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Questions tagged [utilities]

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

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10
votes
2answers
240 views

Why is there a mix of symlinks and hardlinks in /bin?

I understand the technical difference between symlinks and hardlinks, this is a question about their use in practice, particularly I'm curious to know why both are used in seemingly similar conditions:...
4
votes
2answers
1k views

tac command's option creates strange output [comprehension question]

Say I have this file, containing nothing but a b c b a Using tac --separator=a file in BASH [on a Debian based Linux], I get this: # empty line # empty line b c ...
4
votes
2answers
2k views

Where can I find some good documentation for bash printf?

man printf, info printf and printf --help are all pretty useless to me; I want an explanation of the FORMAT options. For example, I could use: printf '%s\n' foo bar and get output: foo bar From ...
4
votes
5answers
326 views

Standard unix util to split “foo.bar.baz” into “foo.bar” + “.baz”?

I want to split a string $basename, containing the output in two parts, $stem and $ext, such that: the string "${stem}${ext}" is identical to the original string $basename; either $stem or $ext may ...
0
votes
1answer
775 views

wc - setting a terminating character

I've got that far: wc --files0-from=FILE lets one get the word count of a list of files. Each entry in this list mus be terminated with an ASCII NUL character. Question: A way to set a terminating ...
1
vote
4answers
2k views

crash shell: any way to check if a command executed Successfully

I'm automating a test using crash package. Is there some thing like $?, which can be used to check if the previous command executed successfully or not inside a crash shell? For example, when ...
2
votes
1answer
541 views

Is there a text-only equivalent (no curses) of `zenity --question`?

For my mercurial commit hook, I want to run my test cases and be asked whether I really want to commit if any of the tests fail. I'm thinking something like <run-the-tests> || <ask-yes-no>...
4
votes
4answers
1k views

Decomposition of path specs into longest-common-prefix + suffix

Given any two absolute Unix path specs1, one could decompose each spec as the concatenation of a longest common prefix and a specific suffix. E.g., /abc/bcd/cdf -> /abc/bcd + cdf /abc/bcd/chi/...
1
vote
1answer
447 views

Is Mac OS X really SUS compliant?

Internet says that Mac OS X 10.8 has achieved certification to The Open Group UNIX® 03 standard and that it is a compliant system. But a simple test with echo seems to indicate otherwise:  a) The ...
1
vote
1answer
734 views

lspci machine-readable format (-vmm) does not show a kernel Module/Driver line

I briefly read the manual of lspci, where I found out that there is a machine-readable format lspci output using "-m" or "-mm" or "-vmm". I need to print out the device name, the device id and the ...
1
vote
1answer
933 views

Install vmware-tools using yum in vmware fusion

I added vmware-tools repo [1] to my virtual CentOS box. What is the exact set of packages I have to install? The rationale is to be able to update vmware-tools using yum. Environment: Host OS: Mac ...
3
votes
3answers
3k views

ASCII art generator

I'm looking for an ASCII art generator (text is preferred, but images will do too) in the sl style, but with text instead of trains. Any suggestion?
1
vote
1answer
6k views

using tr -t command [comprehension question]

When using tr -t command, string1 should be truncated to the length of string2, right? tr -t abcdefghijklmn 123 # abc... = string1, 123 = string2 the cellar is the safest place # actual ...
1
vote
3answers
6k views

How to check which process is using a given file descriptor?

Somewhere in the middle of my application, the framework I'm using (ROOT) gives me the following error: *** Break *** write on a pipe with no one to read it SysError in <TUnixSystem::UnixSend>:...
4
votes
1answer
151 views

Determine monthly internet transfer to detect right FUP

I live in a country where many ISP (internet service providers) have FUP (fair use policy, limit on amount of data transferred). I need to get a new connection and I would like to measure how much ...
4
votes
0answers
1k views

Are there any tools to test MTD/JFFS2 for Linux 2.4 kernels

I have some issues with a platform I support and I suspect memory problems. I wanted to check the Flash parts using some MTD JFFS2 test tools, I found a link to a bunch on this site. However they ...
2
votes
1answer
227 views

How to change the current directory graphically using the keyboard only?

There was a program named NCD (Norton Change Directory) a few years ago that did a good job at helping me change directory back in the DOS days. This programs displayed a tree, and you could navigate ...
4
votes
1answer
5k views

Where does the “export” command come from?

Why doesn't the whereis command give any information about the export command? How does the export command work even if the shell path variable is set to null?
14
votes
2answers
6k 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] $
1
vote
2answers
654 views

Clear the screen and show a banner

I need a text banner on a screen which is projected all the time. The screen is connected to a PC with tmux on it. Example of text "banners": figlet $(fortune) or toilet "$(cowsay $(fortune))" ...
1
vote
1answer
2k views

Change Directory and List Files [duplicate]

Possible Duplicate: Make cd automatically ls I think that it would be very useful to have a unix utility that combines 'cd' and 'ls' so that when you change your directory, it automatically lists ...
9
votes
3answers
606 views

Doing two things with output from a command

I have a program texcount that outputs the number of words in my LaTeX document. I can also pipe the output of this to sed to make the newlines TeX linebreaks and write this to a file which I can then ...
3
votes
1answer
157 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... (...
3
votes
2answers
260 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 ...
23
votes
4answers
2k 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 ...
13
votes
2answers
557 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 ...
0
votes
3answers
211 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, ...
1
vote
3answers
371 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
3
votes
1answer
5k 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
4answers
722 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 ...
4
votes
2answers
836 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 ~)"/.wine/drive_c/users/...
4
votes
3answers
3k 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
1answer
1k 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 ...
2
votes
1answer
2k 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 "s/&...
4
votes
2answers
4k 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
116 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 there ...
3
votes
1answer
2k 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 ...
3
votes
1answer
2k 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
128 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
112 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 ...
5
votes
1answer
173 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
30 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
995 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 ...
4
votes
3answers
2k 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
1k 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 .txt ...
3
votes
3answers
1k 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 ...
1
vote
3answers
394 views

Sort data on multiple columns

INPUT (unsorted, bad) "XYZ-ZTE-43255 serverB618 agreed","XYZ-ZTE-44432" ,"XYZ-ZTE-43255" "XYZ-ZTE-52775 serverB110 agreed", "XYZ-ZTE-79213 - serverB688 agreed", "XYZ-ZTE-77323 serverB617 agreed", "...
4
votes
2answers
557 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 ...
1
vote
1answer
5k views

e2fsck progress bar?

How can I see the progress of e2fsck in the terminal? Are there any pv like ways? For example how can I see how far along this command is in progress: e2fsck -f -y -v /dev/sdb1
4
votes
2answers
2k views

Why is bash completion of a symlink different than a directory?

I usually do a find with an environment variable as the path when searching for source code. Recently I replaced my environment variable with a symbolic link, and it broke Bash's shell completion. ...