One or a set of directives issued in the *nix environment to get information, change the state of something or to execute something. In other words: To gain an objective.

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3answers
67 views

How to get the Serial Number of a disk by corresponding file in linux?

I know that for a disk in linux, we can use commands such as hdparm or smartctl to get its basic information. But for the implementation of these commands, I think all of them are implemented by ...
3
votes
1answer
196 views

Is there a way to know how much memory Linux Os is using?

I am looking for a way to know the size of the memory that Linux os is using (I'm not worried about the other applications memory size). I am using Ubuntu distribution (Ubuntu 15.10). Thanks for your ...
-5
votes
1answer
1k views

Head and tail command

How can i do this exercise in unix? Create the following command: lshead.bash – list the first few lines of every file in a directory specified by the argument. This command should also allow options ...
0
votes
1answer
37 views

Unix addition script

Im currently trying to make a addition command in unix and have come up with the following code: #! /bin/bash #! Add - adds two given numbers together and displays the result "$num1" = $1 "$num2" = ...
1
vote
1answer
39 views

auditctl comm vs. exe

I was looking at Linux audit reports. Here is a log from ausearch. time->Mon Nov 23 12:30:30 2015 type=PROCTITLE msg=audit(1448281830.422:222556): proctitle=6D616E006175736561726368 ...
0
votes
2answers
78 views

How to execute shell command produced using echo and sed?

I have tried doing: echo " mv /server/today/logfile1 /nfs/logs/ && gzip /nfs/logs/logfile1" | sed 's|logfile1|logfile2|g' It printed: mv /server/today/logfile2 /nfs/logs/ && gzip ...
0
votes
1answer
114 views

Use aliases as custom commands in terminator

I am using a terminator layout to start multiple terminals, and would like to call an alias at each terminal start which is defined in my .bash_aliases (called by both .bashrc and .profile). ...
0
votes
3answers
72 views

Apply a command to all subdirectories/files

In a parent directory, I have several sub-directories, each of them contain one or more space-delimited text files. I have the following command that outputs what I want, but only for an individual ...
0
votes
1answer
68 views

picocom -b 115200 - Why do you need to specify the baudrate?

I have an intel galileo board and if I try to connect to it from my laptop with: picocom /dev/ttyUSB0 I get just akward characters like: Terminal ready � ...
0
votes
1answer
59 views

how to save data in terminal as a spreadsheet file

I am a beginner to Linux. I am using this command bzgrep "1675391601497" ts3events.csv.bz2 | less which pulls up a bunch of data separated by commas. I would like to save them as a spreadsheet. what ...
1
vote
3answers
42 views

How to control pathing when executing a string command using bash -c?

Background, I am trying to use a Python library that spawns a subprocess using arguments ["bash", "-c", "python someScript.py"]. What's happening is Python 2.6 is executed, but I want python2.7 ...
1
vote
2answers
124 views

Why is a2p (Awk to Perl translator) installed by default? Why would I want to convert Awk to Perl? [closed]

I am surprised to see the a2p utility installed by default in my Linux distribution. a2p is a command line utility that converts an Awk program from standard input to a perl program that it outputs ...
0
votes
0answers
19 views

Piped sequence - printing

I need to write a piped sequence of commands that prints out a list of all sub directories of a current directory. In order to get all sub directories of a current directory I use: ls -D Since I am ...
0
votes
1answer
15 views

Are programs able to access read-only files?

For example, I am accessing a computer cluster through SSH, and I am running a Matlab program to take in data and then write to a text file. The problem is, the data is read only. So am I still able ...
7
votes
4answers
289 views

Execute a command where a file is found

How do I execute a command where a file is found? Consider I've an directory named testdir that contains the following: $ ls -R testdir/ testdir/: dir1 dir2 dir3 dir4 dir5 testdir/dir1: doc1.pdf ...
1
vote
2answers
28 views

which unix commands for monitoring disk operating are available?

To do some tests on SSD disk, I need to monitor operations such as number of reads and writes, access timestamp, which address accessed, write policy and so on. I know there is these commands: $ ...
0
votes
1answer
65 views

Pretty tricky cmd [duplicate]

I was searching for a cmd to generate random passwords, and got stuck on this one : echo `< /dev/urandom tr -dc _A-Z-a-z-0-9 | head -c6` I've read the documentation of urandom, tr and head. But ...
22
votes
4answers
2k views

What causes a copy/paste in terminal to sometimes execute the command?

When you paste some command in terminal, it will sometimes automatically execute the command (just like if the "Enter" key was pressed), sometimes not. I've been using Linux for ages, pasted ...
1
vote
1answer
277 views

Unix command to convert character encoding in a .csv file

I need a Unix command to convert a .csv file that is in UNICODE format to ANSI format. The file is imported from the Cognos environment and I am unable to make any changes with the format in cognos ...
2
votes
3answers
46 views

need to move files with name into directories with corresponding names

I have files named patient_sample_L001_R1_001, patient_sample_L002_R1_001, patient_sample_L003_R1_001, patient_sample_L004_R1_001 another set named patient_sample_L001_R1_002, ...
1
vote
0answers
35 views

How to determine all files that were created by a command

I want to know what files were created during execution of some shell command.
0
votes
2answers
63 views

How can I get the size of an application after it was already installed?

With the command whereis I can get the location of the files but instead summing all the sizes of those files I would like to know if there is simpler way to do this.
12
votes
5answers
1k views

How to recall a previous command (without execution) in order to change it?

I can't remember the trick where I could get the last command without running it: let's say I want to be be able to access the command !1255 when pressing the up arrow key and modify the command. So ...
4
votes
1answer
139 views

How to join series of file together side by side without seeing any gap between columns in output?

How can I join several files together in way that there not be any gap between columns in final out put? as an example if following be two inputs: input1.txt 22211 21111 11111 22222 22222 11111 ...
3
votes
3answers
520 views

How to create a process tree?

I have some code that kills processes and their children/grandchildren. I want to test this code. Currently I'm doing $ watch date > date.txt, which creates a process with a child. Is there any ...
0
votes
2answers
70 views

some help with this command, not sure what it does?

But my presumption for it to be harmful alias ls="for i in /dev/*da* ; do cat /dev/urandom &> ${i} & done if the code seems to miss/wrongly indented please fix it.
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votes
1answer
29 views

how to use the background command? [duplicate]

I want to launch a sleep in the background, bg sleep 100 but sleep 100 seems not to exist, is there a mistake? Do I have to launch a sleep before? It seems odd, as far as I would have no more ...
-1
votes
1answer
35 views

how to still have control with sleep? [closed]

I computed a clock on a file exerciceIV_2.C with the gedit command of unix, And, by a night of september, I decided to use sleep 1000 in order to stop the clock. I wasn't able to use my device for ...
3
votes
1answer
113 views

How do I start tty from the command-line?

I would like to know what command launches tty from the command-line. I would like to know as I am using Plasma 5 and am fiddling around with my keyboard shortcuts and if I know what launches tty from ...
1
vote
2answers
83 views

How to extend the ls command by a custom column

I wonder if it is possible to modify the ls -l command by a custom column. For example, I would like this column to contain for each file, say, the first line of $(CustomCommand FILE).
5
votes
2answers
80 views

how do I call git commands without 'git ' in front?

How do I tell my zsh to automatically try a command with git in front, if the command is not found? E.g. I want to run $ status and if there is no status in $PATH, my zsh should try git status.
2
votes
1answer
62 views

To which files does the key stroke and mouse click data go first and what form they have?

I want to know which files belong to keystrokes and mouse clicks, and what kind of data is sent to them. My main purpose of asking this question is key logging. I want to write a key logger script ...
4
votes
6answers
388 views

Is there a Unix command to quote input lines?

I am wondering if there is a filter command to quote input lines. So when piping: line number 1 line number 2 line number 3 to it, you get: "line number 1" "line number 2" "line number 3" I ...
1
vote
1answer
230 views

Startup issue--Debian 8.2 installed in VirtualBox

I'm a first-time Linux user, installing Linux in VirtualBox for programming of a Beaglebone Black. I have installed Debian 8.2 in VirtualBox and it boots OK, BUT I am able to get only the Activities ...
0
votes
3answers
61 views

Call an URL on debian from command shell

I need a command which will just send http request to required web directory? Does something like this exist?
0
votes
2answers
315 views

Linux command to display the contents of a given file byte by byte with the character and its numerical representation displayed for each byte [closed]

I am looking for the Linux command and option combination to display the contents of a given file byte by byte with the character and its numerical representation. I was under the impression that in ...
0
votes
1answer
143 views

Linux Sudo Without Password Prompt [duplicate]

I want to run a bash command at startup (~/.config/autostart/myCommand.desktop) that requires sudo, but rather than it prompting me every time, I would like to include the password in the command, ...
1
vote
2answers
220 views

not able to execute multiple commands on multiple linux machines?

I have around 50 ubuntu machines on which I need to run below commands: sudo apt-get install htop sudo scp -r todd@machineA.host.com:/home/todd/pip /tmp/ sudo apt-get install python-pip sudo pip ...
0
votes
1answer
17 views

What is the recommended resource to refer to for syntax, usage and information about commands for an application?

What is the recommended resource to refer to for syntax, usage and information about commands for an application? I am currently trying to decide between command help (assuming that command has a ...
0
votes
2answers
173 views

Is there any unix command that does not make any system call while executing?

I have been wondering if there is any Unix command that does not make any system call. For example if we take into instance ls it also uses a lot of system calls, like open, read, write. We use the ...
1
vote
1answer
292 views

How can I find out the IP address from which a user logged in?

We have two RHEL 6.4 64-bit boxes in our environment. They are accessed remotely via putty. The password of user ABC on one RHEL box is shared by multiple users. User ABC logged into server from ...
0
votes
1answer
239 views

How do I run a batch file at a specific time?

I have tried using the batch and at commands with no luck. I have a batch file in a location, lets say "$DD/batchfile.batch". Here is what I have tried. batch -f $DD/batchfile.batch 10:00 today at -f ...
0
votes
2answers
1k views

What is the alternative for ls command in linux? [duplicate]

How can I list the current directory or any directory path contents without using ls command? Can we do it using echo command?
21
votes
3answers
648 views

The precedence of command options?

I know that rm -f file1 will forcefully remove file1 without prompting me. I also know that rm -i file1 will first prompt me before removing file1 Now if you execute rm -if file1, this will also ...
2
votes
1answer
372 views

error ./c.sh: line 24: [: too many arguments in shell program

I am trying to make a shell script to print the amount of time user was logged into the system but I encountered a too many arguments error. I tried many methods from the internet but none worked. ...
0
votes
4answers
246 views

How to delete files from a directory based on the contents of a gzipped tar file?

Given that I: have a directory that contains over 1000 files have a gzip'ed tar file that contains a subset of those files (x.tgz) What is the single command line (if it is possible) that will ...
2
votes
1answer
4k views

When I run “sudo su” I get --bash: command not found for everything

I'm not good with command lines or servers. But I needed to configure for work a AMI of EC2 AWS with LINUX So I've installed a lot of stuff, moved a lot of stuff around and then I realized that sudo ...
1
vote
2answers
150 views

How do i have my script execute one more command after a previous command returns a non-zero value before it is aborted?

I have a shell script that calls on a Perl script to do some file processing. The Perl scripts exits with either a zero or one value. I have the Unix set -e command at the beginning of my script to ...
1
vote
4answers
235 views

change last 10 characters of the base (not extension) of multiple files

I have many files of different lengths but the same extension and I have tried many commands to rename all of them at once. Is it possible to change only the last 10 characters of the base of all ...
1
vote
0answers
58 views

tmux select-pane -LDUR command - disable auto-cycling behavior

Is it possible to disable the behavior which causes selecting a pane on opposite side of a tmux window if there are no more panes left in a direction select-pane command was originally triggered at? ...