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

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0
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2answers
46 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 ...
-5
votes
1answer
37 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
18 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
304 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 ...
62
votes
3answers
54k 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 ...
9
votes
4answers
3k 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
57 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
56 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.
4
votes
2answers
65 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
59 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 ...
5
votes
1answer
98 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 ...
3
votes
1answer
36 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 ...
2
votes
1answer
40 views

Why does my ls --help not work?

Marias-MacBook-Air:~ marias$ ls --help ls: illegal option -- - usage: ls [-ABCFGHLOPRSTUWabcdefghiklmnopqrstuwx1] [file ...]
0
votes
4answers
63 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 ...] ...
0
votes
2answers
83 views

Using the terminal, what other ways can you delete a file?

Other than rm, what alternative methods will achieve the same result? For example, moving a file to "trash" and securely emptying the trash bin. Or moving the file to /dev/null
5
votes
2answers
8k views

Get common name (CN) from SSL certificate?

I have a SSL CRT file in PEM format. Is there a way that I can extract the common name (CN) from the certificate from the command line?
3
votes
2answers
155 views

change file size format when using stat

The formatting character %s makes stat print the filesize in bytes # stat -c'%A %h %U %G %s %n' /bin/foo -rw-r--r-- 1 root root 45112 /bin/foo ls can be configured to print the byte size number ...
12
votes
6answers
2k views

How to find files with 100% NUL characters in their contents?

What is the Linux command-line command that can identify such files? AFAIK the find command (or grep) can only match a specific string inside the text file. But I want to match whole contents, i.e. ...
7
votes
4answers
25k views

Storing output of command in shell variable [duplicate]

I have an operation using cut that I would like to assign result to a variable var4=echo ztemp.xml |cut -f1 -d '.' I get the error: ztemp.xml is not a command The value of var4 never gets ...
3
votes
7answers
142 views

Printing specific section of a line when a trigger value is present

I'm parsing data in the following format: prop1=value1:prop2=value2:prop3=value3+prop1=value4:prop2=value5 parts of the string are delimited by + properties can appear in any order the desired ...
1
vote
1answer
39 views

How to let openssl respond to http/s get directly from command line while listenning

How can I let the openssl s_server to reply to every http(s) request directly from the command line or the server it self (the server is using centOS)? is that possible? from the -help command for ...
5
votes
3answers
2k views

How can I delete text before a delimiter in Linux

I need to delete text from a line before delimiter. For example: (123434): hello::{apple,orange,mango}. I need to delete text before first :. i.e. (123434). Is there any command in linux to ...
46
votes
5answers
32k 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 ...
1
vote
1answer
1k 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
0answers
36 views

Manual creation of NetworkManager connection file fails (Error: Unknown connection)

Objective: I am trying to set up a 3G connection using NetworkManager 0.9.4 via command line. I have previously succeeded (see this question) by setting up the connection through the nm-applet (GUI in ...
12
votes
6answers
53k views

How can I monitor all outgoing requests/connections from my machine?

My machine is a server so I want to ignore connections being made to my server (e.g. when someone visits my website). I want to see only connections/requests being made by my server to other places. ...
2
votes
2answers
209 views

Installing VBox Guest Additions when there is no X-server

I'm using Virtual Box on my windows 8.1 host machine. I have installed CentOS & Ubuntu in 'Graphical Mode' and had sufficient practice. But now I wanted to switch to 'Command Line Mode" ...
0
votes
0answers
54 views

nmcli connection activation failed

I was able to create a wifi hotspot on my debian 8 install using network tab under gnome settings. I was trying to do the same using nmcli but it always shows $nmcli con up id Hotspot Error: ...
0
votes
1answer
53 views

What's the -alhF flag in ls?

What is the -alhF flag in ls? I can't find it in the man page.
10
votes
5answers
583 views

Combining large amount of files

I have ±10,000 files (res.1 - res.10000) all consisting of one column, and an equal number of rows. What I want is, in essence, simple; merge all files column-wise in a new file final.res. I have ...
3
votes
2answers
2k views

Sort and count number of occurrence of lines

I have Apache logfile, access.log, how to count number of line occurrence in that file? for example the result of cut -f 7 -d ' ' | cut -d '?' -f 1 | tr '[:upper:]' '[:lower:]' is a.php b.php a.php ...
3
votes
9answers
3k views

How to generate a year-quarter date from the command line?

I'm interested in outputting a representation of the current year-quarter, as well as the year-quarter for the previous month. If today is 2012 January 1st, I'd like to get 2012q1 and 2011q4 as ...
2
votes
2answers
61 views

What allows a command to be typed while the previous command is still running in foreground?

Sometimes I have seen when one program (say A) is running in the foreground and printing its output to stdout, I can type another command (say B), and when I press Enter it is run, even though I had ...
1
vote
1answer
44 views

I am attempting to write a bash script to convert hex to base64

I am attempting to do the matasano cryptopals challenges in bash. The first step is here I found this stackexchange thread with a partial solution. printf 49276d2 | xxd -r -p | base64 which ...
4
votes
3answers
124 views

What is the difference between home$ and ~$?

I'm learning Linux, and I'm a little confused right now. In the below screenshot, I was not able to understand the third shortcut of Table 2-1. It says that cd ~user_name will change the working ...
6
votes
1answer
4k views

“Argument list too long”: How do I deal with it, without changing my command?

When I run a command like ls */*/*/*/*.jpg, I get the error -bash: /bin/ls: Argument list too long I know why this happens: it is because there is a kernel limit on the amount of space for ...
1
vote
1answer
34 views

Aliasing a command with special parameters [duplicate]

I would like to have an alias for the following code:- g++ *.cc -o * `pkg-config gtkmm-3.0 --cflags --libs`; but I want that when I enter the alias it should be followed by the file name *.cc and ...
0
votes
1answer
58 views

Delete customers domain extension only (in .csv file)

I have a list of my customers emails and want to remove some that end in .br for example. I would normally do the following command: sed -i '/.br/d' customers.csv But that would also delete a ...
0
votes
0answers
44 views

Pixelated display after run “sensors-detect”

I have a Lenovo y50-17 laptop with Mint linux installed. I started by doing sensors-detect, which I've done on computers in the past. I know I should have stuck with the defaults, but I didn't. ...
6
votes
1answer
96 views

Terminal does not accept pasted or typed lines of more than 1024 characters [duplicate]

When I enter text on stdin in an OS X Terminal, a single line is limited to 1024 characters. For example, cat > /dev/null beeps after I type (or paste) a line longer than this, and refuses to ...
1
vote
2answers
67 views

Copy .txt files in a certain directory

I have an issue in copying my file in my directories. I have .txt and .jpeg files in a lot of directories, and I want to copy only the .txt files according to the directory. For example, I have this: ...
30
votes
5answers
24k 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
1answer
26 views

Generating a long sound file with SOX without actually playing the tone

I know how to play a tone for a specific amount of time using SOX. play -n synth 5 sin 347 I know how to save a tone using SOX. sox -n note.mp3 synth 5 sin 347 Question is : How can I save a ...
6
votes
4answers
662 views

pager program like less, able to repeat top N lines

Is there any way to make less program repeat first line (or first 2 lines) on every displayed page? Is there any other pager program which can do this? This would be a killer-app for database table ...
2
votes
1answer
35 views

How can I change the IP and gateway addresses permanently?

I recently installed Linux Ubuntu 14.04 to my computer. To enable internet connection I needed to change my IP and Gateway address. I did the following as a root user # ifconfig eth0 "my ip address ...
-2
votes
3answers
44 views

Can an argument be passed through the “alias” command? [duplicate]

I want to know if i can pass an argument with an alias command. for example: alias d="dmesg|grep -iw usb|tail -5" Now d will print the last 5 lines. if i want to use d to print a different number ...
15
votes
4answers
25k views

How can I make a program executable from everywhere

What should I do if I want to be able to run a given program regardless of my current directory? Should I create a symbolic link to the program in the /bin folder?
2
votes
3answers
45 views

Manipulate multiple files by inode

I have a large number of files that contain backslashes \ that I would like to manipulate, but whenever I try something like: $ ls -li 2036553851 -rw-rw-r-- 1 user user 6757 May 20 00:10 ...
5
votes
5answers
180 views

Run `grep` excluding a file in a specific path

I want to exclude the file ./test/main.cpp from my search. Here's what I'm seeing: $ grep -r pattern --exclude=./test/main.cpp ./test/main.cpp:pattern ./lib/main.cpp:pattern ./src/main.cpp:pattern ...