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
96 views

AIX cifs hostname with underscore

I am trying to type this comand but for some reason it takes the first and not the second version. I have entered both the host names in the host file, FYI. This command works (hostname zq13c1): ...
67
votes
15answers
11k views

What are the legitimate uses of the `touch` command?

What's the point of the touch command? I know I can create empty files with it, but so is also the case with echo -n. Otherwise, why would someone need to change the timestamps of a file? Unless to ...
4
votes
4answers
620 views

How to randomly sample a subset of a file

Is there any Linux command one can use to sample subset of a file? For instance, a file contains one million lines, and we want to randomly sample only one thousand lines from that file. For random ...
1
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1answer
76 views

Linux - How to open a console and display command results on startup?

I have a Linux server with a screen always displaying the end of a very usefull file. How could I automatically enter a shell and display the end of this file when the server starts? I'd like to do ...
1
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1answer
38 views

Mysql import the most recent file from a directory

I have a directory with daily backups of my entire MySQL database. I want to import the most recent backup into the database. I know to import a backup I need to use mysql -u root -ppasswordhere ...
4
votes
1answer
319 views

Which 2-letter POSIX command is different from all the others?

I was interviewed for an internship and I got the same question as this one: http://www.glassdoor.com/Interview/Which-2-letter-POSIX-command-is-different-from-all-the-others-QTN_498236.htm The ...
5
votes
3answers
670 views

What does “rm is hashed” mean?

I'm going through http://mywiki.wooledge.org/BashGuide/CommandsAndArguments and came across this: $ type rm rm is hashed (/bin/rm) $ type cd cd is a shell builtin Just a little earlier, the guide ...
7
votes
2answers
131 views

what is `env <command>` doing?

What is the command env ls -al doing? I had a Linux test and there was question: "How to run command directly, but not its alias?" I knew that there exists solution like prefixing command with some ...
1
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1answer
169 views

What is the extended version of the “sl” command?

Recently I've been discussing Unix humor with a friend and we got to the topic of the sl command. I got the sources, compiled, installed on our development machine, and... got rather disappointed. The ...
4
votes
1answer
115 views

What does `init [2]` mean in the COMMAND column of ps?

Reading What do the brackets around processes mean? I understand that the executable name is printed. Linux ps man page: Sometimes the process args will be unavailable; when this happens, ps will ...
3
votes
3answers
439 views

Correctly parse arguments in script behaving like a shell called through SSH

I have a server with a very limited used whom I want to be able to run two very specific (and custom) instructions through SSH. In order to do that, I have set the shell for that limited user to be a ...
3
votes
1answer
109 views

command not found handle doesn't work for url

I'm trying to setup the command_not_found_handle for URL links, %> command_not_found_handle() { echo "OK"; } %> aaaaa OK %> http://www.google.com bash: http://www.google.com: No such file or ...
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2answers
95 views

Using globbing/wildcards when Opening Files from Terminal

I have a folder A. Inside the folder, there are some files a,b,c,d and there is a subfolder, B, containing files e,f,g. Suppose I want to open files a,b,c,d: then I just type xdg-open *. However, ...
3
votes
2answers
309 views

what is the meaning of this sed command?

sed -e 's/72;/72, next_val = 0x11111111;/;/@/{h;s/test/next/g;x;G}' fmt_vuln.c > fmt_vuln2.c could you tell me about what is the meaning of ;/@/{h;s/test/next/g;x;G}?
13
votes
1answer
510 views

What does yes $(yes yes) do?

Wondering what use the yes command might be, I stumbled upon this comment, and tried to execute yes $(yes yes) From what I understand, this should simply print out an infinite sequence of yes, but ...
3
votes
2answers
436 views

print command instead of echo in linux

I simply can print a message in terminal using linux echo command. prayag@prayag$ echo "prayag works on JVM" prayag works on JVM Can I have the same output with print command. I actually went ...
7
votes
3answers
475 views

Difference between sudo -i and sudo su [duplicate]

I was wondering what the difference is between sudo -i and sudo su?
2
votes
2answers
3k views

How to list groups with gid in redhat?

I first listed the groups using : groups I added group using groupadd -g 300 oinstall groupadd –g 500 dba and then when I do groups root bin daemon sys adm disk wheel sfcb I am unable to ...
0
votes
1answer
268 views

Unable to execute command in the Linux with an user

Two scenarios here. Sudo rights are given for a particular group. a. A new user is created and is assigned to the group. b. Using this user, when we execute commands via shell script it is unable to ...
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1answer
37 views

Linux Red Hat Library Dependencies question

I have to create a script that will download 8 libraries. However, on the server where we have all the libraries, I can only find 2 or 3 of these 8. I believe these 2 or 3 actually depend on other ...
1
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4answers
309 views

How can I force the use of a specific binary when running a script

How can I force a specific binary to be used when executing a bash script? I have a bash script which uses the "php" binary. There are several php versions on my computer. The main php binary, as ...
0
votes
1answer
409 views

Linux Mint XFCE, command to launch menu

What is the command that launches the whisker menu in the Linux Mint xfce edition. For another distribution that used xfce it was xfce4-popup-whisker menu but that doesn't seem to work. I would like ...
0
votes
1answer
36 views

In which way is a commented line active in a program file?

To solve the bug reported here the solution seems to be commenting, not just adding a certain line in a file - as explained here and here. That is - to make that bug disappear in Xfce, a certain line ...
1
vote
4answers
192 views

List all commands that a shell knows

What can I type at my shell (which happens to be bash) that will list all the commands that are recognized? Also, does this differ by shell? Or do all shells just have a "directory" of commands they ...
0
votes
2answers
452 views

I used the move command and all files disappeared [duplicate]

I was moving all data to another folder and made 1 mistake and run this commmand mv * /* all files have disappeared now. How can I find them? Or are they deleted?
5
votes
3answers
1k views

Difference between 'ifconfig' and 'ip' commands

I read some articles/tutorials on 'ifconfig' command, most of them included a common statement - "ifconfig is deprecated by ip command" and suggested to learn ip command. But none of them ...
0
votes
2answers
659 views

The -cp option to the java command [closed]

java -cp FILE.jar FILE.Main inputfile What does the -cp option mean? For that matter, what a negative sign in front mean? I've searched everywhere and couldn't find the answer.
0
votes
2answers
168 views

What is the Run prompt equivalency in Linux?

In Windows, there is the Run prompt, which you can access with Win+R key. What is the equivalency to this in Linux? Is there even such a thing or is the Terminal the main prompt you would use in ...
2
votes
3answers
493 views

what is “play” command/package available by default in Linux Mint and how to remove it

I'm trying install play framework on Linux Mint and setup its variable: export PATH=$PATH:/relativePath/to/play But command can't run because it's being overlapped by another play command which was ...
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vote
0answers
53 views

Using alot MUA with nottoomuch-addresses

I try to use the MUA alot to work with the nottoomuch-addresses.sh script for autocompletion of addresses within alot like described in: ...
4
votes
3answers
515 views

How to find a file with specific permission of a specific user?

How do I get a list of all the files which permission is "read and write" for a specific user. For example, when I go on the desktop of my mac, then right click on file "A", then "get info", then on ...
3
votes
2answers
275 views

Memory usage command with syntax similar to the time command

What command shows the memory usage of a program, i am looking for a command that is simple to use and has similar syntax to the time command. I am trying to find the memory usage of a md5 hashing ...
4
votes
1answer
163 views

What does the command “$()” do in UNIX?

What does the command $() do in UNIX? Could someone explain what is the significance of $ in the below examples; $(echo var=10) and eval $(echo var=10)
0
votes
1answer
594 views

How to run a shell command in a server?

I am fairly familiar with computers and web stuff but this is a bit out of my comfort zone. I have a shell script (.sh file) I want to run in a Linux server I have one site hosted (the script is a ...
1
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1answer
154 views

Execute command supplied by function parameters

I'm trying to create a function method in a bash script that executes a command which is supplied to the method by the paramters. Meaning somethings like this: special_execute() { # Some code ...
12
votes
5answers
4k 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.
0
votes
4answers
3k views

How to create custom commands in Unix/Linux? [closed]

I'm a newbie in Unix/Linux environment. Can anyone guide me to create custom commands in Unix/Linux. Thanks in advance
1
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1answer
92 views

Find if a process terminates in a specific amount of time

I am running a program.Inside this program i run a specific command and i use ulimit command to terminate the running of that command if it exceeds an amount of time.To be more clear i run this: ...
1
vote
1answer
322 views

Bash command that uses wildcard in place of folder to copy folder contents of multiple files into one directory?

I have a directory ~/dir that contains a bunch of random folders like: ~/dir/av 801 and ~/dir/lm 320. I want to copy the contents of every inner folder (ie: av 801) into a different directory. The ...
0
votes
1answer
89 views

How can I see the rate of my wireless card?

I am setting manually the bit-rate of my wireless card ! sudo iwconfig wlan0 rate 54M Where can I see if it is applied, because the command does not give any feedback !!!
4
votes
4answers
539 views

What does <<< mean? [duplicate]

What does <<< mean? Here is an example: $ sed 's/a/b/g' <<< "aaa" bbb Is it something general that works with more Linux commands? It looks like it's feeding the sed program with ...
0
votes
1answer
89 views

Command “I'm” on linux ubuntu [closed]

I'm new at linux, ubuntu, and I did type I'm running and then like if it was a program or something else, I was allowed to write more... nothing else... I just want to know more about this command ...
-1
votes
1answer
106 views

can't view `split` output files with cat [closed]

File a.txt contains: 1 one 2 two 3 three 4 four 5 five 6 six Then the command: split -2 a.txt output_ yields as output three new files output_aa, output_ab, output_ac When I type: cat output_aa I ...
22
votes
3answers
4k views

Why is dmesg called dmesg?

Is there any explanation/history behind the name of the command dmesg (which prints out some kernel messages)?
0
votes
0answers
175 views

I want to use the command 'shutdown -r now' in Lazarus

I want to use the command shutdown -r now in Lazarus, but I don't know how to do it. Any tips or examples that you can give me I would be most grateful.
8
votes
0answers
208 views

how to get exit status from the command before the last [duplicate]

I have solaris machine ( solaris 10 ) please Look on the following simple commands (haconf -makerw | grep -iq "Cluster already writable") # haconf -makerw VCS WARNING V-16-1-10364 Cluster ...
3
votes
5answers
195 views

find which system is transmitting through a particular port

I am using command nc -lu <port no.> to find on given port any data is receiving or not. I am getting data if there is transmission going on (but don't know from where!). Is there any way that ...
0
votes
2answers
252 views

'df' command doesn't list /home directory

In the book I am reading, the output of df command is shown like this: Filesystem 1K-blocks Used Available Use% Mounted on /dev/sda2 15115452 5012392 9949716 34% / /dev/sda5 59631908 ...
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vote
1answer
155 views

How to find packages only which package name equal to text with aptitude?

When I want to search a package which named 'z', aptitude find packages which contains 'z' in package name same as 'like' in SQL, so aptitude find a lots of packages. How can I search packages which ...
0
votes
3answers
831 views

Find executable files recursively

I have got the directory called Test and a few directories inside it. Both Test and the directories inside it have executable files. I'd like to print them with ls. I'd use this command. ls -l `find ...