The command-line is the interactive interface to your shell.

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4
votes
3answers
1k views

How to tell of whether the kernel parameter [passed at command line] is a valid kernel parameter?

In the grub.conf configuration file I can specify command line parameters that the kernel will use, i.e.: kernel /boot/kernel-3-2-1-gentoo root=/dev/sda1 vga=791 plasticDuck After booting up a ...
16
votes
1answer
18k views

How to display kernel command line parameters?

In the grub.conf configuration file I can specify command line parameters that the kernel will use, i.e.: kernel /boot/kernel-3-2-1-gentoo root=/dev/sda1 vga=791 After booting a given kernel, is ...
28
votes
3answers
30k views

SSH inside SSH fails with “stdin: is not a tty”

I'm trying to connect to machine one with ssh and then connect to another machine two with ssh, but I get this error. ssh user@computerone.com 'ssh otheruser@computertwo.com' stdin: is not a tty ...
2
votes
1answer
3k views

Hold and release CUPS print jobs from command line

Is is possible to hold and release CUPS print jobs from command line? How to do it? I tried cupsenable: sudo cupsenable --release myprinter but it didn't work.
4
votes
1answer
3k views

Connect to hidden Wifi AP with wpa-supplicant?

I have a headless Debian machine, with a Wifi dongle connected. I used to hide the Wifi AP, but now I can't. If I unhide it, some lines in the /etc/network/interfaces will allow me to connect: auto ...
6
votes
1answer
255 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 ...
6
votes
3answers
3k views

What's wrong with these two cron job's?

I have the following cron jobs defined. 55 8 * * 3 /usr/bin/php /home/mark/dev/processes/customClient/events.php > /home/mark/dev/processes/customClient/events-`date +%Y-%m-%d ...
65
votes
12answers
27k views

How to grep a specific line _and_ the first line of a file?

Assuming a simple grep such as: $ psa aux | grep someApp 1000 11634 51.2 0.1 32824 9112 pts/1 SN+ 13:24 7:49 someApp This provides much information, but as the first line of the ps ...
5
votes
3answers
971 views

id3v2 used recursively at command line?

Trying to get my id3 tags cleaned up and am loving id3v2 on the command line -- but I've been using it only with a *.mp3 wildcard and want to explore if there's a way to use it recursively so I can ...
12
votes
2answers
12k views

Is there a simple command for outputting tab-delimited columns in bash?

E.g. I have a file (produced with echo -e "var1\tvar2\t\var3\tvar4" > foo) that are output (in bash): $ cat foo case elems meshing nlsys uniform 2350 0.076662 2.78 non-conformal ...
16
votes
1answer
5k views

How do we specify multiple ignore patterns for `tree` command?

I need to print the directory structure of our production system and I would like to remove some specific directories from the tree? How do we specify multiple ignore patterns for tree command?
0
votes
2answers
527 views

source script as command [closed]

For some reason (?), often when I write scripts nowadays they do not work, or work only in part, and then I try with . or source and they work perfectly. I'm unsure what is causing this as the scripts ...
2
votes
1answer
166 views

How to put “glue” CWD (etc.) to part of the screen instead of putting into PS1?

I suspect there’s some terminology for this question that I’m not aware of. It’s hard to check if a question has already been answered if one doesn’t know the proper vocabulary. So, sorry if this is ...
4
votes
3answers
578 views

Use command grep and locate

How I can make the grep command locate certain words in the files specified by the routes found by the locate command? locate my.cnf | grep user (I want that grep command search the word "user" ...
1
vote
1answer
80 views

Rebooting makes me lose my password-less keys on other machines

When I reboot my machine (as I did today) I seem to lose some functionality, specifically my previous ssh keys that I had copied over to other machines that had allowed me to login without a password ...
9
votes
4answers
7k views

Find only destination of symlink

For use in a shell-script, I'm looking for a commandline-way to get the destination of a symbolic link. The closest I've come so far is stat -N src, which outputs src -> dst. Of course I could ...
2
votes
2answers
706 views

Putting Linux processes on certain CPU cores [duplicate]

Possible Duplicate: How can I set the processor affinity of a process on Linux? Computer CPUs have many cores insde them nowadays. I have always wondered if there is a way to, when I start ...
3
votes
5answers
2k views

Need to grep file with specific letter and move to another folder linux

I need to select files which contain "Error" or "traffic" in their names, e.g. abc_ERRor.csv raError.csv bsn_Error.csv bbbctraffic.csv ccc_traffic.csv ... and move them into corresponding ...
0
votes
2answers
252 views

Total RAM used by a program with `ps`? [duplicate]

Possible Duplicate: Measuring RAM usage of a program I am trying to use ps to benchmark a program, I'm just not sure which flags to use. I would like to get the amount of RAM the program ...
4
votes
1answer
119 views

Can I force myself to enter a password when run certain processes?

I frequently work in an environment where, lets call them "pranksters" may gain access to my console. I am diligent in locking my screen whenever I walk away, but given enough time someone gets the ...
2
votes
1answer
837 views

Regarding generating intersection and union of two csv files

I have two csv files, there are some overlap columns between these two files. Assume one file is called as A.csv and another is called as B.csv. The intersection of A and B is called as C. I would ...
4
votes
1answer
16k views

access external hard drive to delete folder on terminal Mac

I want to delete a folder of portable hard drive on terminal in Mac. Are there any command line ?
3
votes
2answers
699 views

Urxvt draws lines slowly

I'm using Arch Linux and Urxvt as terminal emulator. When I scroll up/down, text lines gets rendered so slow I can count by top to bottom (heh, 1st line get rendered... ohh, 2nd one! ...). It takes ...
5
votes
2answers
5k views

CentOS: Install packages listed in a text file?

I have an existing CentOS installation which I'd like to install extra packages to. The packages to be installed were supplied to me in a list, one package per line, which looks like: .... ...
3
votes
1answer
525 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 ...
3
votes
3answers
744 views

Fastest way to open all files in a directory with multiple file extensions on commandline

If I want to open all mp4 files in a directory, I can simply do something like totem *.mp4. But how can I open all mp4 and all flv files in that directory with one command. I.e. I want to do something ...
6
votes
1answer
1k 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?
22
votes
4answers
14k views

How to Execute multiple command using nohup

I want to execute multiple command using nohup, And each command should execute after previous command, I used this command for example: nohup wget $url && wget $url2 > /dev/null ...
2
votes
1answer
251 views

Standard command line syntax ambigiuty in interpretation rules?

This question is somewhat similar to this: Unix/Linux command syntax Suppose I have a program foo that takes arguments -a and -b. If both a and b take a string argument what is the meaning of this ...
9
votes
3answers
362 views

How can my script know when I'm in a virtual console vs. an xterm?

A few of my scripts (keymap changing, public key adding) need to act differently when in a virtual console vs. in an xterm. What's the real code for #!/bin/ksh if [[ in_a_virtual_console ]]; then ...
4
votes
3answers
3k views

Automate login with sudo and su

I know the security risks, but I am performing this experiment/exercise on an old, seldom used *nix machine I have laying around the house. So doing this exercise will not bring any security risk to ...
2
votes
2answers
2k 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 ...
1
vote
2answers
539 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 ...
67
votes
4answers
57k views

How to tell gzip to keep original file?

I would like to compress a text file using gzip command line tool while keeping the original file. By default running the following command gzip file.txt results in modifying this file and renaming ...
1
vote
1answer
810 views

Have netstat not display port numbers for foreign address

I would like to get netstat to not display port numbers on the foreign address so I can run some statistics on it. This is for a FreeBSD system. The following is a example of the output. ...
3
votes
2answers
1k views

How do I get this find and rename command to work with subdirectories? [duplicate]

Possible Duplicate: Recursive rename files and directories I have a large directory of music files that is often changing as files and directories come and go. My preference is to make sure ...
5
votes
2answers
660 views

Is there a way to retrieve the name of the Desktop Environment?

The title is quite exhaustive: is there a way to retrieve the desktop environment name (e.g. Gnome, Unity, XFCE, LXDE, KDE...) from the command line or using Python?
2
votes
0answers
185 views

How to emulate a KWin effect by command line?

I would like to apply the Toogle Invert Effect when I start my system. So, I need to know how to call this KWin effect using the terminal. OBS.: I'd tried xte "keydown Meta_L" "key i" "keyup ...
8
votes
5answers
2k views

Read and confirm shell script before piping from curl to sh (curl -s [url] | sh)

Whenever I have to execute a shell script from the web curl -s [url] | sh, I first open url in my web browser to make sure the script isn't malicious and is safe to run. I remember seeing a command ...
8
votes
4answers
890 views

Understanding different Linux Distros

I'm having a little bit of confusion when understanding linux based OS's. When I download the newest version of Mint and Ubuntu, aren't they the "same" at their core (kernel)? It just seems that they ...
7
votes
2answers
1k views

Cisco-like command Line Interface

I'm looking for a way to implement a fairly basic Cisco like command line interface on my Ubuntu server appliance (12.04 in particular). I've come across the following project: CLISH however, ...
5
votes
1answer
2k views

Send a command from the console to a running X server

Is it possible to send a command from the console, say tty1, to the terminal currently occupied with X (in my case tty7 as I use Debian), to tell for example mplayer to play a movie? Edit - made a ...
2
votes
2answers
4k views

Merge multiple flv files?

What tool in Linux can I use to merge multiple flv files ? Files are already in order, just put them altogether seamlessly
9
votes
2answers
15k views

Locate and delete all temporary files in user directory

I use vim a lot, and my area has power failure a lot. So the resultant is I get many *.swp files scattered over my PC. I want an alias of rm command that removes all files with either .swp, ~, ...
9
votes
3answers
502 views

How to `locate` multiple files and open them in vim?

Suppose that I have a file named filename123.txt and it is the single file that is named so, and I can locate it with the command locate filename123. And it returns only this file. Now I want to open ...
5
votes
1answer
683 views

How can I control an existing remote shell?

On my remote machine, an xterm/shell has been created (by another process). I have full access to that shell through VNC. But really I would like to be using a text mode shell on my local machine. ...
2
votes
2answers
557 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
2answers
278 views

List all users and last time they read mail, pipeing to multiple output

I have one system that I would like to do a little clean up, so I would like to get all user accounts and last date they accessed they mail. It is a Debian system. So far I got to this: cut -d: -f1 ...
2
votes
1answer
165 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/*" ...
8
votes
4answers
59k views

How do I exit or cancel a bad bash command?

I expect to get some flak for this, but I can't find the answer anywhere. It seems like it should be so obvious. Sometimes, when I type a bad command in a bash terminal, the cursor just jumps down to ...