The command-line is the interactive interface to your shell.
3
votes
1answer
38 views
What are the characters printed when Alt+Arrow keys are pressed?
When I press AltUp, A printed to terminal screen. Same thing happened when I pressed AltDown but B is printed instead.
Other characters that I realized;
AltLeft = D and AltRight = C
What is the ...
2
votes
0answers
11 views
QEMU Direct Access to Video Card (or, QEMU Video Output without X11)
I have a system that boots up into Linux at power on and then needs to boot into Windows XP Embedded. After messing around with kexec and grub4dos, things aren't working out too well.
One idea that ...
4
votes
0answers
65 views
why . and .. are listed when ls -a command executed? [duplicate]
When I execute the ls -a command, all files and folders in that directory listed, as well as . and .. are listed too.
Why is that? Are they a file or folder?
0
votes
0answers
10 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 ...
5
votes
2answers
57 views
Combining multiple process substitution
Suppose you tried something like this:
$ paste ../data/file-{A,B,C}.dat
and realize that you want to sort each file (numerically, let's suppose) before pasting. Then, using process substitution, ...
0
votes
1answer
23 views
Jingle CLI client / Jitsi replacement / VOIP
I am looking for a Jingle client for the command line.
Currently, I use Jitsi, but my dreams of not needing the GUI for more than just web-browsing are not realized due to my reliance on this ...
1
vote
1answer
40 views
How to access u boot environment from linux?
How can I access and change the u-Boot env variables in linux. Using the u-boot/tools/env directory in u boot directory:
u-boot$ make env
Which created the executable file fw_printenv. I copied ...
1
vote
1answer
38 views
Confirm before exit the command-prompt
I am trying to have a confirmation message every time I type exit command in the command-prompt. To do this, I have tried to use trap in .bashrc file but it seem like trap is not a solution as it run ...
-1
votes
1answer
29 views
delete file with name --help.tgz [duplicate]
I have file with name --help.tgz. I want to delete but don't know how.
I tried rm "--help.tgz", rm \-\-help.tgz and it did not work. How can I delete a file with such name?
2
votes
1answer
24 views
zsh - check arguments of a command before executing it
Question: Is there an easy way how I can teach zsh to check the command line before executing it? I know that I can completely wrap a specific program with an extra script, but this is not what I want ...
0
votes
4answers
47 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
6answers
119 views
sort ls output by users
On Linux, is there a way to sort ls output by users? What I try to achieve is something like this:
user_a file1
user_a file2
user_b another_file
user_c this_file
user_c ...
1
vote
2answers
79 views
How to avoid the need to issue “y” several times when removing protected file
I'm looking for a solution to be used as
a response to "rm: remove write-protected regular file [x] ?"
I was thinking of issuing a character followed by carriage return for several amount of times, ...
3
votes
3answers
78 views
Count number of lines of output from previous program
I'm trying to count the number of lines of output a certain program produces. The problem is, the program takes a long time to run, and I want to display the output to the user. Is there a way to ...
1
vote
0answers
16 views
rsstail Not Printing Output
I've installed rsstail 1.8 on my linux box and everything seems to be going smoothly, knock on wood, except for the part where rsstail isn't printing the streams. Running the command, I see that it's ...
4
votes
3answers
63 views
Why should 'Character Classes' be preferred over 'Character Ranges' In Shell (Bash)?
The Linux Command Line (Book - page count 47) says:
... you have to be very careful with them [character ranges] because they will not produce the expected results unless properly configured. For ...
0
votes
1answer
49 views
finger and who commands usage
I know that the finger command used to display information about local and remote users.
finger --> display users log in on local machine, even if remotely.
finger @hostname --> display users log in ...
2
votes
1answer
26 views
Alternative to xxd for QNX
I was just introduced to xxd today. See link. I am very familiar with the QNX hd and odcommands, both of which will take input and create a hex dump (or octal dump if you like). See hd and od.
What I ...
0
votes
1answer
32 views
(e)grep and atomic grouping [comprehension question]
I am trying to understand the correct use of »atomic grouping« a.k.a. »independent subexpressions« a.k.a. »non-backtracking subpattern« [this are the terms I found ...
0
votes
0answers
47 views
`find /etc/profile` in GRUB returns “file not found” [closed]
When GRUB loaded at boot, I entered c in the command window, then at the grub > prompt, I tried find /etc/profile. It returned "file not found".
Some other files also failed. However, I can find ...
1
vote
2answers
72 views
cannot mount .img file - “not a directory” error
I try to execute the following command on an ubuntu 12.04 system:
sudo mount minix203.img -o loop -t minix /mnt/myminix/
in order to mount an .img file with minix partition; and get the following ...
1
vote
1answer
39 views
Safely convert unicode strings to printable characters
I have many HTML files containing mixed unicode strings like \303\243 and printable characters like %s. What I'd like to do is converting the unicode strings into printable characters in a safe way.
...
2
votes
2answers
14 views
Start Repl/CLI in Background and Feed Commands
Lets say the python repl takes a long time to start up, is there a way to start it up in the background so I can create an alias and feed it commands like python-current "command to run".
0
votes
2answers
71 views
what is “an invisible whitespace character that takes up space”
One can look up Unicode Characters with Regular Expressions. On Jan Goyvaerts website I found a RegExp whose meaning I don't understand :
\p{Zs} or \p{Space_Separator}: a whitespace character that ...
0
votes
2answers
58 views
'df' command doesn't list /home directory
In the book I am reading, the output of df command is shown like this:
Filesystem 1K-blocks Used Available Use% Mounted on
/dev/sda2 15115452 5012392 9949716 34% /
/dev/sda5 59631908 ...
0
votes
1answer
12 views
Syntax of DISPLAY=:0 unity --replace or DISPLAY=:0 compiz --replace
Why don't the commands have a & between the setting of DISPLAY and running unity or compiz.
I understand that both work (re-starting unity or compiz), but fail to see why are they the way they ...
0
votes
0answers
33 views
Rsync seems to back up files that haven't been opened or changed
I have started using rsync to back some data on my mac to an external HD. It works really well, but I have noticed something odd. Every time I run the command, I get a list of files that haven't been ...
2
votes
2answers
81 views
what is pts/0 and (:0.0) in linux by type who am i
When I type the command:
[root@degeneration Desktop]# who am i
root pts/0 2013-04-12 15:08 (:0.0)
What is pts/0 and what is meant by (:0.0)?
0
votes
1answer
40 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 ...
1
vote
1answer
54 views
Reading from USB serial port under Cygwin
I am actually using Cygwin, but it is my understanding that it responds to Unix commands so hopefully I am in the correct place.
I have an Arduino hooked up via USB to my LapTop for data reading.
I ...
0
votes
1answer
31 views
How to get the Installation path of binary and logic file in Daemon in Arch Linux
I want to know that if i install a daemon service in Arch Linux, then what will be the path of the files that will get install. also which files will be install where.
0
votes
2answers
23 views
can't update with this error messg
I got this message:
not enough free disk space.... The upgrade needs a total of 31.8 M
free space on disk '/boot'. Please free at least an additional 31.8 M
of disk space on '/boot'. Empty ...
3
votes
2answers
85 views
greedy and lazy regular expressions (comprehension question)
I am teaching myself regular expressions, and I got stuck at »greedy« vs. »lazy« repeatings.
What I found out so far is that
»greedy« means that the RegExp ...
0
votes
1answer
30 views
from a laptop with CentOS 6.3 what is the command line to talk mysql server on my pc?
I have CentOS 6.3 running on my laptop which is already connected to the net. I would like to know how to use the MySQL installation on my PC?
I meant :
from a laptop with CentOS 6.3 what is the ...
1
vote
2answers
109 views
Can't remove same folder name twice
I have a folder called - bin , then I remove it by rm bin , re-create it and when I want to remove it again by rm bin the shell promts -
/bin/mv: cannot move `bin/' to ...
2
votes
2answers
72 views
Sending a file as the body of an email
I want a utility that does something like this:
email --subject="xxx" --body=body.txt [email protected]
(using pre-configured sender information for e.g. gmail). Note that body.txt is ...
1
vote
2answers
36 views
How to strip directory structure with command line (or script)
I have a large collection of files packed into a two-level directory structure with many, many, many folders.
In other words, I have a folder with a great many subfolders in it. There are no ...
2
votes
5answers
98 views
Create and open file with one command?
I want to create a text file and open it in a text editor with a single command.
I know touch file.txt creates a file and open file.txt opens the file, but is there a way to do this with a single ...
0
votes
3answers
101 views
Regular Expression for finding double characters in Bash
I am looking for a regular expression that finds all occurences of double characters in a text, a listing, etc. on the command line (Bash).
Main Question: Is there a simple way to look for sequences ...
0
votes
0answers
14 views
Is there any way to copy files which were modified at a particular time? [migrated]
I am using the below command to copy all modified files day-wise:
D:\ws\xcopy *.* /s /D:04-02-2013 D:\new
How can I copy files which are modified at a particular time as well?
6
votes
3answers
218 views
How do you send command line apps directly to the background?
I already know that pressing ctrl+z stops the app, then I can send the app to background with the bg command, but that means there is a brief preiod of time that the app is stopped.
How do I send the ...
2
votes
3answers
169 views
Transparently run wine programs
When I want to run a wine program I have to type e.g.
$ wine ~/.wine/drive_c/Program\ Files/TextAloud/TextAloudMP3.exe
Would it be possible to run directly TextAloudMP3? I mean not only from command ...
13
votes
6answers
736 views
Can a Linux command have capital letter(s)?
Can a Linux command have capital letter(s)? I know it's supported but i want to be sure if it's a "problem" or considered "not a good thing"?
1
vote
1answer
44 views
Unix Date command not working for few servers
I am trying to execute date command in unix server for yesterday. The commands tried are :
date --date ="1 day ago"
date --date ="1 days ago"
date --date ="yesterday
date --date ="-1 day"
These ...
-1
votes
2answers
45 views
Getting cpu usage same every time.
When I execute following command to get cpu usage , I get nice + user cpu usage.
top -b -n1 | grep "Cpu(s)" | awk '{print $2 + $4}'
Output:
14.5
Here I am getting problem is that the output ...
1
vote
2answers
52 views
How to target multiple selections with xclip
When copying text to the clipboard, xclip provides several selection targets:
-selection
specify which X selection to use, options are:
"primary" to use XA_PRIMARY (default),
...
0
votes
1answer
42 views
What is the difference between the whatis and apropos commands?
CentOS 6.3 / RHEL 6.3
Can someone please explain the difference between the whatis command and the apropos command? I noticed that both appear to be installed by default and I'm not sure what the ...
5
votes
3answers
188 views
How do I remove all sub-directories from within a directory?
This question is kind of a phase II to the first question I posted at here
I have a directory that contains a bunch of sub-directories, .zip files, and other random files not contained within a ...
1
vote
2answers
69 views
Cross Unix Command Reference
I am looking for a website that contains a reference between how to do things on the command line in different unix OSs.
I have seen such site before, I am just unable to find it.
I know such site ...
8
votes
5answers
181 views
store command before pressing ctrl+c, revive afterwards [duplicate]
Sometimes I type a lengthy command in my command prompt and then notice that I need to check something before actually pressing return and executing the command. I press ctrl+c, execute the new ...
