Unix & Linux Stack Exchange is a question and answer site for users of Linux, FreeBSD and other Un*x-like operating systems. Join them; it only takes a minute:

Sign up

Here's how it works:

Anybody can ask a question
Anybody can answer
The best answers are voted up and rise to the top

Top Questions

active 11 featured hot week month

0

votes

0

answers

13

views

how to boot linux kernel from USB?

usb

asked 1 hour ago emddev 66

2

votes

3

answers

23

views

sort letters in a single word - use it to find permutations (or anagrams)

sort words

modified 29 mins ago iruvar 9,502

3

votes

1

answer

56

views

Meaning of '2> >(command)' Redirection in Bash

bash shell-script io-redirection

answered 3 hours ago Eric Renouf 8,288

0

votes

0

answers

12

views

how to encrypt raid 1

rhel luks cryptsetup raid1

modified 49 mins ago Jeff Schaller 11.1k

2

votes

2

answers

28

views

grep the man page of a command for hyphenated options

grep man options

modified 1 hour ago Wildcard 12.1k

27

votes

7

answers

5k

views

What's the fastest way to generate a 1 GB file containing only random numbers?

linux files random

modified 4 hours ago James Hollis 11

0

votes

1

answer

21

views

cut with variable used to provide column to cut [on hold]

text-processing cut

modified 2 hours ago tomas 3,033

0

votes

2

answers

20

views

Break out of while loop on error

bash shell-script

answered 1 hour ago Wildcard 12.1k

1

vote

3

answers

21

views

Find all files, create CSV with one row per subdirectory and file names in collumns

command-line files csv

modified 2 hours ago Wildcard 12.1k

-1

votes

2

answers

28

views

How to use awk and print 3rd column that contains both 'db2' and 'SAP' strings?

text-processing awk

answered 1 hour ago Wildcard 12.1k

0

votes

0

answers

11

views

-fstack-protector-strong available but compiler is broken while compiling kernel using gcc

kernel linux-kernel make gcc

modified 3 hours ago tomas 3,033

0

votes

0

answers

11

views

Can't write to file system even though there is free space as said by df -h

ubuntu filesystems disk-usage

asked 3 hours ago KillBill 101

2

votes

0

answers

19

views

Consistently high but decreasing ping behavior on ubuntu machine

ubuntu networking ping

modified 1 hour ago Matt 31

1

vote

2

answers

34

views

Extracting string up to first digit in Bash

bash shell-script string

answered 2 hours ago sorontar 1,214

0

votes

1

answer

29

views

Convert from comma to Column (sed)

sed csv columns

answered 7 mins ago Wilfredo 11

1

vote

0

answers

12

views

Linux Not Performing Sync on Reboot

linux filesystems cache reboot

modified 4 hours ago roaima 20.5k

61

votes

3

answers

6k

views

What does the letter 'u' mean in /dev/urandom?

linux devices history random

answered 10 hours ago bbneo 1

0

votes

1

answer

44

views

Only allow SSH incoming and outgoing

ssh firewall ssh-tunneling

modified 5 hours ago roaima 20.5k

1

vote

2

answers

25

views

Why a value of a variable doesn't change inside backticks?

shell variable command-substitution variable-substitution

modified 4 hours ago Gilles 378k

1

vote

0

answers

13

views

Restrict log file size

io-redirection

asked 5 hours ago Eric 113

7

votes

1

answer

204

views

How do I reliably find the full path of a program on the PATH?

shell path

modified 9 hours ago Zachary Brady 2,499

1

vote

1

answer

12

views

Why does “rxvt -font x” give me an error, but a “better” font than plain “rxvt”?

fonts rxvt

answered 2 hours ago Thomas Dickey 35.4k

1

vote

0

answers

22

views

How to change the first line only on certain files in a folder using sed

sed windows

modified 5 hours ago paulo_setar 6

1

vote

1

answer

11

views

What does status_of_proc mean by bracket-points-bracket?

shell-script init.d

answered 3 hours ago Gilles 378k

2

votes

1

answer

21

views

Join two files each with two columns that have multiple columns are matched

text-processing join

answered 5 hours ago Göran Uddeborg 376

2

votes

2

answers

16

views

Replace string in multiple files using find and sed

sed find recursive replace

answered 6 hours ago Göran Uddeborg 376

1

vote

1

answer

25

views

Can I track down where a SIGINT came from if it's not from a user?

linux signals debugging

modified 4 hours ago Gilles 378k

3

votes

4

answers

205

views

How to install debian package manager into embedded system?

debian package-management

answered 2 hours ago Gilles 378k

0

votes

2

answers

12

views

“dnf install vidalia” on Fedora Core 24?

dnf tor vidalia

answered 5 hours ago barrycarter 402

1

vote

1

answer

28

views

Splitting files in Unix using values in a file

text-processing awk xml

answered 5 hours ago scottbb 135

1

vote

1

answer

15

views

sed match word1 and word2 to get word in between

sed awk regular-expression

modified 5 hours ago Zachary Brady 2,499

1

vote

1

answer

28

views

Count number of values within a range in a specific column

linux text-processing numeric-data

modified 7 hours ago Jeff Schaller 11.1k

0

votes

1

answer

20

views

xclock with nanosecond (or fractional second) resolution

time clock

modified 7 hours ago thrig 9,040

1

vote

0

answers

22

views

cURL and wget cannot resolve hosts, but apt-get works

ubuntu networking virtualbox wget curl

modified 7 hours ago Jeff Schaller 11.1k

1

vote

0

answers

12

views

TCP: One PC can connect to other's listening port but not vice versa

networking tcp socket netcat

asked 7 hours ago Rextuz 27

0

votes

1

answer

21

views

While comparing integer, string and binary in bash, which enclosing quotes (single or double) should I use and why?

shell quoting

modified 6 hours ago IanC 441

0

votes

1

answer

11

views

Can I have Linux open a template file when I create a new file with a certain extension? [on hold]

files template

answered 7 hours ago DepressedDaniel 13

1

vote

1

answer

15

views

Apache query string rewrite not working

apache-httpd proxy mod-rewrite

modified 5 hours ago smokes2345 449

0

votes

1

answer

21

views

Application layer firewall on UNIX machines

firewall

answered 9 hours ago blissini 136

0

votes

1

answer

12

views

How to get rid of an unwanted input repeating belt?

ubuntu lxde

answered 9 hours ago tomas 3,033

1

vote

0

answers

29

views

How can I bypass Fedora's password complexity requirments?

fedora pam passwd

modified 10 hours ago Seth 737

3

votes

0

answers

28

views

ld cannot find existing library

symlink ld

modified 8 hours ago Arthur McKnight 116

3

votes

2

answers

22

views

fold and text columns

text-processing character-encoding

answered 3 hours ago Gilles 378k

1

vote

1

answer

21

views

Running a Solaris binary on SPARC without SPARC hardware

solaris emulation sparc

modified 8 hours ago Jeff Schaller 11.1k

0

votes

1

answer

32

views

How do I store bash env vars in array then access/modify?

bash environment-variables array

modified 12 hours ago Stéphane Chazelas 183k

1

vote

1

answer

25

views

zero knowledge encryption

security encryption webserver certificates cryptography

modified 11 hours ago Stephen Kitt 47.1k

2

votes

0

answers

14

views

Why is apache reporting “client denied by server configuration”?

fedora apache-httpd apache-virtualhost

modified 10 hours ago Kev 558

Looking for more? Browse the complete list of questions, or popular tags. Help us answer unanswered questions.

hot questions feed

Technology				Life / Arts		Culture / Recreation		Science		Other
Stack Overflow Server Fault Super User Web Applications Ask Ubuntu Webmasters Game Development TeX - LaTeX	Software Engineering Unix & Linux Ask Different (Apple) WordPress Development Geographic Information Systems Electrical Engineering Android Enthusiasts Information Security	Database Administrators Drupal Answers SharePoint User Experience Mathematica Salesforce ExpressionEngine® Answers Cryptography	Code Review Magento Signal Processing Raspberry Pi Programming Puzzles & Code Golf more (7)	Photography Science Fiction & Fantasy Graphic Design Movies & TV Music: Practice & Theory Seasoned Advice (cooking) Home Improvement Personal Finance & Money	Academia more (8)	English Language & Usage Skeptics Mi Yodeya (Judaism) Travel Christianity English Language Learners Japanese Language Arqade (gaming)	Bicycles Role-playing Games Anime & Manga Motor Vehicle Maintenance & Repair more (17)	MathOverflow Mathematics Cross Validated (stats) Theoretical Computer Science Physics Chemistry Biology Computer Science	Philosophy more (3)	Meta Stack Exchange Stack Apps Area 51 Stack Overflow Talent

site design / logo © 2016 Stack Exchange Inc; user contributions licensed under cc by-sa 3.0 with attribution required

rev 2016.11.17.4216

Linux is a registered trademark of Linus Torvalds. UNIX is a registered trademark of The Open Group.
This site is not affiliated with Linus Torvalds or The Open Group in any way.

Unix & Linux Stack Exchange works best with JavaScript enabled