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

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108
votes
14answers
48k views

How to have tail -f show colored output

I'd like to be able to tail the output of a server log file that has messages like: INFO SEVERE etc, and if it's SEVERE, show the line in red; if it's INFO, in green. What kind of alias can I ...
1
vote
3answers
97 views

Bash long string, no word splitting?

I want to tidy up some script with long commands, so that for example: { somecheck || somecomand "reallyreallyreallyreallyreallyreallylongstring" } &> /dev/null & becomes something like: ...
1
vote
0answers
43 views

Can't run php cli at webuser but will run as root

I am running a Magento application on a Nginx server. nginx + php-fpm running as webuser:www There are some function in the shell directory of Magento which run fine as root and the import run fine ...
1
vote
5answers
7k views

checking running process

I am new babe to Linux. So please skip to read if you are not patient with begineer. Let's say I am asked to check and shut down the processes that I am not familiar with. So when I ls under bin ...
4
votes
4answers
410 views

How to capture command line input into logfile and execute it at the same time?

Let's say I issue some commands on the command line: #capture what follows $ echo "foo" foo # don't capture $ echo "bing" bing # capture again $ echo "bar" bar How can I log commands selectively ...
0
votes
1answer
52 views

-bash: auto: command not found

I'm going to config my network interfaces and run this command: auto eth0 but it returns -bash: auto: command not found. It seems I've missed something which I don't know. Any idea? What should I ...
6
votes
6answers
11k views

How to output only file names (with spaces) in ls -Al?

I should echo only names of files or directories with this construction: ls -Al | while read string do ... done ls -Al output : drwxr-xr-x 12 s162103 studs 12 march 28 12:49 personal ...
9
votes
2answers
259 views

How to access the second argument from the last command in the history ?

I am starting to learn some Regex, therefore I use this command repeatedly: grep pattern /usr/share/dict/american-english Only the part with pattern changes, so I have to write the long expression ...
0
votes
3answers
41 views

is it possible to create a macro-like user defined shell command?

Is it possible to run a single shortened command that would in turn initiate multiple longer to type commands? for instance, $ kontact & rekonq when passed to my terminal opens two ...
0
votes
1answer
31 views

how to open sets of programs simultaneously with command line

I recently learned here how to open a program from the command line. my question is, how can i make a set of programs open simultaneously with one command entered?
3
votes
1answer
121 views

Initiating programs from command line

Silly question, but hopefully some easy rep for someone. I am new to the linux/open source community, and I find it very feature rich, but often confusing. I am trying to configure a speedy ...
7
votes
3answers
3k views

Why a long delay after command not found?

Often when I mistype a command such as ls (e.g. I hit ENTER before I type 's') there is a long (~2s) delay after the terminal displays: bash: l: command not found... I can understand the reasons ...
1
vote
2answers
36 views

Merge lines in file together from regex to “lineify” multiline log log files

Stadard unix command line tools (grep, cut, sed etc.) all work one line at a time. And nearly always, this is great. However I am trying to parse some postgresql slow query logs. Each entry has some ...
1
vote
1answer
65 views

Running every command through another

I'm setting up a system in which any external command that does something with real effect must be crypthographically signed before before the system will execute them. The restrictions are in place ...
2
votes
2answers
451 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 ...
-1
votes
1answer
41 views

Replace mutiple strings with different values in a file using unix [duplicate]

I have a file in which the data is like below, 01,0000000,xxxxxxx/ 02,xxxxxxxx,yyyyyy/ 03,test1,41203016,,/ 01,0000000,xxxxxxx/ ...
17
votes
6answers
7k views

How to display numbers in reverse order using seq(1)?

I have iterate over numbers in various order. I am able to display them in increasing order, even with steps like: $ seq --separator="," 1 10 1,2,3,4,5,6,7,8,9,10 $ seq --separator="," 1 2 10 ...
0
votes
2answers
826 views

How to get sound intensity of an audio input through terminal?

I want to know the intensity of the sound being heard by an audio in source like a mic or Line-in through Command line. Kinda like the progressbar under the mouse but in CLI. audiointensity mic0 10 ...
1
vote
1answer
44 views

How to copy a directory with only specified type of files?

I got a git directory with plenty of python files(and some special file like .git). I'd like to copy only these python files to another directory with the directory structure unchanged. How to do ...
4
votes
4answers
3k views

Get list of subdirectories which contain a file matching a string

How can I get a list of the subdirectories which contain a file matching a particular string? More specifically, I am looking for directories which contain a file with the letter 'f' somewhere ...
0
votes
1answer
35 views

What is the email matching regex in basic regex for grep?

I created a text file and put some email addresses in it. Then I used grep to find them. Indeed it worked: # pattern="^[a-zA-Z0-9]+@[a-zA-Z0-9]+\.[a-z]{2,}" # grep -E $pattern regexfile but only as ...
4
votes
1answer
3k views

Convert a folder of images into a multi-page pdf file using command line tools?

I have a folder with 100 jpg images. I want to convert these images into a multi-page pdf file, with all the images (cropped to A4 size). They are already in the correct rotation. Which tools should ...
35
votes
11answers
21k views

Markdown Viewer

I found a file formatted with Markdown. Could you guys suggest what viewer that I could use to view this type of files? Hopefully one without gui (if it's possible) Update I was actually looking for ...
0
votes
0answers
23 views

command line tool group chat utility under linux

I am working on mac osx Yosemite. I want to reach to a user under a certain IP address. (It might be local network or thru internet). I want to do it thru terminal using the default tools that ...
3
votes
3answers
122 views

extract from line to line and then save to separate file

I tried my luck with grep and sed but somehow I don't manage to get it right. I have a log file which is about 8 GB in size. I need to analyze a 15 minute time period of suspicious activity. I ...
1
vote
1answer
45 views

cfdisk or fdisk?

While reading the man page for fdisk I came across this interesting text: There are several *fdisk programs around. Each has its problems and strengths. Try them in the order ...
8
votes
5answers
570 views

What's the best way to take a segment out of a text file?

What's a good way of extracting say, lines 20 -45 out of a huge text file. Non-interactively of course!
3
votes
2answers
570 views

Jingle CLI client / Jitsi replacement / VOIP

I am looking for a Jingle client for the command line. Currently, I use Jitsi, but my dreams of not needing the GUI for more than just web-browsing are not realized due to my reliance on this ...
17
votes
2answers
2k views

How did this '&' at the end of my command, make the script SO fast?

While solving some CTF challenges online, I came across a situation where I needed to bruteforce a server. This is the code I wrote: #!/bin/bash for i in {0..9}{0..9}{0..9}{0..9} do echo ...
22
votes
6answers
53k views

Is there a way to see details of all the threads that a process has in Linux?

For Windows, I think Process Explorer shows you all the threads under a process. Is there a similar command line utility for Linux that can show me details about all the threads a particular process ...
0
votes
1answer
30 views

How to shutdown Linux parted magic from terminal?

Once in a while I have to use parted magic to restore superblocks. I tried to execute in the terminal: shutdown -h now telinit 0 Both did not work, what else might be possible to shutdown Linux via ...
2
votes
2answers
69 views

Can I recover my .bash_profile from an open Terminal tab?

I'm actually using a Macbook Pro, and am quite new to non-Windows OS' (I know, for shame!), and I've made the mistake of overwriting my bash profile, instead of appending to it... (n00b!). What I do ...
2
votes
1answer
62 views

how to get the full command line args passed to a process on unix/linux systems? [duplicate]

I am looking for a reliable way to get the full command line args passed to a process even when these are very long. I do know about ps -f -p <pid> and /proc/<pid>/cmdline, both of which ...
9
votes
5answers
12k views

Is there a simple linux command that will tell me what my display manager is?

Is there a simple linux command that will tell me what my display manager is? I'm using Xfce. Are different desktop environments usually affiliated with different display managers?
1
vote
3answers
133 views

How to perform grep onto the output of ldd properly ?

# ldd /usr/bin/ffmpeg linux-vdso.so.1 => (0x00007ffffc1fe000) libavfilter.so.0 => not found libpostproc.so.51 => not found libswscale.so.0 => not found ...
2
votes
1answer
42 views

How to tell xargs which argument to choose ? [duplicate]

When xargs redirects the first commands output into the second command's argument and there is no choice about which argument for which element of the output, then there is only one way, for instance: ...
12
votes
6answers
18k 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.
2
votes
2answers
653 views

How to enable double tab autocompletion list in csh?

I've worked in Linux before where when I press tab it autocompletes until it becomes ambiguous. If I pressed tab twice at that point it would give me a list of all possible completions. My current ...
1
vote
1answer
46 views

How to distinguish between output of numerous similar commands

Say I am issuing ls -la in a directory that has hundreds if not thousands of files, then changing to another directions and issuing ls -la. I then need to scroll up to see what files are in the most ...
0
votes
1answer
23 views

How to reduce the size of an mpeg file using the command line ?

I have a file, the output of the file command displays: jeff_western2.mp4: ISO Media, MPEG v4 system, version 1 I do not know how to lookup the resolution but it looks quiet high, the file itself ...
5
votes
1answer
522 views

How to write/edit/update the OsIndications efi variable from command line?

In the need to enter the UEFI firmware setup utility while using ultra fast boot (keyboard drivers are not loaded during POST), I wish to write to the "Os Indications" efi variable. My OS is Ubuntu ...
2
votes
6answers
142 views

Join lines of text with repeated beginning

I have a long text file (a tab-file for stardict-editor) which consists of lines in the following format: word1 some text word1 some other text word2 more text word3 even more and would like to ...
0
votes
2answers
47 views

Get all hardisk list (/dev/sd*)Using command line

I need to get all the hardisk connected to my PC like, /dev/sda /dev/sdb /dev/sdc later I have to use it in script and monitor using iostat I alrady found fdisk command, it seems to be hard ...
1
vote
5answers
2k views

How can I output the difference between 2 files?

My file consists of the the following; roughly: username:username:username:username:username The above line continues to about 600 characters. I use the awk command in order to use it as an ...
8
votes
1answer
3k views

Command-line mv exclusion list

Is there a way to mv,cp, or any file operation such that I could specify all the files I don't want affected? For example, say I have a folder with the files file1, file2, and file3, and I want to ...
1
vote
1answer
38 views

Is it possible to establish a Socket session (between Server and Client) using shell commands ?

From what I read (only the very outline, i do not know C Language) a Socket session is established between a server and a client by calling functions for both of them in a certain order. It starts ...
7
votes
1answer
307 views

In which situations are PS2, PS3, PS4 used as the prompt?

When I log on into the shell I see the prompt whose value is stored in PS1. I also encountereded another prompt (but do not know which one) when I used the here-document syntax: bc << HERE ...
3
votes
5answers
291 views

How to grep the n-th substring between given delimiters?

Let's say we have a string and its delimiter is ?: Leslie Cheung April 1 ? Elvis August 16 ? Leonard Nimoy February 27 I know how to grep the first substring between delimiters: echo $above_string ...
2
votes
2answers
39 views

Is it possible to change the PS1 periodically by a script in the background?

I just came across the PS1 variable (so I am far from being an expert). It is possible to change the prompt by simply changing this variables value, for instance: PS1="\h" hostname as Prompt PS1="\j" ...
1
vote
2answers
45 views

Can not evoke watch command with non-integer time option

I want to start the w command periodically, according to man watch the smallest possible time interval is 0.1. I tried: watch -n1 w (works) watch -n1.5 w (does not work) watch -n0.1 w ...