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

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4
votes
2answers
93 views

Convert file with integers written in ascii to binary file of integers

I have a file that contains a long list of integers written in ascii separated with newlines, like such: -175 2 -19345 345592 -45 2355 etc... I want to convert this file into a "binary" file ...
9
votes
3answers
211 views

Store output of a command into a ring-buffer

I've got a long-running command that generates a lot of output on stdout. I'd like to be able to retain, for instance, only the last three days or the last gibibyte (avoiding cutting lines in the ...
3
votes
0answers
43 views

What are good document organization utilities?

I'm a graduate student and I have to deal with reading a lot of academic papers. I was wondering if there were any good utilities for linux for organizing documents (pdfs mostly) for reading. Having ...
4
votes
2answers
89 views

Factor is too large

I'm trying to use a factor utility but it tells me that number is too large. Is there any utility that can do what factor doing but not tells that number is too large?
0
votes
0answers
46 views

Tools to inspect local network, and find local IP address of device?

This is my specific context (Latex/TikZ code for the diagram below): Now this local "Router", has broke down several times, and several different devices have had its role (sometimes they have a ...
2
votes
1answer
87 views

alternative for digest -a sha256 command from solaris in linux

I have file from solaris which have digest -a sha256. But this command is not working in linux. I want the alternative for this command.
0
votes
1answer
324 views

What does chmod stand for?

In order to memorize a command, it is usually a good idea to learn where it's name comes from. For example, cp comes from copy. usermod means "User Modifiy" (at least I guess so). Where does chmod ...
1
vote
1answer
68 views

On why touch, mv, etc., won't create subdirectories “as needed”

There are many Unix commands that will fail unless some subdirectory already exists, even though it would be a trivial matter for such commands to go ahead and create the missing subdirectory before ...
-5
votes
1answer
67 views

What does -p do when creating directories

What does the following command do to my system? $ mkdir -p /tmp/aes I typed the following command into my command line and it executes as expected. I know the folder is created as when I attempt ...
2
votes
2answers
170 views

How can I get the version of the pgrep & pkill commands?

I looked at the manpages and there is no -v or --version argument for pgrep or pkill. How can i get some info on the version? I'm asking because on my version of Ubuntu man pgrep is giving me a ...
2
votes
2answers
79 views

Tool to force use FILE instead of RAM

I'm wondering why there is no such tool like ram2swap, similar to cpulimit in parts. E.g. There is program daemon.bin. Let's create temporary swap file ( 1 Gb ): % dd if=/dev/zero of=tmp.swap ...
0
votes
3answers
51 views

How to find the difference in tokens in two strings using Unix tools?

I have two strings as below- token1, token2, token3, token4, token5, token6, token8, token9, token10 token2, token7, token4, token3, token5, token6, token8, token10, token9 Visually, I can see ...
1
vote
4answers
69 views

What are considered utilities and applications?

Commands like cp, ls, chmod, pwd etc are called as utilities. I seem to not able to define what kind of things are called applications. Let's abandon GUI to make the definition more precise.
7
votes
1answer
59 views

Swap (exchange) two big files in limited environment

Let's say I have two flash memory devices 1GB capacity each. Let's also say each device contains one big file ~ 1GB size. Assuming, I have limited (64MB) RAM and no hard disk drive, what is the ...
1
vote
0answers
84 views

List/query Open X11 Display Connections?

I am hitting this bug: NEWT errors when closing sketch on Linux · Issue #1651 · processing/processing · GitHub, when using Processing on Linux (Ubuntu 11.04); my messages are: X11Util.Display: ...
1
vote
3answers
53 views

Use Unix tools to look for a definition block in an XML.

I am using an XML that has definitions in this form - <definition name="ticketOpen" extends="ticketUpdate"> <put name="title" value="Open Ticket" /> <put name="mainForm" ...
1
vote
1answer
25 views

Utility to tag regions of audio files

For example, say I have a recording with lots of noise and people speaking, I'd like to tag areas where people are speaking with a 1, and by default everywhere else is 0. Then save this file ...
0
votes
3answers
80 views

running an executable in parallel by dividing the input directory tree

Commands like find and grep would benefit greatly if they were to run in parallel. Is there a utility or a program that takes a command as an argument and makes it run in parallel by running multiple ...
0
votes
0answers
92 views

Video tools for creating presentation

I have captured video (with audio) from presentation, slides (just images), and array of times (when slides was listed). Goal is to create presentation video: big slide with small video frame at the ...
0
votes
0answers
117 views

What's the problem with fsck.ext3?

It seems there is some problem with my HDD in my satellite box. The box records to and plays video from the HDD, but occasionally it hangs (it was stable before). It's Linux version ...
20
votes
2answers
698 views

Why use install rather cp and mkdir?

I've seen in many places used install -d to create directories and install -c to copy a file. Why not use mkdir and cp? Is there an advantage in using install?
29
votes
3answers
2k views

What is the point of the `yes` command? [duplicate]

This question concerns the yes command found in UNIX and Linux machines: Basically, what is the point (if any) and history of this tool? Are there practical applications for it? Can an example be ...
1
vote
3answers
1k views

Count tabs per line in text file with utils

I have a tab-tabulated file. I would like to check if every line has the same number of tabs. For first step, I'd like to print the number of tabs for each individual line. I've tried grep -o '\t' ...
2
votes
2answers
67 views

Is there a distribution-independent tool to autocompile+install dependencies?

I like the way e.g. ArchLinux' yaourt (or if you're not that lazy, abs+makepkg; and from what I read so far, Gentoo's ebuild as well) automatically take care of obtaining, compiling and installing ...
2
votes
2answers
97 views

When do `sort -k 2,3b` and `sort -k 2,3` differ?

The POSIX description of the -b flag for the sort command is Ignore leading characters when determining the starting and ending positions of a restricted sort key. I can understand the use for ...
5
votes
1answer
303 views

`unbuffer` or `stdbuf` for removing stdout buffering?

Is there a difference between unbuffer(1) and stdbuf(1)? From what I gather, unbuffer makes more than the "best effort" of calling the libc function set(X)buf at the beginning, and then letting things ...
2
votes
1answer
48 views

Checking the order of items in a shell environment variable

I am wanting to check that a certain directories always appear after other directories in an environment variable. List items are separated by a colon, as with the PATH variable. This is not simply ...
7
votes
2answers
118 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 ...
2
votes
1answer
300 views

Is there any tool to view live statistics about a Radeon GPU?

I've checked out GPU usage monitoring (CUDA), but are there similar tools for AMD/ATI cards? Or kind of universal tools? I want to check out if my applications use the 256 MB of RAM of the video card ...
2
votes
2answers
428 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
195 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
108 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
525 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
124 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> || ...
1
vote
1answer
142 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
400 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 ...
-1
votes
1answer
431 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 ...
3
votes
2answers
225 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 ...
9
votes
3answers
912 views

Universal extractors

With an increasing number of archive/compression file formats, is there a single free/open-source command line tool to rule them all? Perhaps something with a consistent / unified set of flags? (note ...
1
vote
3answers
907 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 ...
1
vote
3answers
823 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?
4
votes
1answer
90 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 ...
3
votes
4answers
314 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 ...
1
vote
1answer
285 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 ...
0
votes
1answer
226 views

Is expect tool availabe for ARM platform

I need to get expect (tool for automating interactive applications) for the ARM platform. Is it a readily cross compiled to ARM and is it available? I tried googling but was unable to get the ...
2
votes
0answers
425 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
945 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?
2
votes
3answers
2k views

touch: cannot touch file: No such file or directory

I am getting the error: touch: cannot touch `/opt/tsrm/compliance/cme/log/20121207.log`: No such file or directory on the touch command: touch $LOGFILE I also checked the link: touch: cannot ...
1
vote
1answer
126 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 ...
2
votes
2answers
251 views

Is there a good FOSS utility for converting machine code to assembly or even C?

If I buy a piece of x86 32-bit or 64-bit software but I don't receive the source code, and I need to modify the software, I'll need to convert the machine code back into a high level language or at ...