GNU Core Utilities are the GNU project's implementation of the core command-line tools of a POSIX system, including tools like ls, cp, mv, rm, etc.

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6
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129 views

How can I delete a file named “--append”? [duplicate]

By mistake I have created a file named : --append. How do I delete it? Simply entering the usual command, rm -f --append, doesn't work.
0
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0answers
37 views

Strange cut behavior

I'm using cut (GNU coreutils) 8.24. The command: echo "TEST=test" | cut -d"=" -f2- outputs Ttest. I don't think this is the intended behavior. Am I using it wrong or is there something wrong with my ...
23
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2answers
1k views

Why does ln -s accept a single argument

> cd /tmp > ln -s foo > ls -alhF /tmp lrwxrwxrwx 1 user user 3 Jul 29 14:00 foo -> foo Is this a bug in ln or is there a use case for symlinking a file to itself? This is with ...
4
votes
1answer
96 views

Is there a command line tool to manage unix signals?

Is there a command runner like env, nice, nohup, etc., that can run a program with modified signals? In my case, I need something to reset SIGINT to SIG_DFL. Why do I need this? Because ...
2
votes
1answer
226 views

sudo ls not showing hidden files on Linux

Today I discovered that sudo ls shows hidden files (that is, those that have names starting with .) on OS X. This surprised me so much that I asked a question about this behaviour, which I still find ...
6
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1answer
225 views

How does the “1 month ago” option in date command work?

I'm not sure if this gets the past date within the current day or if it only takes 30 or 31 days to it. e.g. If the current date is March 28th, 1 month ago must be February 28th, but what happen ...
3
votes
2answers
193 views

change file size format when using stat

The formatting character %s makes stat print the filesize in bytes # stat -c'%A %h %U %G %s %n' /bin/foo -rw-r--r-- 1 root root 45112 /bin/foo ls can be configured to print the byte size number ...
0
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1answer
61 views

cp options --no-clobber vs. --update

I want to copy a single file if (and only if) the destination does not exist. The source file changes rarely, maybe once a month. The destination almost never exists. Are there any differences ...
2
votes
1answer
141 views

what are practical uses of stdbuf or nohup?

I have to finish a writeup of a few coreutils commands for a course at the moment, and I can't think of a starting point for a small practical code example that demonstrates the potential uses of ...
0
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1answer
86 views

*ls* font differences between files and folders with “--color” option

I have recently switched to urxvt from xterm for better unicode support and it does much better as to the font fallback. However I find an interesting issue: names of files and folders are rendered ...
2
votes
1answer
96 views

How can I cross compile the dd linux tool for arm?

I need to cross-compile a full version of dd because my device only has a busybox one that doesn't support many options. Where do I get the source for it? I've been looking on the kernel repo online ...
2
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0answers
119 views

Installed coreutils on CentOS for sort --human-readable flag but it still doesn't work

I'm trying to do du -h | sort -h, but my CentOS 5.7 doesn't have -h flag for sort. So I installed coreutils Updated: coreutils.x86_64 0:5.97-34.el5_8.1 Complete! yet sort still doesn't have ...
1
vote
1answer
51 views

Difference between / and // [duplicate]

On the bash prompt one, three or more slashes (/,///,////, ...) are treated as a single slash, whereas two slashes (//) are left as is: 12:07 $ cd / 12:07 $ pwd / 12:07 $ cd // 12:07 $ pwd // 12:07 $ ...
18
votes
3answers
2k views

Why is coreutils sort slower than Python?

I wrote the following script to test the speed of Python's sort functionality: from sys import stdin, stdout lines = list(stdin) lines.sort() stdout.writelines(lines) I then compared this to the ...
0
votes
0answers
22 views

Set default editor for 'info coreutils' [duplicate]

I'm using Ubuntu 14.04 and have this in my .bash_profile: export EDITOR=/usr/bin/vim export VISUAL=/usr/bin/vim man respects this setting but info always opens in something else, nano or it's own ...
0
votes
1answer
118 views

Why can't my `date` deal with timezones? [duplicate]

I'm having some weird issues with GNU coreutils date v8.4 (CentOS) that aren't occurring in v8.21 (Ubuntu/Mint). On v8.4, I get the following output (I'm in PST): $ date --version | head -n 1 date ...
2
votes
1answer
151 views

Problem with install command to copy a whole directory

So I have a repo with some of my config files and I'm trying to create a makefile to install them in the homedir. The problem I have is that when I run the following command straight in bash install ...
0
votes
2answers
252 views

Permissions for installing coreutils with pkgsrc on NetBSD

I'm trying to install coreutils on NetBSD 6.1.5 using the pkgsrc system. This is on the default install of 6.1.5. The only change made has been to install zsh and set it as my default shell for users ...
2
votes
1answer
69 views

Where is using @ before a date string for seconds since the epoch documented?

GNU date and touch commands (and presumably others) use @date to define a date string as seconds since the epoch. For example: $ TZ=UTC date -d@10 Thu Jan 1 00:00:10 UTC 1970 I was answering a ...
2
votes
3answers
365 views

When was a file last opened?

How do I determine, when a file was last opened? I've looked at man ls (using GNU coreutils 8.22) and I don't see anything about this timestamp.
8
votes
2answers
720 views

sort by hex value

Using coreutils sort, how can I sort numerically by a hexadecimal value (field)? I was expecting something along the lines of sort -k3,3x file_to_sort however, such an x does not exist. Edit: ...
0
votes
2answers
65 views

Where can I view a changelog for the sort command

I need to find sort's version when the -V flag was introduced. But I am finding myself some hard time finding the changelog for this command. Where can I view it?
1
vote
2answers
104 views

numfmt invalid suffix input

I am using numfmt to convert a remote file's Content-Length from bytes to IEC format, i.e. 21M $ curl -sI http://jruby.org.s3.amazonaws.com/downloads/1.7.12/jruby-bin-1.7.12.tar.gz|grep Length|cut ...
1
vote
1answer
64 views

“install” command as script

I'm working on a heavily modified Linux based OS targeted for a really specific environment - easy-to-use NAS systems. It does not provide any GUI, apart from a web interface, but it at least has SSH. ...
8
votes
2answers
949 views

How is the order in which tar works on files determined?

$ touch dir/{{1..8},{a..p}} $ tar cJvf file.tar.xz dir/ dir/ dir/o dir/k dir/b dir/3 dir/1 dir/i dir/7 dir/4 dir/e dir/a dir/g dir/2 dir/d dir/5 dir/8 dir/c dir/n dir/f dir/h dir/6 dir/l dir/m dir/j ...
28
votes
3answers
2k views

What is the `[` program that resides in my system's /bin?

I was recently browsing my Fedora's /bin folder and noticed a binary named [. I did try to search the internet for more information on that, but I couldn't find anything useful. Running it through ...
4
votes
2answers
460 views

What does `du - hb` do?

With du -bh I think I get the apparent size in human readable format: # du -bh 295K ./test However, I would expect the same from du -hb, but I get something else: # du -hb 301926 ./test I ...
5
votes
2answers
4k views

Why is dd using direct slower writing to disk than to a file

I am trying to compare aggregate write rates when writing to a file in a GPFS file system, as compared to writing directly to a disk on a system with Red Hat Enterprise Linux Server release 6.4 ...
1
vote
1answer
72 views

Memory-efficient utility to return N first sorted values

I would like to implement a very popular MapReduce example using only existing programs operating in a UNIX way. The problem is to find N most frequent values in an enormous amount of data. The ...
4
votes
2answers
93 views

Off by 1 year error in GNU date?

Right now, 2014-01-06, GNU date 8.4 on CentOS release 6.4, does this: $ date --date "last week" +"%Y-%V" 2013-01 On the other hand, $ date --date "last week" +"%Y-%U" 2013-52 which is just ...
0
votes
2answers
283 views

How can I format the output of stat to contain the null character?

I want to delimit file paths by using the null character (NUL, \0, ...) just like for example find -print0 does. I'm using bash and I tried the following without success: find $1 -print0 > ...
0
votes
1answer
227 views

what does the following command do?

what does the following command do? I have tried to study the linux command but I could not find out what this command does. here is the command: touch finger ; finger touch
2
votes
3answers
6k views

cp --no-target-directory explained

Question: I need a simple example of how to use cp --no-target-directory. I do experience some difficulties in understanding cp --no-target-directory. I do understand the explanation for mv ...
3
votes
2answers
5k views

cp -L vs. cp -H

Problem When copying files with cp -H or cp -L, I get the same results: $ ls -l fileA fileA -> fileB $ cp fileA somewhere/ -H $ ls -l somewhere/ fileA # fileA is a copy of fileB, only ...
2
votes
1answer
52 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 ...
4
votes
3answers
3k views

convert soft- to hardlinks with cp

The cp command's infopage offers on the option --preserve= the following: links Preserve in the destination files any links between corresponding source files. Note that with -L' ...
3
votes
1answer
386 views

cp --attributes-only documented but not working “now”?

PROBLEM: cp --attributes-only Source Target results in two files unchanged, where the attributes from Source should be copied to Target. Attempts to solve: As I have the 8.13 version of coreutils ...
11
votes
3answers
721 views

/usr/bin/ptx: Can you provide a use case or two?

I was going through the list of files included in coreutils and I was able to come up with an example of how I could personally use all of the commands provided except for ptx. Can you give one or two ...
9
votes
4answers
8k views

Mac OS X: dircolors not found?

I just switched to a Macbook Air. I installed zsh using homebrew, but when I use some of the code that I (originally had) in my .zshrc, I get an error saying that .dircolors was not found. Below is ...
5
votes
3answers
803 views

What's the real point of the -f option on rm?

By reading the GNU coreutils man page for rm, one of the options is -f, which according to the manual, -f, --force ignore nonexistent files and arguments, never prompt Now, I made some ...
3
votes
1answer
11k views

Command to transpose (swap rows and columns of) a text file [duplicate]

Is there currently a generic command that will "pivot" input. e.g. #labeled.file name: bob title: code monkey name: joe title: pointy haired is converted to: name title bob code monkey joe ...
3
votes
2answers
455 views

See extended attributes with coreutils ls on Mac

I have coreutils installed via MacPorts on my Mac running OS X 10.8.4. I have ls set to use the coreutils version of ls [(GNU coreutils) 8.21] when available: if [ -e /opt/local/libexec/gnubin ]; ...
3
votes
2answers
203 views

Ignore blank keys in coreutils sort

How do you ignore or is there a way to change the sort order of empty keys when using sort -k? # cat afile a b 11 20 93 45 55 26 09 31 How can I sort the empty column b values at the bottom so it ...
1
vote
2answers
150 views

Checking compatibility between core utils and older GNU/Linux systems

I have non-root access to a grid of computers. The installed OS is the following: $ uname -mrs Linux 2.6.18-274.el5xen x86_64 $ cat /etc/*-release ...
2
votes
2answers
292 views

Is grep part of coreutils? (If not, why?)

I have read in a few websites that grep comes with coreutils (e.g. https://wiki.archlinux.org/index.php/Core_Utilities) However, after building them, I noticed that grep is missing. I wonder if I ...
4
votes
1answer
212 views

Behavior of `du` command with `-L` flag

I've noticed a strange behavior with du command when it's used with -L command line option. I'm using Slackware 14 and Coreutils 8.19. To reproduce the strange behavior, create two folders: mkdir ...
3
votes
1answer
122 views

Print arguments to printf in no particular order

How can I refer back to arguments to coreutil's printf in no particular order? This is what I want to avoid: $ printf '%s %s %s %s %s %s %s' a c a c b c a a c a c b c a This is what I would like ...
12
votes
4answers
2k views

Why is cp --reflink=auto not the default behaviour?

Why is cp --reflink=auto not the default behaviour? Could it cause any harm to enable it? Is it possible to enable it at compile time, so it is used all across the system, not just in interactive ...
1
vote
5answers
4k views

ls command - define number of columns

Is there a way to define the number of columns in ls output? I got this far: ls -C sorts in columns and ls -1 produces one column. --tabsize = option to produce two columns resulted in what looks ...
9
votes
3answers
9k views

How can I display octal notation of permissions with ls - and can octal represent all permissions? [duplicate]

After looking at the man page for ls on my system and searching Google, I see there IS a hack of way to use awk or perl to show octal permissions when using ls, but with bash is there anything more ...