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

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1
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0answers
41 views

osx - dd command behaving weirdly [duplicate]

I've been using dd for a couple of years now, most of the time successfully. I usually use it to dd Linux images to USB drives. My workflow doing so is as such: convert .iso image to a .img format ...
0
votes
1answer
213 views

Open a webpage and enter a username and password via CLI

Ultimately, I want to use a bash script to automatically open and log into a website. I was wondering if I could use the curl or elinks commands to log in to a website and then somehow export that ...
117
votes
9answers
42k views

How do I delete a file whose name begins with “-” (hyphen a.k.a. dash or minus)?

How do you remove a file whose filename begins with a dash (hyphen or minus) -? I'm ssh'd into a remote OSX server and I have this file in my directory: tohru:~ $ ls -l total 8 -rw-r--r-- 1 me ...
6
votes
2answers
484 views

Why does the terminal echo keystrokes when commands are running?

I was recently running tail -f on a log file of a server that was running, trying to diagnose a bug, when I accidentally bumped the keyboard and typed some characters. They got mixed in with the ...
-2
votes
1answer
205 views

Get CIDR of my IP on the WAN

I have a script that updates some remote systems with my laptop's IP and CIDR on the WAN, how the Internet sees me, in other words. I use the following to get my IP on the WAN in bash: dig +short ...
5
votes
1answer
1k views

What's the difference between \b and \< in the grep command

In the man page of grep, I see The symbols \< and \> respectively match the empty string at the beginning and end of a word. The symbol \b matches the empty string at the edge of a ...
3
votes
8answers
4k views

grepping dotfiles with -R correctly?

From time to time I need to find a culprit in an unknown dotfile and instead of trying to figure out which package is to be blamed (e.g. xfce4 or thunar?) and what is their naming convention (.app vs ...
2
votes
4answers
533 views

What is the difference between (cp f1.txt f2.txt) & (less f1.txt > f2.txt) [duplicate]

I know that both will copy data from f1.txt to f2.txt, but what is the real difference? (cp f1.txt f2.txt) vs: (less f1.txt > f2.txt)
0
votes
0answers
80 views

Download Hotlinked Images from Forum from Command Line

From the command line, is it possible to download linked images posted on forums? I want to enter the forum thread url and maybe stipulate which image hosts to detect. Also some threads will have ...
3
votes
4answers
24k views

How to send many commands to shell and wait for the command behind ends

Hello I have around 20 commands and I have to send all of this to Unix shell, and copy the result, but I don't know how to do it. I am not sure about what shell I have, because it is a small program ...
0
votes
3answers
51 views

how to show port numbers that are listening for the incoming connections under TCPv4?

I want to use command line to show only the port numbers after ":" only This is what I'm trying to do sudo netstat -ant |grep LISTEN|grep :|sort -n|cut -c 45- It shouldn't list any tcp6 info
26
votes
2answers
24k views

How to grep the output of cURL?

I need to retrieve the expiry date of an SSL cert. The curl application does provide this information: $ curl -v https://google.com/ * Hostname was NOT found in DNS cache * Trying ...
0
votes
1answer
210 views

Set the active tmux tab color

Is it possible to change the background of the active (current) tmux tab? I'm using tmux 1.9 on Ubuntu 15.04. $ tmux -V tmux 1.9 I tried to do: set-option -g pane-active-border-fg red But the ...
1
vote
1answer
59 views

How can I cache the PGP unlock for unix pass when I am in the virtual terminal?

When I am running in the GUI, if I run the pass command to read a password such as pass -c Email/FooBar, a password prompt will appear for my passphrase. If I type my password, my password will be ...
-1
votes
1answer
1k views

How to recover the deleted file from linux system? [duplicate]

I am using centos7 locally. Mistaken I deleted text file(keystone.conf.disabled) using rm, from /etc/httpd/conf.d directory, How to recover this file. This file is very important to me. Please help ...
1
vote
1answer
40 views

Bad ID3 tags when transfering mp3 to another device

I created mp3 files in Linux with mp3wrap application and then I applied ID3 tags on it as follows $ for i in *.mp3; do mp3info -t ${i%.*} -l yes1 -a yes $i; done When I look at particular mp3 file ...
2
votes
2answers
69 views

In find -perm, what's the difference between “+6000” and “/6000”?

I'm trying to find all the setuid/setgid binaries on my system. I've found two different ways to do this online. What's the difference between find / -perm +6000 -type f and find / -perm /6000 ...
9
votes
4answers
10k views

How to perform grep on FTP?

I tried searching for similar command in ncftp (actually this is the only terminal ftp client I used) and I didn't find it. What's the way (if possible at all) to use grep command on remote server, ...
0
votes
1answer
115 views

Describe the prompt I see when I first logged into the Linux computer

Can you please describe and explain each part of the command prompt pi@raspberrypi ~ $ This is what I saw when I first logged in to my Linux computer.
0
votes
0answers
30 views

What is the difference between “. ./command” and just “./command”? [duplicate]

I know that you do "./command" to signify to look in the current folder for the name of the executable . . . but why do you need to do "dot space dot slash command" sometimes? Like, when you are ...
0
votes
2answers
222 views

How do I add Metasploit into my PATH variable?

I have Metasploit installed on my Mac in /usr/local/share/msf. Everytime I want to use it I have to cd into that directory and use msfconsole. If I try to /usr/local/share/msf/msfconsole in my home ...
-3
votes
1answer
345 views

What command would I issue in order to complete this question?

So I have tried over 10 different attempts and I'm just stumped Here are two inverted-tree diagrams. Issue a command to change the left diagram to the right diagram. Assume that you are in your home ...
1
vote
1answer
98 views

How to write data one by one from tmp files to the final output file using for loop?

I have two tmp files named tmp1 and tmp2 which contains some lines. tmp1 file, 1c\ datafile no. 23 2c\ datafile is ok tmp2 file, 3c\ datafile no. 24 4c\ datafile is ok I have a ...
0
votes
1answer
1k views

Sending files over Samba with command line

I was wondering if there is a way to use Samba to send items to a client machine via the command line (I need to send the files from the Samba server). I know I could always use scp but first I was ...
1
vote
1answer
55 views

Running a program and providing input

I have a program that runs from the command line. As soon as it runs, it asks for a text value and expects the return key to be pressed after that. Is that possible to create a bash script that runs ...
-2
votes
1answer
31 views

Copying all same files to one location and changing the file name to subdirectory_filename

I have conf.yml files in different folders as below. /var/loyalty-badge/conf/conf.yml /var/loyalty-level/conf/conf.yml /var/promotion/conf/conf.yml /var/featured/conf/conf.yml Now I want all the ...
1
vote
0answers
110 views

Disable the Gnome screensaver from the command line

I would like to disable the screensaver on Centos 6.2 for a single user. I have tried from the GUI, that looked like the easiest way, but it didn't work out, I am not sure why. I am looking for an ...
0
votes
1answer
579 views

How to capture the output of the strings command? [duplicate]

How do I capture the output of the strings command into a .txt file from the command line?
1
vote
2answers
132 views

Count frequency of specific numbers in a text file of scientific notations

Background I have a text file, named blood_conc.txt as shown: 0, 0, 0, 0, 0, 0, 0, 1.32006590271e-05, 1.990014992001e-05, 1.504668143682e-05, 2.176900659261e-06, 7.673488970859e-06, ...
1
vote
1answer
62 views

Sorting in reverse numeric order on subfield in a multi-field sort

I'm trying to use GNU sort on a directory/file listing, eg (subset of much longer listing): exams2008/Zoology/Summer/ZY4019Sum08.pdf exams2009/Zoology/Summer/ZY4019.pdf ...
2
votes
2answers
76 views

What is the technical term for command line application environment programs?

Some programs that are run in the terminal, after calling them, switch the command line to their own environment, like "R" (statistical program language) or "GHCi" (interactive Haskell). What is ...
2
votes
1answer
182 views

Is it possible to track bash commands in real time?

I'd like to know if I can track commands entered by user in a bash shell, in real time. What I'm trying to do is something similar to thefuck, but I need to prompt the user as and when he enters new ...
3
votes
0answers
171 views

Replace a image in a PDF using command line

I need to process some PDF files. The task consists in exchange a given image file by another. My first problem is how to replace a PDF image from command line in a batch process. Next I'll try to ...
10
votes
2answers
841 views

Open a .raw file as text in less

The output of my program has a .raw file extension. If I try to open this with less I get: No isoinfo available Install mkisofs to view ISO images The file isn't an image file, it's just text. Is ...
16
votes
6answers
5k views

How do I recursively check permissions in reverse?

There's a command, I think it comes with apache, or is somehow related to it, that checks permissions, all the way down. So if I have /home/foo/bar/baz it will tell me what the permissions are for ...
0
votes
2answers
584 views

sponge from moreutils - what's the difference to shell redirect? useful examples?

> brew install moreutils ==> Downloading https://homebrew.bintray.com/bottles/moreutils-0.55.yosemite.bottle.tar.gz ...
6
votes
5answers
25k views

How to pass each line of a text file as an argument to a command?

I'm looking to write a script that takes a .txt filename as an argument, reads the file line by line, and passes each line to a command. For example, it runs command --option "LINE 1", then command ...
0
votes
2answers
56 views

What are the steps of this command using ; || and && [duplicate]

Note: A B C are commands..... Please tell me what the step process would be of these commands, so I can better understand the language.. A || B ; C = If A fails then run B then C? A ; B || C = Run A ...
-8
votes
1answer
114 views

Find Command: display the file numbers [closed]

I have a couple of questions about the find command. How to show how many files and directories(only the result numbers) within the /var directory (and below) are owned by someone other than you or ...
1
vote
3answers
2k 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
0answers
69 views

List partition type GUID's for all disks from command line?

I need to list the partition type GUID's from the command line. Note: This is not the same as the partition UUID. Basically I'm needing to search for all disks that have the Ceph OSD type GUID: ...
5
votes
7answers
459 views

Is there an equivalent way to remember directories on mounted volumes like DOS

A while ago, I moved from a purely Windows environment to using Windows and a Mac. Whilst I am slowly getting used to my Mac and loving it, there are a few things that frustrate me. One of them is ...
9
votes
4answers
6k views

Local, timestamped logging of all ssh commands?

How can I keep a local, timestamped record of all remote commands I use in ssh (command-line openssh client started through bash)? Requirements: Essential: 100% client-side without relying on ...
1
vote
2answers
257 views

What does -ar flag mean for cp?

What does -ar flag mean here: cp -ar ../foo/bar/. qux/quux/ I'm quite new to command line languages and trying my best to learn it. Not sure of the -ar flag only. -r is recursive right, then can ...
0
votes
1answer
67 views

Are cp -r and cp -R the same? [duplicate]

A tutorial shows cp -r http://cli.learncodethehardway.org/book/ex10.html but http://ss64.com/osx/ only shows -R.
5
votes
2answers
909 views

Mac OS X how to verify particular packages are installed

In a BASH script I need to check if gcc, g++, cpp, make, libpng devel, zlib devel, git, Java (including devel files), ant and pkg-config are available on Mac OS X and if not, I need to prompt user to ...
2
votes
1answer
302 views

Using mailx without storing a password

I'm trying to setup mailx to use my Gmail account. I've found a configuration that can send mail successfully but it requires me to store my email password in a configuration file in my home ...
6
votes
1answer
450 views

Bash: “history number” vs “command number”

While Googling how to customize my shell prompt via the PS1 variable, I'm seeing tables of special characters that can be used. In particular: \! the history number of this command ...
4
votes
1answer
132 views

Spelling mistakes in the file?

I have a file with spelling mistakes in it. It has a lot of mistakes I need to find all mistakes and correct them. I used : spell [filename] it shows me spelling mistakes thiis iz wurse ... and ...
0
votes
4answers
112 views

Why does my “ls -a-l /home” not work?

Marias-MacBook-Air:~ mariasharapova$ ls -a /home . .. Marias-MacBook-Air:~ mariasharapova$ ls -a-1 /home ls: illegal option -- - usage: ls [-ABCFGHLOPRSTUWabcdefghiklmnopqrstuwx1] [file ...] ...