 May 16 09:28 strip_out_rspec_prep_cmds.sh~*
drwxrwxr-x 13 durrantm 4096 May 16 ...
1
vote
0answers
31 views
Convert ASCII-8BIT to UTF-8 using OSX' .bash_profile
When running certain rails scripts in OSX' Terminal, I get warnings such as the following:
unable to convert "\xA9" from ASCII-8BIT to UTF-8 for ...
0
votes
1answer
35 views
Opera, Firefox has no kiosk option like Chrome gives it openly?
While using Chrome kiosk mode, i have problem with openbox desktop, its not doing correct for some javascript rendering. So i wanted to test opera and firefox but both does not support kiosk at all ...
-1
votes
1answer
42 views
Delimiters of program arguments?
What is the syntax to delimit the arguments of a C program.
For example, if I type :
./myprogram 1 2 3 | grep result
The | grep result will be interpreted as arguments (and passed as argv). So how ...
2
votes
3answers
140 views
Why does Firefox refuse to die despite killing it with pkill -9?
I am issuing the following command to kill Firefox on my Red Hat Linux box:
[subhrcho@slc04lyo ~]$ pkill -9 -f firefox
[subhrcho@slc04lyo ~]$
However, when I try to invoke Firefox through ...
75
votes
13answers
10k views
How to do integer & float calculations, in bash or other languages?
Using echo "20+5" literally produces 20+5
What command can I use to get the actual sum, e.g. 25 in this case.
Also, what's the easiest way to do it just using bash for floating point, e.g.
echo ...
0
votes
1answer
52 views
Add a new user steps for Oracle Linux 5
It's been over 10 years since I last used RedHat (which I believe that Oracle Linux came from). So I cannot remember the steps to create a new user, add them to the appropriate groups, set up their ...
2
votes
1answer
41 views
Always redirect error to /dev/null
I know I can redirect the error messages from a command to /dev/null using the following syntax:
command arg1 arg2 2>/dev/null
But is there a way to do this by default so that the error messages ...
7
votes
3answers
5k views
Is it possible to mount a gzip compressed dd image on the fly?
I like create an image backup for the first time I'm backing up a system. After this first time I use rsync to do incremental backups.
My usual image backup is as follows:
Mount and zero out the ...
1
vote
2answers
31 views
Splitting large PDF into small files
Using pdftk it is possible to extract page ranges from a pdf using
pdftk a.pdf cat 124-end output b.pdf dont_ask
I have a bunch of huge PDFs with about 500 pages and over 100 MB, is it possible to ...
7
votes
2answers
1k views
How to Determine the Amount of RAM Slots In Use?
I forgot how many RAM modules are installed on my laptop. I do not want to unscrew it but want to look it up on the console. How do I gather this information?
1
vote
2answers
256 views
How to find and replace files contents that match a pattern?
Suppose we have a folder named Project.
I would like find each file in the folder that contains the pattern &$
at the function call.
For example should replace:
AnyFunction(&$arg);
with
...
1
vote
2answers
350 views
Is nohup indefinite?
If I run a program with an infinite loop with nohup, will the program run indefinitely (until the machine is reset or until I manually terminate it)?
3
votes
2answers
451 views
Oneliner for slicing an image?
I'm looking for a oneliner command that would slice an image into given proportions.
Say input would be filename and slice dimensions. Are there any standard command-line tools for this? I tried ...
1
vote
2answers
51 views
Chaining mysqldumps commands to output a single gzipped file
Let's say I have these series of commands
mysqldump --opt --databases $dbname1 --host=$dbhost1 --user=$dbuser1 --password=$dbpass1
mysqldump --opt --databases $dbname2 --host=$dbhost1 --user=$dbuser1 ...
0
votes
1answer
170 views
How to monitor other nodes to get RSSI?
I need to measure RSSI between two peers of nodes in same network.
If I have these two information:
SSID for their network.
IP for the target node to get the RSSI regarding it.
So I found this ...
1
vote
0answers
40 views
Install Linux Mint 14 from CLI
I'm trying to install Linux Mint 14 from a live cd on a HP Pavilion laptop. I got some problem with X and the nvidia card, which prevents X from starting (and therefore prevents the live installer ...
6
votes
6answers
5k views
Efficiently delete large directory containing thousands of files
We have an issue with a folder becoming unwieldy with hundreds of thousands of tiny files.
There are so many files that performing rm -rf returns an error and instead what we need to do is something ...
0
votes
1answer
42 views
How to generate 4 WEP keys with linux commands?
I have a sagem router. this router is able to generate 4 WEP keys from a given passphrase.
Example:
Passphrase: "hahahahahahahahahahahahahahahahahahahahahahahahahahahahahahahaha"
key1: ...
1
vote
1answer
99 views
Right way to start VirtualBox with shared folders mounted
Need of commandline to start VM with access to shared folder. Now if I run
/usr/lib/virtualbox/VirtualBox --comment "win" --startvm "c252555c-bla-bla"
I get VM running but shared folders not ...
5
votes
4answers
832 views
Make cd automatically ls
I find that I often do the following:
%> cd bla/bla
%> ls
I would like it that whenever I cd into a directory it automatically does an ls.
I fiddled with my .bashrc for a while, but couldn't ...
2
votes
4answers
45 views
Use xdg-open to open a url with a new process
I'm starting to experiment with Crunchbang (which is based on Debian, and uses terminator) as a web development environment, and one of the things I am struggling with is the behaviour of xdg-open. I ...
4
votes
1answer
361 views
Find links and their positions in a PDF
I need to find all links in a PDF file, along with the page they're on and their X/Y position. Is there any tool or combination of tools I can use to do that?
3
votes
1answer
78 views
Understanding grep --label=
I am looking for an explanation how grep --label=LABEL works: Maybe somebody can give me an example [or two] on what --label= is for.
I understand what grep and zgrep are supposed to do – the ...
4
votes
3answers
87 views
How to constraint time a program runs in Linux?
I have several simulations to do, each is invoked with python simulate.py <parameter list>. The problem with these simulations is that some of them hang without quiting, which prevents me from ...
1
vote
1answer
224 views
automate login as sudo and su
I know the security risks, but I am performing this experiment/excercise on an old, seldom used *nix machine I have laying around the house. So doing this excerise will not bring any security risk to ...
1
vote
1answer
36 views
How to retrieve information about locked accounts
Is it possible to retrieve info regarding to locked unix accouts?
I am interested in seeing information about what date and time the lockout happend and from what hostname (pc name). I would like to ...
3
votes
1answer
799 views
How to mount a Truecrypt container with a timeout from the command line?
I'm mounting a truecrypt container via the command line (i.e. truecrypt file dir). Is there any way to have truecrypt automatically unmount the container after a given amount of inactivity in dir?
2
votes
2answers
62 views
Get network information through Ubuntu Terminal
Is there a command where, when entered outputs information such as:
If the network connection is wired or wireless
if it is a wireless network, the name of the wireless network
How strong the signal ...
2
votes
3answers
75 views
Use sed to find whole word and replace
I have the following block of text in a file:
test3.legacy test4.legacy test3 test3.kami
I only want to search for test3 as a whole and replace it with nothing. Unfortunately, all my attempts have ...
11
votes
2answers
876 views
Is there a way to intercept interprocess communication in Unix/Linux?
For intercepting/analyzing network traffic, we have a utility called Wireshark.
Do we have a similar utility for intercepting all the interprocess communication between any two processes in ...
4
votes
2answers
943 views
How to merge patches
Sometimes I need to merge two patches. I can apply them but often it is not convenient (coping, temporary files etc.). Is there a tool to merge patches (assuming they are not conflicting)?
11
votes
7answers
2k views
Isn't less just more?
When I do more filename and less filename, it would seem that the resulting terminals are quite similar. I can navigate and search through my files identically (j, Space, /pattern, etc.).
I find it ...
5
votes
4answers
2k views
How to have separate command history for different sessions for the same user?
I face this issue on some of Unix servers. When I open different session for same user, command history is shared by all the session. This creates issues if by mistake I press Ctrl-P or up arrow and ...
5
votes
3answers
483 views
Any tips for surviving Terminal.app?
I've recently switched to using a Mac full-time, and am having trouble getting used to Terminal.app after years of loving gnome-terminal. I miss having URLs show up underlined, using alt+arrow to ...
8
votes
6answers
482 views
Best way run a command on each file in a directory tree
There appear be a number of ways to do this including loops in shell script, find and xargs. Which of these is best, and which is most portable?
0
votes
2answers
53 views
Grep to search directories for patterns inside a text file
I have a file where it contains a list of search patterns (searchPattern.txt). Its contents is similar to the contents below where there are 3000+ of them.
123456
234567
345678
.
.
.
What I wanted ...
12
votes
8answers
10k views
Converting multiple image files from JPEG to PDF format
I want to convert some files from jpeg to pdf. I am using following command.
$ convert image1.jpg image1.pdf
But I have 100 images. How should I convert all of them to corresponding pdfs?
I ...
