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

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0
votes
2answers
29 views

What is background and Foreground processes in Jobs

I'm studying Redhat Linux 7, topic Monitoring and managing Linux processes in it I understand Processess and its command. But I do not understand "Controlling Jobs" and Running jobs in the background ...
3
votes
0answers
27 views

Multiple wget calls in a single session?

I have the following code to retrieve a page from a website that needs authentication (it uses Sungard Higher Education authentication): wget --delete-after --save-cookies cookies.txt ...
19
votes
4answers
17k views

Usage of dash (-) in place of a filename

For a command, if using - as an argument in place of a file name will mean STDIN or STDOUT. But in this example, it creates a file with the name -: echo hello > - How can I make - in this ...
3
votes
0answers
16 views

Create torrent with files from different directories from CLI

I have a directory structure that looks like: dirA fileA1 fileA2 ... dirB fileB1 fileB2 ... I would like to create a torrent using CLI utilities that contains: dirA/fileA1 ...
2
votes
1answer
173 views

convert WAV music library to FLAC on command line and achieve best quality

I would like to produce (nearly) perfect FLAC files by verifying/checking all conversion steps. I'm hoping to do this in a single command, although a short bash script would be acceptable as a second ...
0
votes
0answers
17 views

Is there a large performance difference between find and find2perl

Is there a performance difference between find and find2perl? I work for a hosting company and I was told that our admins prefer us to use find2perl over find. Supposedly this is because find is ...
0
votes
0answers
7 views

Are gconftool-2 and gconf-editor completely unrelated?

I used to use gconftool-2 to edit keys in this way (here I change the cursor shape in gnome-terminal): gconftool --type string --set /apps/gnome-terminal/profiles/Profile0/cursor_shape ibeam This ...
2
votes
1answer
550 views

How do I decrypt a message using openssl's CLI?

I have a message, I know the password and the cipher that was used to encrypt it, but I can't figure out how to ask openssl to decrypt it. I see the cipher in the output from the ciphers command, and ...
2
votes
2answers
2k views

Try to disable console output, console=null doesn't work

as mentioned above, I want to to completely turn off the console output, but putting console= or console=null in the kernel command line doesn't change a thing. When I enque quiet to the kernel ...
24
votes
5answers
8k views

How do I split a flac with a cue?

I've got a full album flac, and a cue file for it. How can I split this into a flac per track. I'm a KDE user, so I would prefer a KDE/QT way, I would like to see command line and other gui answer's ...
1
vote
1answer
957 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 ...
37
votes
5answers
20k views

How can I send stdout to multiple commands?

There are some commands which filter or act on input, and then pass it along as output, I think usually to stdout - but some commands will just take the stdin and do whatever they do with it, and ...
15
votes
4answers
19k views

What's the best way to join files again after splitting them?

If I have a large file and need to split it into 100 megabyte chunks I will do split -b 100m myImage.iso That usually give me something like xaa xab xac xad And to get them back together I have ...
1
vote
1answer
51 views

Invalid back reference using grep

So I am trying to find 6-letter words that consist of one character repeated three times followed by another character repeated three times. For example aaabbb or oookkk. I am trying: grep -E ...
1
vote
1answer
15 views

How do I make an alias to substitute single word in a piped command? [duplicate]

I use aliases a lot but right now only for use cases like alias i='sudo apt-get install -y'. I often would like to add an alias in the following form: alias cmd='echo [something] >> ...
19
votes
5answers
10k views

Filtering invalid utf8

I have a text file in an unknown or mixed encoding. I want to see the lines that contain a byte sequence that is not valid UTF-8 (by piping the text file into some program). Equivalently, I want to ...
16
votes
3answers
5k views
+50

how to download a file using just bash and nothing else (no curl, wget, perl, etc.)

I have a minimal headless *nix which does not have any command line utilities for downloading files (e.g. no curl, wget, etc). I only have bash. How can I download a file? Ideally, I would like a ...
4
votes
1answer
112 views

Untar a specifc folder within tar.gz

How do I untar/uncompress a specific folder within a tar.gz using the terminal/commandline (Ubuntu 14.04 (Trusty Tahr))? Precise: -file.tar.gz -- folder1 -- folder2 How to extract... ... ...
3
votes
2answers
476 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 ...
15
votes
5answers
37k views

How to stop a background process?

I have started a wget on remote machine in background using &. Suddenly it stops downloading. I want to stop its process, then start it again. How can I stop it? I haven't close its shell window. ...
19
votes
6answers
24k views

How can I get a count of files in a directory using the command line?

I have a directory with a large number of files. I don't see a ls switch to provide the count. Is there some command line magic to get a count of files?
2
votes
2answers
1k views

Linux empty buffer cache command permission denied

I'm using the following commands to flush cache: # sync; echo 3 > /proc/sys/vm/drop_caches # sync; echo 2 > /proc/sys/vm/drop_caches # sync; echo 1 > /proc/sys/vm/drop_caches When I use ...
0
votes
0answers
14 views

ipmitool set idrac mode

I have a DELL server R610, on this server there is a RHEL 6.4 This server has an idrac entreprise. I would like to configure the idrac from command line, avoiding reboot. I read on the man page of ...
1
vote
4answers
2k views

Fast tool to generate thumbnail video galleries for command line

I use gframecatcher to generate thumbnail video galleries, i.e. something like this: However this is a GUI tool and I want to create recursively a gallery for every video in a directory structure, ...
28
votes
7answers
169k views

How do I zip/unzip on the unix command line?

How can I create and extract zip archives from the command line?
0
votes
1answer
31 views

Remove a folder with the same name as an environment variable

I was messing around with a log4j properties file and accidently made a folder with the following text ${foo} however I also have an environment variable named foo that points to a folder so thus if I ...
9
votes
3answers
7k views

Refresh/reload active browser tab from command line?

I'm trying to set up a custom toolchain where the browser (Firefox or, preferrably, Chrome) is often/frequently/constantly forced to refresh from the commandline. (The idea is to instantly see the ...
1
vote
3answers
965 views

Unzipping a batch of files

When I try unzip filename.zip it works. However, I need to unzip a series of zip files. Why are: find . -name "*.zip" -print0 | xargs -0 unzip or ls *.zip | xargs unzip not working? In ...
11
votes
3answers
8k 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 ...
1
vote
1answer
500 views

Why is my mmv command not overwriting the files?

I have a batch file that, among other things, uses the command mmv to rename some files. The relevant line is like this: mmv "$BASEDIR/files/*.txt" "$BASEDIR/files/#1.strings" In essence it works, ...
0
votes
1answer
1k views

Proper escaping of double quotations for curl post data?

I'm trying to test out a server, by sending it JSON data and reading the response. I need to POST data like {"item":"value with spaces"} but when I use curl I find that it sends the backslashes as ...
8
votes
5answers
8k views

Is there a simple linux command that will tell me what my display manager is?

Is there a simple linux command that will tell me what my display manager is? I'm using Xfce. Are different desktop environments usually affiliated with different display managers?
1
vote
5answers
211 views

Is there a difference between ./script and bash script?

Given a shell script file that begins as #!/bin/bash # (bash script here), and has been chmod +xed, is there any difference in running ./script and bash script from the command-line?
4
votes
2answers
44 views

Unzip source arguments

To copy a bunch of zip files from one location to another: $ cp *.zip destination/ To unzip a bunch of zip files to a directory: $ unzip \*.zip -d destination/ man unzip says: The backslash ...
1
vote
2answers
3k views

wget to get all the files in a directory only returns index.html

I'm new to using bash, and I have been trying to wget all the files from a website to the server I have been working on. However all I'm getting back is an index.html file. I let it run for 15 minutes ...
167
votes
23answers
99k views

Repeat a Unix command every x seconds forever

There's a builtin Unix command repeat whose first argument is the number of times to repeat a command, where the command (with any arguments) is specified by the remaining arguments to repeat. For ...
-3
votes
1answer
54 views

If statement to compare files

I need to make an if statement that: compares the files finds the differences between them gets a word count of both files pastes the information from one file to another But I do not know if I'm ...
14
votes
3answers
6k views

How do I find the window dimensions and position accurately including decorations?

I've been trying to figure out the size of a window for use in a small script. My current technique is using wmctrl -lG to find out the dimensions. However, the problem is this: The x and y figures ...
7
votes
2answers
6k views

Samba mount with password prompt as non-root user

I want to mount a password-protected SMB share (served by a Windows machine). The share is protected by a user name and password, and I may not write the password in a file, I want to be prompted for ...
1
vote
1answer
31 views

Is there a console command that replicates Alt+[F1..F10] to change terminal?

Hi I'm a Linux noob developing a custom embedded barebones distro. I have console access over serial to my machine. I would like to control what tty my user sees on their framebuffer. Currently the ...
5
votes
1answer
30k views

Sending messages to another user

Is there any command to send messages through the Linux shell to other people on the same network? I'm using write user and then write the message itself. But there's any command that doesn't show my ...
1
vote
2answers
47 views

Extracting list of patterns which are output of another command

I can extract list of patterns using following command, fgrep -A 1 -f patternlist.txt filename.fasta but, is there a way I can extract without creating another file (patternlist.txt in this case) ...
6
votes
3answers
284 views

find all end subdirectories in a tree

given the following structure: oz123@debian:~/ $ tree . . ├── a │ ├── a1 │ ├── a2 │ └── a3 ├── a1 │ ├── a11 │ ├── a12 │ └── a31 ├── b │ └── b1 │ ├── b11 │ │ └── b21 │ ...
39
votes
8answers
27k views

How can I edit multiple files in VIM?

I know I can open multiple files with vim by doing something like vim 2011-12*.log, but how can I switch between files and close the files one at a time? Also, how can I tell the file name of the ...
1
vote
1answer
415 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 ...
0
votes
1answer
40 views

Syntactic differences in cp -r and how to overcome them

Let's say we are in a blank directory. Then, the following commands: mkdir dir1 cp -r dir1 dir2 Yield two (blank) directories, dir1 and dir2, where dir2 has been created as a copy of dir1. ...
1
vote
1answer
63 views

Is it possible to attach `kinit` to the first attempt to `ssh` without a Kerberos ticket?

My university uses Kerberos-based authentication for login to our unix servers. One way to get passwordless login is to run kinit, type my password, and then run ssh@host. For this setup, I do the ...
1
vote
0answers
24 views

How the /etc/passwd file is accessed by passwd command [duplicate]

My question is we are the normal user. We can't access the file which we didn't have the permission. We are executing the passwd command then how that command is able to access that file. We are ...
0
votes
1answer
58 views

Diff: slightly different filenames, same file

I'm using diff -rq to compare directories on a Mac OS X 10.6 server. In folder1, we have 'filename'. In folder2, we have'filename.archive' because folder2 is created by a file sync app that also ...
4
votes
1answer
580 views

Check ping statistics without stopping

Is there a way to tell ping to show its usual termination statistics without stopping the execution? For instance, I'd like to quickly view: --- 8.8.8.8 ping statistics --- 2410 packets transmitted, ...