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

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2
votes
0answers
110 views

How do I recursively apply default ACLs of a directory to its descendants?

If I have a directory with default ACL entries assigned to it, but some or all of its descendant files and sub-directories have access or default ACLs that do not agree with those defaults, how do I ...
0
votes
0answers
23 views

Help with a bash script [duplicate]

I'm trying to get a script working that will examine two directories and list all of the duplicate files found in both. Looking for duplicates based on content. And then have the script report the ...
0
votes
1answer
75 views

how to find out the name of the server on which the files are hosted on? [closed]

I've tried numerous thing such as uname -a, env, findsmb, amongst other things but that will only give the hostname which is not the server where the files are hosted... I get that there is nfs ...
3
votes
3answers
271 views

Method for storing/remembering one liner commands

Often when configuring and adjusting unix-based systems I use a lot of one-line commands that are difficult to remember. For example, to determine what version of ntp (the time server) is running, you ...
9
votes
4answers
1k views

Windows shell Escape key (delete whole line) equivalent in Bash

In Windows command line (powershell and cmd), when you press Esc key while on a line, whatever you have typed at the prompt is removed. I found that pressing Esc key at bash prompt does nothing. ...
-1
votes
2answers
6k views

How to delete a file in Arch console?

pacman stopped working and asked me to delete a file if "another package manager isn't working". What is the file for deleting files?
3
votes
4answers
6k views

get age of given file

How can I get the age of a given file in, at least, days? I'm well aware of ls -lh and similar commands. I want something that will work sort of like this: getfage <FILE> # prints out '12d' ...
0
votes
2answers
333 views

Add space after 8 characters then add space after every 4 characters

Here is the sample input: AbbigailAbieAbbyAbbi Using sed, I have separated them into 4 characters but seems like I got a problem because I have to separate the first 8 characters first then add ...
0
votes
0answers
51 views

cant edit anything on xampp as sudo user [closed]

I’m new to Linux was an avid Windows user until recently trying on an old system seeing some major differences and converting, so I apologise if this question seems simple. I’m running the latest ...
5
votes
3answers
314 views

I am trying to find a better/easier way to count alphabetic characters in a file or shell variable

I have a file containing the following text: we are going to write something 1 2 3 wc tells me I have 1 line 9 words and 38 characters. I'm looking to count the 26 letters only (a-z, no numbers or ...
1
vote
2answers
349 views

Count how many lines start with which characters

I have a file with a number of lines in a file filename. I want to count how many lines start with character 'a', with 'b' and so on in one go. What command i should execute.?
0
votes
0answers
210 views

Gmail and mutt: msmtp error

Invalid SMTP URL: ssmtp://REDACTED@gmail.com@smtp.gmail.com:465/ I can use mutt to read my Gmail, but when I try to send I get the above message. When I installed mutt a screen came up for postfix ...
0
votes
0answers
14 views

How to maximize and minimize windows from the command line? [duplicate]

Is there any way to send a command to the currently focus window to minimize or maximize? I'd like to be able to control this from a script, or tool bar launch icon.
2
votes
2answers
5k views

Difference between who and whoami commands

The man page description of who command is who - show who is logged on But there exists a similar command whoami. The man page description of whoami is whoami - print effective userid Can anyone ...
3
votes
1answer
69 views

Get a list of applications that are playing sound [closed]

I want to get a list of applications that are currently playing sound (using the sound card). I tried to search on a lot of places but did not succeed. Any method is fine (bash, Java, etc.). I want ...
9
votes
3answers
8k views

How do I grep without leading whitespaces?

I'm greping through a large codebase, and leading whitespaces and tabulation seem to be quite annoying. Is there any way to get rid of it? grep -R "something" ./ E.g, instead of: foo/bar.cpp: ...
1
vote
3answers
643 views

How to display contents of mounted /boot and '/' root partitions?

How to display contents of mounted /boot and '/' root partitions of Debian on SSD drive from Linux Live CD? I know ls -1 to list directory contents, but what is exact steps to get this?
15
votes
5answers
45k views

count lines in a file

I'm sure there are many ways to do this: how can I count the number of lines in a text file? $ <cmd> file.txt 1020 lines
2
votes
2answers
734 views

How to change a firefox option on a quick way (via shortcuts, command line,..)?

In Firefox we have two options at Firefox->Preferences->Preferences->Fonts and colors->Colors menu, Use system colors and Sites can use other colors. I would like keep the first one ...
8
votes
3answers
2k views

How do I take a list and remove it from a file?

I have a long list of domain names that I need to remove from /etc/remotedomains. They're probably not in any particular order in the file. Each domain is on one line. How could I iterate through the ...
0
votes
0answers
27 views

How to modify ENV in Solaris 10 [duplicate]

I wanted to edit the contents of environment when entering this "ENV" in terminal. I googled this but so far none of the solution offered works in my end. The closes solution that i got was to edit ...
4
votes
3answers
542 views

Switching among cli and vim and other files workflow

I saw some kind of workflow in vim: Vim had a file open. Then some combination of keys made vim disappear and the user was in the command line working in cli mode, then opened another file and then ...
7
votes
1answer
713 views

Echo difference between Ubuntu and Red Hat [closed]

I have mostly been experimenting with Ubuntu but recently was using a Red Hat Enterprise system and was surprised at a difference I found setting and displaying environment variables. In Ubuntu I ...
1
vote
2answers
100 views

How to identify user and server with short commands?

I've been teaching my students the basics of the Unix OS (and Linux) for 4 weeks now. I want to give them a home assignment next. It's the first one so the questions and tasks won't be hard. My only ...
0
votes
1answer
1k views

How to determine Apache user from the command-line?

There is a question about the group, but I couldn't find any question/answer for getting the Apache user. Therefore how to determine Apache user from the command-line?
6
votes
7answers
3k views

What is the easiest way to add a string on the beginning of every line of the file from the command line?

I am looking for a way to add some string to the beginning of every line (same string for every line). Not something customizable but rather something that will be easy to remember and available on ...
49
votes
5answers
2k views

cd by just typing the directory's name?

I either had this somewhere 20 years ago or I dreamed about it. Basically: If if type blobblob I get blobblob: command not found Fair enough. I would like it so that when my shell gets those ...
1
vote
2answers
193 views

How to kill all processes for a given user that take longer then X time

When I list processes with ps auxf I often see some that are stuck and I need to manually kill them. How can I do it with one command? Example ps result: $ ps auxf USER PID %CPU %MEM VSZ ...
2
votes
0answers
36 views

Close All Piped Commands if one close

I'm running at least 3 commands (with progs) using pipes. For example program1 bla bla | program2 blabla | program3 bla bla Is possible to close all programX PIDS automatically if at least one ...
1
vote
2answers
2k 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 ...
1
vote
1answer
90 views

Is autocompletion for applications done by shell?

When I type evince, and then hit tab, the bash shell will list all files that can be opened by evince, which seems to be based on the ext part of the filename. Is this done by shell or the ...
1
vote
2answers
315 views

Use awk to find first occurrence

I have a log file that gets updated when my script runs. The script will insert "Start of script" text when it starts and "End of script" text when it finishes running. I am trying to capture the ...
6
votes
7answers
2k views

Linux command line. Move all files and directories in directory, except some files and directories

I have a folder A which has files and directories, I want to move all those files and directories to another folder B, except file, file2, directory, and directory2. How can this be done?
0
votes
0answers
78 views

What does !$ mean exactly? [duplicate]

echo !$ outputs different strings depending on my previous command line call. For example: mrdumbdumb-redhat:~ mrdumbdumb$ ls mrdumbdumb-redhat:~ mrdumbdumb$ echo !$ echo ls ls ...
3
votes
4answers
406 views

How to display the number of lines, words and characters in separate lines?

I want to display the number of lines, words and characters, in a file, in separate lines? I don't know anymore than using wc filename for this.
9
votes
4answers
18k views

How to use ifconfig to show active interface only

By default ifconfig will show me all available interfaces , but what if I just want to display active ones? Like, en0 only in below. en0: ...
3
votes
2answers
165 views

get result text from CLI command

I'm writing a bash script and I need to capture the text resulting from the output of the rsync command, for instance, the following command: rsync -av "$FOLDER1" "$FOLDER2" prints: ... sent ...
8
votes
1answer
475 views

Is there a way to make perl -i not clobber symlinks?

A friend of mine points out that if you do: perl -pi.bak -e 's/foo/bar/' somefile when "somefile" is actually a symlink, perl does just what the docs say it will do: It does this by renaming ...
2
votes
2answers
75 views

How to make an infinitely executing command kill itself when certain conditions are met?

I'm running a command on command line which infinitely generates a certain data and I'm looking for a particular bit of data, so I used grep to find it. As soon as I get the data, I want the command ...
1
vote
1answer
1k views

How do I Nohup an interactive shell-script?

My Script is having 2 command-line arguments and then just couple of questions, after these questions the script will run for itself, I'm able to pass the command-line argument by just doing, ...
3
votes
3answers
165 views

Standard and portable way to send email from console?

What is the most portable or standard way to send an email from the console or a script on Linux, and possibly Unix?
1
vote
3answers
514 views

Execute a file if a command is not found

When I try to execute files in Linux, I'm always annoyed by the need to write ./executablefile instead of just executablefile. I get why it's done, so it won't have an ambigous input, one that is a ...
1
vote
0answers
99 views

How to connect tata photon in X window manager in ubuntu 14.04 using command line

Due to some reason I had to shift from Gnome to X(basic X). So here on the desktop nothing appears (no launcher, no menu bar, nothing) but we can open command line in it using Ctrl+Alt+Tab. (I have ...
0
votes
1answer
50 views

Command line utility to learn bit twiddling hacks

I am currently reading Hacker's Delight and would like to practice as I read through the book. Is there any command line *nix tool to perform binary operations and see output in binary?
1
vote
2answers
117 views

What is the concept hidden behind the term “command”?

I have been using, studying and developing for Linux for quite a few years now, and over time, I have successfully convinced a few people to join the cause, and make the switch to Linux. However, ...
1
vote
4answers
530 views

Why do we use double hyphen in “tar --anchored” and single hyphen in “tar -b”? [duplicate]

Why do we use double hyphen in tar --anchored and single hyphen in tar -b? I mean to say why some command line options have single hyphen (-) while some others have double (--)? Also a git example: ...
10
votes
2answers
2k views

How to replace a symbolic link with a copy of a file it links to?

Having a (single, no batch filesystem processing needed) symlink, what a command line to use to replace it with a copy of the file it links to?
2
votes
4answers
342 views

How to disable a shell keyword?

Using enable builtin command we can disable a shell builtin command, for example echo, as follow: enable -n echo But how can we disable a shell keyword like time? If we try: enable -n time we ...
1
vote
1answer
541 views

Apply recursive chmod to files or folders only

I'd like to apply chmods to files and folders in one line, Basically: chmod 700 ./* -R # but only apply to folders chmod 600 ./* -R # but only apply to files Of course I searched google and read ...
6
votes
3answers
5k views

How to disable beep sound in Linux CentOS 7 command line? [duplicate]

I just installed the basic Linux CentOS 7 (no desktop) and am experimenting with the system. Every time I make a mistake (entering things that the command line doesn't like), the computer beeps and ...