small programs used on the command line to do a specific job

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3
votes
2answers
144 views

Peer to peer~ish LAN storage

I have a distributed application that consists in a main CMS server where "human" users can upload videos, pictures (media content, basically) and a bunch of "players" that play those videos or ...
5
votes
1answer
1k views

Are there alternatives for `dd`?

What other tools should I use to read and write files with truncation, seeking and skipping. dd's command line options seem inconvenient and foreign and I don't like choosing between slow, but precise ...
6
votes
4answers
3k views

cp or rsync, is cp really worth it?

I hope this does not count as a question without a real answer, as I can't seem to find a good reason to use cp(1) over rsync(1) in virtually all circumstances. Should one typically favour rsync over ...
12
votes
5answers
2k views

A standard tool to convert a byte-count into human KiB MiB etc; like du, ls1

Is there a standard tool which converts an integer count of Bytes into a human-readable count of the largest possible unit-size, while keeping the numeric value between 1.00 and 1023.99 ? I have my ...
4
votes
3answers
394 views

Monitor directory and if a file is requested then rsync on demand

Is there a tool that monitors a certain directory and if a program tries to access a file in that directory, the program loads that file from another place transparent for any application that tries ...
-1
votes
1answer
582 views

Phrase Express Equivalent for Linux?

Is there some sort of auto text-insertion program with macros, similar to PhraseExpress for Windows in Linux?
1
vote
1answer
362 views

How to change the default line length for od and hexdump

Is there any way to change the default line length for the od and hexdump commands? Can't see anything apropriate in the man pages.
0
votes
3answers
121 views

CLI & Markup language

I often find myself editing files for my personal use that are plaintext. Either those are notes, annotations in project directories or sometimes the output of programs that I annotate. However, ...
2
votes
2answers
580 views

List of available command options?

I'm currently setting up my first web server without a control panel and so far things are going pretty good! I was just wondering if anyone could direct me to somewhere that explains all of the ...
1
vote
3answers
147 views

line count on all the PHP scripts within my webroot with wc

How can I do a line count on all the PHP scripts within my webroot? I am trying something like this below to no avail: wc -l *.php
8
votes
2answers
999 views

Alternative to watch which support colors

I have a command (phpunit) which has a colored output. According to the watch, command I should be able to use the --color flag to allow color rendering to pass through. However, this isn't working. ...
4
votes
1answer
172 views

Multi-machine tool in the spirit of moreutils' `parallel`?

parallel from moreutils is a great tool for, among other things, distributing m independent tasks evenly over n CPUs. Does anybody know of a tool that accomplishes the same thing for multiple ...
2
votes
4answers
210 views

xsel < /tmp/xselection not working in script

I'm trying to use the following script: #!/usr/bin/env bash # Edit xselection in gvim xsel > /tmp/xselection gvim /tmp/xselection xsel < /tmp/xselection But the final line does not seem to be ...
3
votes
3answers
672 views

Why doesn't uname -a return a useful identifier

I typed the command uname -a into my college's server and got this: 2.6.18-274.3.1.el5 #1 SMP Tue Sep 6 20:14:03 EDT 2011 i686 i686 i386 GNU/Linux Are they trying to hide the version of Linux that ...
7
votes
3answers
1k views

Fix or alternative for mktemp in OS X

I'm looking at a bash script someone else wrote that uses mktemp: TEMP=`mktemp --directory` However, this line does not work on my machine (OS X 10.6). How would I fix this line so that it is ...
20
votes
4answers
727 views

Are Linux utilities smart when running piped commands?

I was just running a few commands in a terminal and I started wondering, does Unix/Linux take shortcuts when running piped commands? For example, let's say I have a file with one million lines, the ...
6
votes
1answer
261 views

Interactive tree command

Is there any version of tree command that displays file structure as a tree structure, but in a way that I can interactively walk trough? Why do I need it exactly - I am trying to simulate TextMate ...
3
votes
2answers
2k views

file block size - difference between stat and ls

I've noticed that when I do a: ls -ls file It provides block count, say 8 blocks. When I do: stat file I notice that the block count is 16, twice the number given by ls. The block size on my ...
12
votes
2answers
241 views

`test` and `[` - different binaries, any difference?

I noticed while answering another question that test and [ are different binaries, but the [ manpage pulls up test's. Besides the requirement for an ending ], is there any difference? If not, why are ...
2
votes
1answer
875 views

Listing a hardrive partition by blocks using LBA

Most hard drive and partition inspection tools seem to list the items using sectors, head.. etc. From another question I was told that these are virtual because they have to be converted from lba, ...
2
votes
1answer
470 views

How to plot the output of a command

How can I plot the output of this command line with GNUPlot? What should the diagram script look like? I want a histogram. wget -O - -o /dev/null http://www.stackoverflow.com/ | cat | cat | sed ...
4
votes
2answers
1k views

Set alignment of numeric columns when columnating data

I use column -t to format data for easy viewing in the shell, but there seems to be no option to specify column alignment (e.g. align to the right). Any Bash one-liners to do it? I have arbitrary ...
3
votes
2answers
86 views

Output the changes to a log file

If I use tail -f *filename* I get a real nice display of whatever is changing in a given file. However, sometimes I want to be able to search this text or otherwise look it over slowly. Is ...
8
votes
4answers
11k views

How can I use sed to replace a multi-line string?

I've noticed that, if I add \n to a patter for a substitute using sed, it does not match. Example: $ cat > alpha.txt This is a test Please do not be alarmed $ sed -i'.original' 's/a test\nPlease ...
4
votes
2answers
190 views

What are all the items on the cover of the “Linux Administration Handbook”?

As I mentioned in What do all the pictures on the front of the "Unix and Linux System Administration Handbook" represent? I'm fairly new to Linux and Unix. @jasonwryan provided an excellent ...
11
votes
1answer
601 views

What do all the pictures on the front of the “Unix and Linux System Administration Handbook” represent?

I'm a newcomer to Unix and Linux, and I've been trying to get up to speed on everything. One of the guides I've used is the "Unix and Linux System Administration Handbook" It's a pretty great book, ...
7
votes
4answers
2k views

creating a sequence of numbers, one per line in a file

Is there a way to create out of thin air, a file that is a sequence of numbers, starting at a given number, one per line? something like magic_command start 100 lines 5 > b.txt and then, b.txt ...
3
votes
1answer
730 views

installing column unix utility on windows

I would like to be able to use the BSD unix utilities: column, join and paste in my Cygwin installation. It seems that they are not available, or I cannot find them. Is there a way to install them so ...
2
votes
1answer
851 views

How synchronize two disks (or folders) using symbolic (or hard) links (like rsync)?

I'm searching a tool or a shell script or another program to synchronize two or more folders or disks. But it differs of rsync tool, because, I don't want to duplicate the missing file, but do a ...
2
votes
1answer
76 views

How to use the -t option of Unix command look

I'm learning the look utility and I don't understand the meaning of the -t option. Can someone show me some examples of it? I read the man page, but still don't know what it exactly means.
3
votes
2answers
4k views

Why is 'df' hanging?

I have recently been having problems running df, where it just hangs. Here's strace output, and in it, you'll see that I killed since it was just sitting there: $ strace /bin/df execve("/bin/df", ...
3
votes
2answers
97 views

Unatended script execution in ubuntu terminal

I have installed Ubuntu on a VMWare virtual machine. When I got to installing a VMWare tools, I have stumbled upon a simple question: If I execute a script (perl script in VMWare tools case), is ...
6
votes
2answers
455 views

What commands have -h human readable option, and how can I enable it by default w/env variable?

I'm tired of using aliases or typing -h. I want human readable output 24/7. Is there a way to enable it all the time for all commands that offer it?
5
votes
1answer
135 views

How would one detect if external command exists in a script?

Is there a way to detect if an external command exists (i.e. wget, svn)? More specifically today, i was trying to run one of my scripts i wrote and the person didn't have wget or svn installed. The ...
0
votes
0answers
29 views

Problem with calling program from the command line [closed]

Note: this is a cross post with this post on SO. I am trying to build a command line wrapper in Python 3 for an exiting command line tool called 'spooky' and I am having a hard time understanding ...
0
votes
1answer
157 views

Listing only the files in a folder and inside its subfolders

Is there a linux command for getting only the files in a folder and inside its subfolders? I have used the find command, but it is displaying all the files and folders. I am executing this shell ...
3
votes
2answers
175 views

ln gives different results when run multiple times

I have this simple script to use with seventh sense (it's a lone wolf gamebook reader/player): #!/bin/bash GAME_PATH=$(dirname "$(readlink -f "$0")") SEVENTH_SENSE_PATH=$(echo ...
5
votes
1answer
393 views

Can hd and od replace each other?

hd and od are both dump viewers of binary content. Can hd be used wherever od is and vice versa?
1
vote
0answers
273 views

Validating an OpenSSL Cipher List

Are there any tools that can validate an OpenSSL cipher list both syntactically and semantically? For example, ALL:!LOW:!SSLv2:!EXP:!aNULL is both syntactically and semantically valid cipher list. On ...
1
vote
3answers
514 views

How to determine which executable on my path will be run?

I run which and get the following, brendan$ which python /opt/local/bin/python brendan$ which -a python /opt/local/bin/python /usr/bin/python brendan$ ls -l /opt/local/bin/python lrwxr-xr-x ...
1
vote
1answer
406 views

Good “progress bar” about md5sum checking progress?

I'm using this right now: time md5sum -c *.txt | pv | grep -v ': OK$' but aren't there any smart solutions that can list that how many files haven't been checked? I mean I have many md5sum's in ...
15
votes
4answers
7k views

Usage of dash (-) in place of a filename

For a command, if using - as an argument in place of a file name will mean STDIN or STDOUT. But in this example, it creates a file with the name -: echo hello > - How can I make - in this ...
4
votes
3answers
402 views

General specification for command line interface

I was wondering where I can find and learn some general idea about the command line interface used in Linux and bash? As to now, I have found pieces of such information only from experience, such as ...
2
votes
2answers
14k views

How do I get UUENCODE to work?

I have a server that I have inherited that has an older version of Redhat installed due to software requirements and now there is a need to use UUENCODE to allow email attachments. The uuencode and ...
3
votes
1answer
110 views

Colour problem when capturing a png of the top panel of the screen

I want to capture a window as a png from within a bash script, using the window's ID. In this case, the window is the top panel.  Using gnome-screenshot the colours are true, as per this image... ...
4
votes
5answers
6k views

How do I find the X window ID under the mouse pointer in bash?

From a bash script, is there some way to get the ID of the X window under the mouse pointer? (edit) I need the process to be non-interactive.
3
votes
2answers
154 views

Why do I get a 'conformability error' when I attempt to convert water in GNU units?

I've been using the GNU units program and I seem to think that I should be able to convert water between a volume and a weight. Examples: You have: 1 gram water You want: cm^3 conformability error ...
4
votes
6answers
18k views

Console tool to test internet bandwidth

I'm looking for a tool that will test my internet connection bandwidth and create an simple report like speedtest does. Do you know some program/tool that do this? Something with CentOS packages ...
5
votes
2answers
1k views

Combine input from multiple files/pipes without clobbering lines or blocking?

Is there a tool that will take input from multiple files or pipes and write it to stdout, without blocking on reads, such that individual input lines come out intact? I basically want to multiplex a ...
11
votes
2answers
1k views

Is '-9' a flag to kill command?

What does -9 do? It does not show up in the syntax: $ kill kill: usage: kill [-s sigspec | -n signum | -sigspec] pid | jobspec ... or kill -l [sigspec] $