Questions tagged [gnu]

GNU Project is a free software, mass collaboration project. The founding goal of the project was, in the words of its initial announcement, to develop "a sufficient body of free software [...] to get along without any software that is not free.

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grep everything up until and including a pattern

Let's assume I have a log file that contains exceptions as shown java.lang.NullPointerException blabla ABC.Exception blalabbla dogchacecat.Exception yadayada I want to be able to output each line ...
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5answers
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Subtract time using date and bash

All the other questions on the SE network deal with scenarios where either the date is assumed to be now (Q) or where only a date is specified (Q). What I want to do is supply a date and time, and ...
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1answer
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Add (true || … ) to a function using sed

I quickly want to patch a huge library by adding true || in front of every function call. Example input: if function_a(some_parameters) && function_b would turn into if (true || function_a(...
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2answers
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How can sed replace in the range of nth line regex specified?

I am to replace using sed the 3th (or nth to be more general) occurrence in respective line with specified match regex. so far as i can is only to do the first: $cat file # Golden dictionary is a ...
15
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1answer
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Any way to have a “verbose mode” or “debug mode” with sed?

Is there a way to make gnu sed be verbose about what is run and what is done ? I'd like to have something like a "debug mode" so that I can see - for each line of input - the content of the hold space ...
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How to avoid printing a newline when seq completes?

To create a column header, looking like: 1234567890123456789 I (am trying to) use seq and echo: seq -s '' 1 9 ; echo -n 0; seq -s '' 1 9 However, seq outputs a newline after each run. How can I ...
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0answers
66 views

Why doesn't Guile have /usr/local in path?

I've noticed when compiling and installing modules for Guile in /usr/local that they cannot be found, while setting the prefix to /usr they work as intended. Is there a reason why Guile doesn't have /...
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1answer
110 views

what used to lead /bin being full and creation of /usr/bin?

I am and was reading https://lwn.net/Articles/773342/ where the current move of migrating whole lot of filesystem from /usr/$something to simply /usr . Some of the comments again and again comment on ...
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2answers
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Gnu Sed: Space Character class not matching for end of line character

Pattern: abc followed by space or is the last character in a line. orig="abc[[:space:]]+"; new=Hello sed -i -r -e "s|${orig}|${new}|g" ./file ; File: abc abcd abc abc d After executing: abc abcd ...
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1answer
726 views

Bash Conditional String and Integer together

I am trying to do both integer and string comparison in a statement as follows: $ TimeHr=$(date +%_H) $ Time=Night $ echo TimeHr 1 $ if ((TimeHr>18 || TimeHr<5 )) && [ Time == "Night" ]...
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2answers
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Awk or Sed: If pattern is found: delete line && export variable

In my bashscript I want Sed to find debug: Debug in a file ${SourceP} and if found delete that line and export to the environment Debug=Debug sed -i '/debug: Debug/,+0 d' ${SourceP} && export ...
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1answer
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Why does `xargs -n ` on SmartOS (SunOS) behave differently than other implementations?

It seems the -n option on the xargs found in SmartOS (and I assume Solaris) does not behave like any other version of xargs I've encountered. Take this example: Builtin /usr/bin/xargs (odd behavoir):...
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1answer
475 views

Array inside an Array: Different syntax for Array in bash

I found the following example from here. But I can't understand how is array arr is being defined. a='domain.de;de;https' $ arr=(${a//;/ }) What is the advantage of defining it like this? Actually, ...
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1answer
336 views

What is the predefined order in which man searches sections? [duplicate]

The description of man in its own man page contains the statement, The default action is to search in all of the available sections following a pre-defined order ("1 n l 8 3 0 2 5 4 ...
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1answer
635 views

GNU coreutils and GNU Bash [closed]

I confused with GNU coreutils and GNU Bash, I have installed Bash GNU Project - Free Software Foundation, Should I install Coreutils - GNU core utilities How could I distinguish them?
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2answers
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Makefile and .ONESHELL

When .ONESHELL is not used Makefile executes each shell commands in a separate shell. What is the benefit of this? Why doesn't makefile uses the same shell?
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1answer
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GNU coreutils need suggestions [closed]

Can anyone please suggest me some book or website from where I can learn about gnu coreutils to get more knowledge about terminal commands. An interactive book or website would be a nice start.
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Difference between find and GNU find

Consider some common *nix systems (say Debian, CentOS, Arch and Kali). I always used find; I don't recall using GNU find, but from one example I've seen I assumed the syntax of GNU find might be ...
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2answers
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Find a list of files that contains a set of consecutive lines defined in another file

I have a Reference file that contains a b c d I have to check all files in a subfolder recursively that contains all the lines of Reference file consecutively and delete those files. For example, ...
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0answers
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Ulimit not respected in GNU bash OSX

I am seeing a strange issue with gnu bash in OSX. The value of ulimit -f is being changed by the bash itself. Small reproducible code: #!/usr/local/bin/bash ulimit -f 1 echo "Value: $(ulimit -f)" ...
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2answers
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Sed with Character class [^[:space:]] not getting recognized

I used following sed with character class [^[:space:]] as follows: orig="(\`\`\`)([^[:space:]]*)"; new="\1{.\2 .numberLines startFrom=\"1\" .lineAnchors}"; sed -i -r -e "s|${orig}|${new}|g" ${...
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1answer
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Makefile: Copy using make variables --> error; Not so without variables!

In the following makefile InputLocation:=./Test OutputLocation:=$(InputLocation)/Output Input:=$(wildcard $(InputLocation)/*.md) Output:=$(patsubst $(InputLocation)/%, $(OutputLocation)/%, $(Input:...
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1answer
39 views

Pass a Make variable to Bashscript that is invoked from inside Make

In a pattern rule I would like to export make variable like $(TargetLocation), $@. I tried the following but It didn't get exported. The bash script is executable. export $(TargetLocation); \ export ...
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3answers
106 views

Find command that excludes paths listed in a file

I need to exclude a bunch of paths from a find command. For example: find "$(pwd)" -not \( \ -path "*/.git"\ -o -path "*/.git/*"\ -o -path "*/.vscode"\ -o -path "*/.vscode/*"\ -o -path "*/...
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3answers
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How to search for a match, then a non-match on that line, but include context lines for matched line?

Say I have a file containing: ⟫ cat schema.rb create_table "things", id: :serial, force: :cascade do |t| t.string "other_column" # ... t.datetime "created_at" end create_table "...
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2answers
940 views

Are there any successful forks or refactors of the Linux Kernel?

A google search reveals this slashdot story yielding this github repository that hasn't had a commit since 2016. There are 22,602 forks listed on github.com but these are going to be mostly (if not ...
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1answer
55 views

Can chmod on a directory without --recursive change who can read a file within that directory? [duplicate]

Based on the suggested duplicate, let me reformulate my question: If chmod 0660 path/to/folder is run, and user A isn't in the relevant group, could user A still read /path/to/folder/file.txt if that ...
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2answers
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Why is ddrescue slow when it could be faster on error free areas?

This question addresses the first pass of ddrescue on the device to be rescued. I had to rescue a 1.5TB hard disk. The command I used is: # ddrescue /dev/sdc1 my-part-img my-part-map When the ...
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2answers
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Signal the end of option arguments: double dashes `--` vs single dash `-`? [duplicate]

I notice in https://unix.stackexchange.com/a/459007/674, that single dash - is used to signal the end of option arguments. Is it correct that double dashes -- can also signal the end of option ...
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1answer
655 views

Is sort -k1,2 equivalent to sort -k1,1 -k2,2?

I'm experimenting with GNU sort and LC_COLLATE="en_US.UTF-8". I have a file called 'test': 1,0 1 10 2 1,0 3 10 4 With sort -k1,2 as well as with simple sort test the order doesn't change: $ sort -...
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0answers
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Changing a partition size without affecting the booting

I have Kali linux installed with dd on a couple of drives, they all have live persistence enabled with one acting as LUKS encrypted one (sdb3) (the one I'm using) and the other one is without ...
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2answers
369 views

Split file into 4 chunks using macOS version of split package

In GNU/Linux in order to split file into 4 equal chunks we can do something like: split temp -n 4 PREFIX_ But seems like the macOS' BSD version of split utility doesn't have -n option. What would be ...
4
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1answer
151 views

Safely define an environment variable

AFAICT, neither GNU Bash, nor any other relevant package (e.g. GNU coreutils) that is commonly available in GNU/Linux distros, has a ready-made way to define an environment variable such that the ...
2
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1answer
192 views

Where is “gcc_tooldir”

Under Cross-Compiler-Specific Options, it says: The default value, in case --with-sysroot is not given an argument, is ${gcc_tooldir}/sys-root. but it appears that gcc_tooldir is not defined. Is ...
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3answers
5k views

How can I partially serialize with GNU make

When I have a make task where a specific target needs to be made before another, while in parallel mode, this is simple when using SunPro Make (dmake). The following makefile: install: dir dir/file ...
2
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1answer
3k views

GNU Pattern Match and replace exact number of characters

This question may have been listed but I was not able to find one exact hit. I am trying to skim through a file, match a pattern and replace it with something else. However there are other ...
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0answers
112 views

Why BSD grep is not returning all the results, but GNU does? [duplicate]

Given the file with numbers from 1 to 100 (seq 1 100 > dataset.txt), and the pattern file with numbers from 1 to 20 (seq 1 20 > patterns.txt), I would like to to print all exact matches from ...
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0answers
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GNU Samba server: check SMB version of exported and mounted shares

I have a NAS Zyxel NAS326 running on Linux acting as Samba server. I can't exactly say which Linux distribution, this is all I get from "uname -a": root@nas326:~# uname -a Linux nas326 3.10.39 #1 Fri ...
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2answers
63 views

What's $(MAKE) or ${MAKE} actually supposed to mean in make scripting language

What's $(MAKE) or ${MAKE} actually performing in entire make building process. is it invoking a process which is similar to sub-routine i.e. in simplest terms 'call a function', or is it starting a ...
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2answers
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Problem using xargs --max-args --replace with default delimiter

This works as expected: $ echo a b c | xargs --replace="{}" echo x "{}" y x a b c y This does too: $ echo a b c | xargs --max-args=1 echo x x a x b x c But this doesn't work as expected: $ echo a ...
1
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1answer
850 views

Are Unix's extended regex compatible?

Are Unix's tool regex fully compatible ? For instance, if I grep -oE "\$text *\( *([^)]) *\)", am I garanteed to replace the exact portion I got if I use sed -E "s/\$text *\( *([^)]) *\)/replacement/...
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1answer
117 views

Does the search tracking and Amazon information sharing attributed to Ubuntu part of Debian?

I understand from Richard Stallman in this video, made probably in 2012/2013, that Ubuntu isn't 100% free by the GNU organization definition of Free Software, as according to Stallman there, it "spies"...
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1answer
432 views

A strange problem when trying to install GNU MPFR

I'm trying to install GNU MPFR. I've downloaded the source, cd'd into it and typed ./configure, which goes through a load of checks (which are all okay, as far as I can see.) The problem occurs when ...
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2answers
3k views

How do I prevent gpg from including SHA1?

apt-get is complaining that signatures are invalid and that the InRelease file is not signed (see Using Centos to sign .deb packages for background). On the server, I have verified using gpg that ...
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2answers
246 views

Is tty like a OS without DE?

Can I use tty to call Media Player and watch a video? Or run a browser in it? Since tty is just a virtual terminal.
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1answer
195 views

Freebsd 11.1 issues with gnu m4 eval test fail

I am pretty new Freebsd user. As I am trying to install gnu m4-1.4.18, I get eval fail on eval test section: Checking ./189.eval @ ../doc/m4.texi:6405: Origin of test ./189.eval: stdout mismatch --- ...
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1answer
3k views

What does exactly does GNU make dep do?

I am trying to understand GNU Make and trying to understand some c code and GNU autotools. There's a folder let's say lib, with three subfolders and a makefile. lib ...libA ...---compile.sh ...---...
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1answer
2k views

Since when do the POSIX and GNU rm not delete /?

For several years now, the GNU rm utility won't delete / unless it is called with the --no-preserve-root option. However, the command rm -rf / has been lodged in the collective subconscious as ...
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0answers
59 views

macOS (BSD) vs GNU grep multiple pattern inconsistency [duplicate]

I am on macOS Sierra 10.12.6 $ grep --version grep (BSD grep) 2.5.1-FreeBSD $ ggrep --version ggrep (GNU grep) 3.1 Packaged by Homebrew Copyright (C) 2017 Free Software Foundation, Inc. License ...
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1answer
375 views

How can I add core GNU commands to a pre-existing AIX system?

In another thread (What's the easiest way to sort a list like this) someone asked if we had "GNU ls" on the system because it would provide a solution. We do NOT have GNU ls installed but it got ...

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