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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1answer
26 views

What's the inverse of the X mnemonic in chmod?

Is there a way other than find … -type f -exec chmod -x {} + to remove the x bit from u, g and/or o recursively with just chmod? The X mnemonic in chmod allows one to recursively set permissions on a ...
0
votes
3answers
139 views

Can a command be executed without a shell?

I am developing a binary executable program command to execute programs and return the output into a text field. The parameters to the command involve the command itself as it would be typed on the ...
32
votes
3answers
11k views

How to stop the find command after first match?

Is there a way to force the find command to stop right after finding the first match?
8
votes
1answer
18k views

ifconfig command not found

I've just installed CentOS7 as a virtual machine on my mac (osx10.9.3 + virtualbox) .Running ifconfig returns command not found. Also running sudo /sbin/ifconfig returns commmand not found. I am root. ...
0
votes
4answers
52 views

Remove first 2 columns from first row of a file

I am looking for a command to remove first 2 columns from the first row of a file. The delimiter for the columns is a pipe. Number of columns vary. we just need to blindly remove first 2 columns. ...
0
votes
1answer
14 views

run remote command to save debian package list

I'd like to backup the package list(dpkg) of some remote computers to a backup server: all of them running Debian. I already configured the rsa key to login remotely as root on the other computers ...
1
vote
3answers
67 views

List of files where the line count is greater than 2

Bunch of files exist in a directory. Some files have 1 line in it, some files have more number of lines. I'm trying to display filenames from a particular directory(with full path), where the ...
-1
votes
0answers
15 views

Command to check package version in Sles

What is the command to check package version in Sles OS?
3
votes
2answers
100 views

Convert all non-JPG images to JPGs

What command can I use to convert all images in a folder which are not JPGs (PNG and BMP primarily) to JPG? I'd also like the conversion quality to be 100%. And I'd like the converted images to ...
0
votes
0answers
23 views

Failed to execute the iscsiadm commands

When I am using the command: iscsiadm -m discoverydb -t st -p 10.10.11.12:3260 -I be2iscsi.00:17:a4:7a:e3:34.ipv4.0 --discover -P 1 I am getting below error: scsi host1: BC_207 : MBX Cmd Failed ...
2
votes
1answer
27 views

Failed in execute of “lsscsi” command [closed]

I can't execute the "lsscsi" command in linux, I keep getting "command not found" when I try to run it. How can I solve this issue?
1
vote
2answers
192 views

What is difference between pbrun and sudo command?

What is difference between pbrun and sudo command? I have seen people executing pbrun sudo su - what this means? I know su -, it will try to switch to root user. What speciality pbrun gives to sudo ...
0
votes
0answers
38 views

How to manage any command access privileges on debian linux

I am using Debian 7, and my desktop is xfce. I want to achieve managing any command on Linux. For example, executing /usr/bin/xfce4-taskmanager command would not require sudo privileges so any user ...
4
votes
1answer
176 views

ZIP files with size limit

Is there a command to create multiple ZIP files based on file size? So that in a folder of 600 files, totalling 1 GB, the command will create 4 zips roughly equal to 250mb. There's a similar command ...
5
votes
2answers
96 views

Converting ext2 to ext4

I have a file-server with three disk's that are ext2 file-systems, is it possible to change/convert these to ext4 which have much improved characteristics, while data is on the disk's and without ...
8
votes
2answers
499 views

Finding a file type assuming wrong extension

I have an image archive I keep up. Sometimes, the sites I pull them from reformat the file while keeping the extension the same, most often making PNG images into JPG's that are still named ".png". ...
1
vote
5answers
64 views

Difference between 'ls -ltr abc*' and 'find ./ -name abc*' command? [duplicate]

To search a file in a directory, I found two commands as below: ls -ltr initialfilename* find ./ -name initialfilename* Sometime, first command gives me the search result but sometime I used to ...
3
votes
3answers
52 views

When to use XPG* version of a command?

I occasionally do work on an older Solaris machine whose default version of grep is non-POSIX-compliant. This causes problems in my rc files because the default grep on the machine doesn't support ...
2
votes
1answer
33 views

External command to force ofstream to flush

I have a C++ ofstream that, for performance reasons, I don't flush from inside the code. However, occasionally I need to inspect the file contents. Is there a Linux command that will force the ...
3
votes
2answers
143 views

How to check if vim is installed?

I want to know how to check whether a command is installed. Specifically, I want to alias vi to vim on all machines where vim is a valid command. And I want to keep my *rc files generic. But some ...
0
votes
0answers
20 views

Sed replace with command output [duplicate]

I'm trying to replace text with the contents of a file and I'm getting errors. This works: cat /tmp/test | sed -e "s/__TEST__/$(cat pass)/g" But this one doesn't cat /tmp/test | sed -e ...
0
votes
3answers
43 views

What is meaning of {} + in the exec command?

I want to know the meaning of {} + in the exec command, and what is the difference between {} + and {} \;. To be exact, what is the difference between these two: find . -type f -exec chmod 775 {} + ...
0
votes
0answers
17 views

How to find last x minute internet usage

How can i find out the last X minute download bandwidth in megabyte? i want to use it within a bash script.
0
votes
0answers
12 views

What shell extension recommends packages if command is not found and how to update it? [duplicate]

I know this question might sound a little strange but i really don't know how to describe it better. On my Debian system I have a shell extension for bash that, whenever I enter an unknown command, ...
2
votes
2answers
615 views

How to permanently enable scl CentOS 6.4?

I installed a newer version of devtoolset (1.1) and was wondering how I would go about permanently setting these to be default. Right now, when I ssh into my server running CentOS, I have to run this ...
0
votes
0answers
22 views

Recover a folder just delete [duplicate]

I just delete (was my error) a folder my_folder by doing $ rm -R my_folder, how can I recover it?
4
votes
3answers
4k views

find - exec rm vs -delete

I'm trying to understand the difference between these two commands: sudo find / -name .DS_Store -delete and sudo find / -name ".DS_Store" -exec rm {} \; I noticed that the execmethod is ...
0
votes
0answers
9 views

Verify par2 on different media?

Is there an easy way to point to a par2 index file in one place and have it use a different base directory for the files to verify? Here's what I'm up to: I copy a bunch of stuff to backup media. ...
12
votes
6answers
21k views

Delete 100 lines from vi editor using single command

I am using Ubuntu and trying to delete all 100 lines from vi editor but I got interview question of doing this in one command.
11
votes
2answers
855 views

What is DISPLAY=:0?

What is DISPLAY=:0 and what does it mean? It isn't a command, is it? (gnome-panel is a command.) DISPLAY=:0 gnome-panel
1
vote
1answer
198 views

lsof: no pwd entry for UID

I'm trying to run command lsof |grep services on my Solaris 10 to find any processes that have big files which are using up the disk space but i got a bunch of lines saying: lsof: no pwd entry for ...
4
votes
3answers
179 views

Get last part of string after hyphen

Is there a simple command line to extract the last part of a string separated by hyphens? E.g., I want to extract 123 from foo-bar-123.
0
votes
2answers
46 views

Create own launch command in Fedora

How can I set alias for gnome-calculator so I can launch it just by typing calc. And how can I create my own command for my own application? I need it to work in this command prompt: I know that in ...
-3
votes
1answer
273 views
0
votes
0answers
15 views

using man command for a system call close [duplicate]

So if we have an executable program called close on linux, and theres also a system call close. How can i generate a command that makes sure i get the manual for the system call "close" rather than ...
1
vote
3answers
109 views

What is the reason for having numbers within the brackets of a function ? [duplicate]

I have seen on many occasions a name of a function (frankly speaking I just call it function because of it typical appearance, they are though sometimes named commands or system calls but I do not ...
1
vote
1answer
23 views

Sort packages by size one-liner as function

While surfing web I've discovered nice one-liner that suits my needs well expac -s "%-30n %m" | sort -hk 2 | awk '{print $1, $2/1024/1024}' | column -t| However all the functional needed I got used ...
2
votes
2answers
56 views

What is the name of the app displaying custom text in fullscreen size?

I have seen years ago a very handy application: the command displayed it's first argument enlarged to fit the whole screen. For example... thiscommand AA ...then you could see two very big A ...
1
vote
1answer
24 views

Command to get the id-port no: - & last three strings?

Can someone please help me with the one liner command to get the blocked and italicized only from running something like...ps -ef | grep java | cut -d: -f20- | cut -d ' ' -f20 | Desired Result ...
1
vote
0answers
36 views

Automatically Rename File if there's a Duplicate Filename

I have a command that creates montages of images. Sometimes I want to save multiple montages from a series of images in a folder. The montage will be saved as output.jpg. But if I create another ...
4
votes
5answers
292 views

Showing all pages at once with man command [duplicate]

Say if I run the command man who, I have to keep pressing space or enter to show all content. Is there a way to show all of the content at once?
1
vote
2answers
47 views

I changed my PATH and now for every command it returns “command not found” [closed]

I am on MacOSX, using the iTerm and I'm very new at all of this. I am trying to prepare for installing bioinformatics programs, so I made new directories for "Scripts" and "Programs" and wanted to add ...
-4
votes
4answers
202 views

How can I `man print`?

Where can I find more information about the command(?) print since I don't receive a result when I input man print? For example, in the zsh I can do the following: $ print "Hello, world\!" Hello, ...
1
vote
1answer
44 views

How to switch user with pre-configured credentials in SSH Terminal after logging in as standard user

I was wondering how to execute a command file where: After logging in as a standard user, I want to switch user to "username" with password being "password", I can successfully execute the command.txt ...
3
votes
3answers
66 views

how to remove accidentally created '~' and '..'

I'm using wget to download some webpages and I used the -P option without knowing that it wouldn't expend .. or ~. So I found I've created them after running the program. Now the problem is, how do I ...
1
vote
0answers
14 views

Combine multiple PSCP commands?

I need to transfer multiple folders from my server to my pc. I'm currently using a command like: pscp -r user@ServerIP:/public_html/folderA "C:\folderA" && pscp -r ...
0
votes
1answer
152 views

What does the option -C achieve in ls output?

In the man pages it says: -C list entries by columns However, I really cannot notice any difference between the output of ls or ls -C, could someone explain this to me?
0
votes
1answer
344 views

command to clean up old log files

I was trying to automate some auto cleaning of my Ubuntu System, with Cron Jobs I tryed to simplify this: sudo find /var/log -type f -name "*.1.gz" -delete sudo find /var/log -type f -name "*.2.gz" ...
0
votes
2answers
67 views

How can I open a man page in a new terminal window?

I'm wondering if anyone can help me with a workflow issue. I sometimes open up a man page for a command, take note of several command options and parameters, go back to the command line and then input ...
1
vote
1answer
31 views

Snapshotting a Linux container in Debian

I know that the command $ lxc-snapshot exists somewhere, but it seems that it's not available on Debian? Forgive my Linux ignorance - but how do I get a hold of this capability? Is there an ...